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31	Interdisciplinary Geosciences	ABS-43
Decreasing in Slope Stability Due to Toll Road Vibration as Observed based on Geometric and Physical Parametersy to Submit This Sample Abstract Vera Sadarviana, Brian Bramanto, M. Gamal, Daniel A. Tampubolon, Rahmadi Hilmafizar, Reyhan Akbar, Hana Alfiyanti., Muhammad Tezar, Muhammad F Muttaqint Try to Submit This Sample Abstract Geodesy Research Group, Faculty of Earth Sciences and Technology , Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132, West Java, INDONESIA Abstract The construction of a toll road that divides mountains or hills provides two benefits, a beautiful scenery and the shortest distance to destination. The slope that is formed must remain stable so that it is safe for road traffic. Roads with dense vehicles and even traffic jams will cause vibrations that are repeated and continuous. The vehicle vibration on the highway caused by vehicles number, weight or type, driving speed and the road roughness. The magnitude of vehicle vibration on the slope material depends on the distance and resistance of the slope. Physically, the vibration effect dependent on the geological structure of hills formation, and meteorological i.e temperature, rainfall intensity, land cover and gravity as displacement potential. Geometrically, an indication of slope stability disturbance is shown by the presence of displacement slope material. GPS observations provide simultaneous material movement with the magnitude of the vibration. Dynamic model and spatial analysis provide slope stability decreasing information for be used as early warning. Keywords: vibration, slope stability, geometric, dynamic, spatial Share Link | Plain Format | Corresponding Author (Vera Sadarviana)

32	Interdisciplinary Geosciences	ABS-44
Water Quality Assessment of Lake Maninjau After the Mass Fish Kill Event Taofik Jasalesmana(a*, d), Sulung Nomosatryo(d), Ira Akhdiana(d), Mutiara Rachmat Putri(b), Mirzam Abdurrachman(c), Cynthia Henny(d) a) Earth Science Doctor Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Bandung, Indonesia *t.jasalesmana[at]gmail.com b) Research Group of Oceanography, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Bandung, Indonesia c)Geological Engineering Study Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Bandung, Indonesia d)Research Center for Limnology and Water Resources, National Research and Innovation Agency (BRIN), Cibinong 16911, West Java, Indonesia Abstract Mass fish kill is often occurring in Lake Maninjau. A decreased oxygen content has reportedly resulted in many fish kills, including the lake Maninjau condition recently. Deoxygenation of lake water is a natural phenomenon that often occurs after heavy rain events and low sunlight intensity. In addition, the decrease in oxygen chemically is triggered by the rise of sulfide from the bottom layer of the water column when the wind blows hard over a long period. Furthermore, this study examines water quality parameters after mass fish mortality occurred across locations in Lake Maninjau. Field surveys were conducted by measuring psychochemical parameters and total sulfide on the five of the middle and ten points around of the lake from 26 November - 02 December. They were measured directly using the HORIBA water quality checker (WQC), DO meter YSI ProDO and the HACH spectrophotometer DR3900 method. The results showed that DO levels at each observation point averaged close to 0 mg/L with an average sulfide level on the surface of 21.5 micro g/L. The average Oxidation Reduction Potential (ORP) of -79.26 mV indicates that the lake is in a reduced state and signifies that a lot of dead and decaying material in the water cannot be cleared or decomposed. Low ORP values indicate that the compound in the water is available in reduced form, which is more toxic. Our productivity primer experiment showed that sunlight intensity is effective in increasing oxygen concentration in the lake. Keywords: Dissolved oxygen, fish death, Lake Maninjau, sulfide. Share Link | Plain Format | Corresponding Author (Taofik Jaslesmana)

33	Interdisciplinary Geosciences	ABS-47
Circular Particle Chuting in Salted Water Column Simulation Adnya Pratiwi*, Mutiara Rachmat Putri, Rima Rachmayani Doctorate Program in Earth Sciences, Faculty of Earth Sciences and Technologies, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia *adnya.priscilla[at]gmail.com Abstract In marine sediment sample treatment, the homogenization process usually done prior to marine sediment sample analysis in order to get an average result of chemical composition contained in the sample. This is a necessary step because the particles do not sink in a straight direction from the surface. The density of the particle and the density of the water column change the direction of sinking particle, make the particles distributed unevenly throughout the sea bed. In a paleoclimatology and paleoceanography study where the layers of sediment in the core are being dated to decipher the succession of environmental event, the uneven vertical distribution of particles in the sediment core could pose a bias in the data interpretation. Even though the bias is reduced by the homogenization process during sample treatment, it is unclear as to how the particle ^chuting^ in the water column and how significant is the uneven particle distribution in the seabed affecting marine sediment data interpretation. This study aims to investigate numerically how the particles of different density settle in the water column of certain density based on Immersed Boundary-Lattice Boltzmann method to solve the fluid-particles interaction problem. We will also look at the distribution of particles settled on the base floor under the present of current in the water column. We assume the particle form as a circular form. The result from this study may accompany the interpretation of marine sediment data. Keywords: Sedimentation- Immersed Boundary-Lattice Boltzmann Share Link | Plain Format | Corresponding Author (Adnya Priscilla Prita Pratiwi)

34	Interdisciplinary Geosciences	ABS-50
GLOBAL TRENDS RESEARCH ON METALLOGENY IN MAFIC-ULTRAMAFIC ROCKS: A BIBLIOMETRIC APPROACH Jakah (a*), Ernowo (a), A A Kausar (a), H Permana (a), I T Susanto (b), D N Sunuhadi (b) 1. Research Centre for Geological Resources, National Research and Innovation Agency LIPI Bandung Area (BRIN Bandung-Cisitu), Sangkuriang St, Coblong, Bandung City, West Java 40135 *jaka005[at]brin.go.id 2. Indo Minerals Research Dangdeur, Bungursari, Purwakarta Regency, West Java 41181 Abstract A comprehensive assessment and evaluation of research on metallogenic in mafic-ultramafic rocks have yet to be found, which is essential in determining the novelty value and direction of future research. This research aims to determine the development and research opportunities related to metallogenic in mafic-ultramafic rocks using bibliometric methods based on the SCOPUS database, visualized and analyzed using VOSviewer. The results show a total of 915 publications from 1969-2021 with the highest contributing countries being China and Australia, while the Chinese Academy of Sciences is the most productive affiliate. Ore Geology Reviews is the journal with the highest publication, while the most productive author is Mao J. The subject area is dominated by Earth and Planetary Sciences and the few are multidisciplinary, energy, social sciences, chemistry, and mathematics. Recent trends in research topics include petrogenesis, geochemistry, geochronology, and fluid inclusions. Research topics with low frequency include ophiolite complex, ore-forming processes, Cu-Au deposit, Mo-Cu mineralization, Petro-geochemistry, Rb-Sr geochronology, Re-Os analysis, uranium minerals, ilmenite, monazite Sm-Nd isotope, sphene, Sr-Nd-Pb-Hf isotope, zircon U-Pb, modeling, orogenic area, dunite-peridotite-pyroxenite-gabbro-association, and gabbroid. Keywords: bibliometric analysis, geo-research map, geo-research gap, metallogeny mafic-ultramafic Share Link | Plain Format | Corresponding Author (Andrie Al Kausar)

35	Interdisciplinary Geosciences	ABS-51
Cianjur Earthquake- Roles of Social Media and the Distribution of Sciences Alfend Rudyawan (*), Astyka Pamumpuni, Mika Rizki Puspaningrum, Indra Gunawan, Benyamin Sapiie, Alfita Puspa Handayani, Mirzam Abdurrachman Fakultas Ilmu dan Teknologi Kebumian, Institut Teknologi Bandung (*) alfend[at]itb.ac.id Abstract A magnitude 5.2 earthquake hit Cianjur Regency, West Java, Indonesia on November 21, 2022, killing more than 300 people, leaving many more missing, 100,000 people, and damaging more than 60,000 houses. Historically, earthquakes in this region have been cataloged since the late 17th century. Significant seismic activity was recognized in 1699, 1834, 1879, and 1900 near Cianjur in West Java. After the news spread, several analyzes were published claiming that the Cimandiri fault must have caused the quake. However, the epicenter was about 12 km north of the estimated location of the Cimandiri Fault. The news quickly hit social media, with some responding in group chats, feeds, reels, and reviews of the literature shared via other social media. Moreover, others were featured in webinars and on national television. However, this information was based solely on limited information and prior knowledge of the area without further analysis of the actual data. New satellite data was uploaded via social media a few days later. This update soon reduced online discussion about the Cimandiri Fault. There was further evidence of a previously buried fault between the Cimandiri Fault and the Gede Pangrango Range. Our field observations indicate that this fault caused most of the rupture in this region. Socially, the earthquake event also caused immediate problems in the local community. There have been incidents of earthquake survivors, donors, and people taking advantage of the situation. Blockades were everywhere, and those claiming to be survivors demanded that oncoming donation boats be stopped and all donations abandoned. Having failed and knowing they were being recorded, they forced the fleet to turn back. These incidents have hampered efforts to distribute aid to the most remote areas. As a result, survivors who had taken refuge far from major logistical lines were left stranded. There were traffic jams everywhere as everyone wanted to make their donations. Also, people post a lot of content on social media very quickly. Heartless selfies and video content created in the face of grieving communities are everywhere. This behavior has also created a rift between survivors and donors. Even after the government set up a disaster relief base, the problem did not immediately disappear. Logistics are in excess, but they still need to reach the most remote communities. The recent Cianjur earthquake has taught us how important it is to know the geological phenomena behind our own homes. The earthquake was our real test. A catastrophe has happened before our eyes, but we still cannot foresee it, and our community needs to be ready to become resilient. Low-tech solutions such as education and disaster training should be widely implemented in communities so that they are ready whenever disaster strikes. Keywords: Cianjur, Earthquake, Social Media Share Link | Plain Format | Corresponding Author (Alfend Rudyawan)

36	Interdisciplinary Geosciences	ABS-60
PETROGENESIS OF QUARTZ IN SOME POTENTIAL HIGH PURITY QUARTZ DEPOSITS IN MAIN ISLAND OF SUMATRA, BANGKA AND BELITUNG ISLANDS AND RIAU ARCHIPELAGO A.S. Subandrio (a), M.I. Agadinata (b), V. Susanto (a) and I.A. Kurniawan (a) (a) Prodi Teknik Geologi - FITB - ITB (b) Independent Geologist Abstract High Purity Quartz (HPQ) is one of the most abundant minerals in the Earth^s crust and the most important silica mineral, occurring in large amounts in igneous, metamorphic and sedimentary rocks. The demand for the raw material quartz is increasing worldwide, in particular, the demand for high-purity quartz. Therefore, high purity quartz has become one of today^s key strategic raw materials for the high-tech industry. It can be used either for high added value applications such as silicon-metal wafers , optical glass or solar cells of PV panels. HPQ for advanced high-tech applications is currently sourced from just a few locations around the world. Such is the expected growth in demand that more sources are required to be found. For successful raw HPQ resources identification detailed analysis and appropriate process technology selection is essential. This paper reviews general aspects of HPQ deposits, exploration requirements, quality evaluation of raw quartz, and provides basic insight into the different specifications and market developments of the hightech end-user industries reliant on very high purity refined quartz products. Intensive exploration work in area of main island of Sumatra, islands of Bangka and Belitung as well as Riau Archipelago resulted in the identification of medium to high purity quartz vein and sand of beach and river deposits. This research examines the origin of quartz-rich sands, documents the range of environments in which they are found and suggests a model for their genesis in islands of Sumatra, Bangka and Riau Archipelago. Cretaceous quartz arenites are a very common geological feature on the southeastern part of Riau Archipelago. Provenance analysis and study of weathering effects was done for Cretaceous sandstone from south-eastern Riau Archipelago, including Singkep island. In this study we distinguish different quartz types by XRF analyses combined with standard optical petrography on the on vein, sandstone and quartz sand. This is done on a suite of samples collected from beach sand and sinclinal basin of the Sebangka island. Our results show that the quartz sand were derived from local Cretaceous sandstone source rocks, whereas quartz sand of Sibolga area may have been derived from local source of Triassic plutone of Sibolga Granitoid Complex. This study also highlights the importance of understanding alteration processes of acid plutonic rocks that affecting the deposits from source to sink, and to be careful to describe quartz-rich rocks as simply recycled deposits. The mineralogical characterization of Sibolga beach sand suggested that the powder quartz deposit was formed by long-term weathering of feldspathic or felsic rocks, possible of pegmatitic origin associated with Triassic Sibolga granitoid rocks. The main chemical impurities of Pasaman quartz vein are Al (30-1400ppm), K(100-3000 ppm), Fe (100-1100 ppm), Na (200-600 ppm), Ca (20-600 ppm), and Ti (15- 110 ppm). All the samples from deposits under this study meet the requirements of the HPQ definition and they are thus high purity quartz deposits. The petrologic analyses of 13 thin sections from two location in Sebangka and Sirai islands allowed the identification of primary composition and diagenetic patterns of Semarung Formation. The original detrital compositions included arenite, and lithic sandstones. The discovery of some potential HPQ deposit in Sumatra, Bangka and Riau Archipelago, together with a better knowledge of the processes leading to the formation of HPQ in pegmatitic veins and arenitic sandstone, could lead to the recognition of a Indonesian type of HPQ resourcse applicable for industrial use. Beneficiation study on these deposits is recommended to establish possible industrial applications that may be feasible. Keywords: High purity quartz, Sumatra, Bangka, Riau archipelago, national Share Link | Plain Format | Corresponding Author (Andri Slamet Subandrio Subandrio)

37	Interdisciplinary Geosciences	ABS-61
Use of Landsat 8 Satellite Imagery, DEM, and Gravity to Identify Geothermal Sources in Kamojang, Garut and Surrounding Areas a) Farhan Abdurrohman- b) Yuliana Susilowati - c) Aang Gunawan Sutyawan - d) Wawan Hendriawan - e) Yugo Kumoro - f) Ratih Dewanti - g) Muhamad Ananda Pahlevi - h) Ryandra Satya Dharmawan a) Geological Engineering, Faculty of Engineering Jenderal Soedirman University Purbalingga, Indonesia farhan.abdurrohman[at]mhs.unsoed.ac.id b) Research Center for Climate and Atmospheric National Research and Innovation Agency Bandung, Indonesia yuli006[at]brin.go.id c) Research Center for Data and Information Sciences National Research an Innovation Agency Bandung, Indonesia aang003[at]brin.go.id d) Research Center for Data and Information Sciences National Research an Innovation Agency Bandung, Indonesia wawa020[at]brin.go.id e) Research Center for Geological Disaster National Research an Innovation Agency Bandung, Indonesia yugo001[at]brin.go.id f) Research Center for Remote Sensing National Research and Innovation Agency Bandung, Indonesia rati001[at]brin.go.id g) Petroleum Engineering, Faculty of Engineering University of Jember Jember, Indonesia m.anandapahlevi[at]gmail.com h) Petroleum Engineering, Faculty of Engineering University of Jember Jember, Indonesia ryandrasatyadharmawan06[at]gmail.com Abstract As a country in the middle volcanic belt of the world, Indonesia has a geothermal potential of around 23,965 GW. This amount is enormous compared to the power plants that have been installed in several regions in Indonesia. In this study, we identified the characteristics of the Kamojang Region, which have been proven to have geothermal resources and have been produced for later these characteristics to be applied in other areas. The parameters that we use in identifying this geothermal feature are the Land Surface Temperature Map, the Normalized Difference Vegetation Index, Composite Bands 5, 6, 7 derived from Landsat 8 data, and the Bouguer Anomaly Map derived from gravity data. Based on this study, it can be concluded that areas with high geothermal potential has surface temperatures above 21.69 degrees Celsius, NDVI values above 0.319 (medium green), there are geological structures, geothermal manifestations and Bouguer Anomaly values less than 200. Areas with medium geothermal potential has surface temperatures between 20.27 - 21.68 degrees Celsius, NDVI values between 0.23 - 0.318 (low - medium green), there are geological structures, and Bouguer Anomaly values between 200 - 240. Areas with low geothermal energy has a surface temperature of less than 20.26 degrees Celsius, an NDVI value of less than 0.22 (low greenness), no geological structures or geothermal manifestations and a Bouguer anomaly value of more than 240. But it should also be remembered that the LST Map and NDVI has a high degree of ambiguity, especially in tropical areas like Indonesia. Keywords: Geothermal- Land Surface Temperature- Normalized Difference Vegetation Index- Fracture- Bouguer Anomaly- Landsat-8- Power plant Share Link | Plain Format | Corresponding Author (Farhan Abdurrohman)

38	Interdisciplinary Geosciences	ABS-68
The Impact of Environmental, Social, and Economic Factors Due to Anak Krakatau Volcano Tsunami Using Remote Sensing Technology Riantini Virtriana (a,b), Agung Budi Harto (a,b), Pitri Rohayani (b), Tania Septi Anggraini (c), and Kalingga Titon Nur Ihsan (c) (a) Remote Sensing and GIS Research Group, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Indonesia. (b) Department of Geodesy and Geomatics Engineering, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia. (c) Doctoral Program of Geodesy and Geomatics Engineering, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia. Abstract The territory of Indonesia often occurs tsunamis because its widely traversed by encounters between earth plates in the sea, so if an earthquake occurs, it has the potential for a tsunami. Indonesian region is also located in the ring of the fire area, which ranks first as the country with the highest number of active volcanoes, more than 127 event, that can encourage volcanic earthquakes. In addition, when volcanoes erupt in the offshore, the potential for a tsunami will be even greater because the vomit of material can landslide towards the sea, causing a tsunami. The tsunami happened in the eruption of Anak Krakatau on December 22, 2018, in the Sunda Strait, which resulted in a tsunami in the Lampung and Banten areas. This study tries to compare environmental, social, and economic factors before and after the tsunami in the coastal areas of Lampung and Banten. The integration of remote sensing data will be carried out to determine environmental, social, and economic factors such as Land Cover, NDWI, NDVI, Night Light, and NO2 data. Random Forest Machine Learning will also be involved in shaping land cover models. Random Forest is often used because it has a good accuracy. The results show a significant change in land cover in coastal areas and the impact of environmental, social, and economic factors. This study is expected to support the mitigation process in the event of a tsunami in the future. In addition, it is expected to be used by policymakers in planning development after the tsunami disaster. Keywords: Volcano Tsunami- Remote Sensing- Random Forest- Environmental Factor Share Link | Plain Format | Corresponding Author (Pitri Rohayani)

39	Interdisciplinary Geosciences	ABS-69
Prediction of Land Subsidence on The North Coast of West Java in 2017-2021 Based on DInSAR Data Arin Afina Sulia (1) and Dian Noor Handiani (1) 1) Deparment of Geodetic Engineering, Faculty of Civil Engineering and Planning, Institut Teknologi Nasional, Jl. PH.H. Mustofa No.23, Bandung 40124, Indonesia Abstract Land subsidence is a geological phenomenon causing downward land displacement relative to the reference point of the ground^s surface. The impact of land subsidence can threaten the environment, such as damaging infrastructures and buildings, performing soil cracks, and increasing flood risk. These conditions are threatening community settlement and their economic activities. This study aims to map and calculate how large land subsidence is on the North Coast of West Java using the Differential Interferometry Synthetic Aperture Radar (DInSAR) method. The study uses Sentinel-1 data in the years 2017, 2018, and 2021 and the digital elevation model (DEM) of the Shuttle Radar Topography Mission (SRTM). The results show that land subsidence changes from the year 2017 to 2018 were up to 0.18 m/year, and it occurs in Cirebon Regency (Losari District), also Indramayu Regency (Pakisjaya District). Meanwhile, land subsidence changes from the year 2017 to 2021 were up to 0.15 m/year, and it occurs in Tempuran District in Karawang Regency. Compared to previous studies, we found that the North Coast of West Java area has experienced an increase in land subsidence, especially in Subang, Bekasi, Cirebon, and Indramayu Regencies. Hopefully, these results can help the local government and related agencies in developing an appropriate mitigation plan for land subsidence on the North Coast of West Java. Keywords: North Coast of West Java, Land Subsidence, DInSAR, Sentinel-1 Share Link | Plain Format | Corresponding Author (Arin Afina Sulia)

40	Interdisciplinary Geosciences	ABS-73
Acoustic Impedance Inversion Method to Determine Carbonate Reservoir Distribution of South Makassar Strait Basin Muhammad Alfan Bani Herdiaman (a*), Tumpal Bernhard Nainggolan (b), Eddy Supriyana (a) (a) Department of Geophysics, Padjadjaran University, Jl. Raya Bandung Sumedang Km. 21, Jatinangor, 45363, Indonesia *alfanbaniherdiaman[at]gmail.com (b) Research Center for Geological Resources, National Research and Innovation Agency, Jl. Sangkuriang 21, Bandung, 40135, Indonesia Abstract The South Makassar Strait Basin is considered as a basin that has potential hydrocarbon reserves in eastern Indonesia, since it is adjacent to Sebuku Block, a giant oil and gas field. Some of the most productive hydrocarbon reservoirs have come from carbonate build-up in shallow marine, but in this area, carbonate build up has been found on deep marine. Carbonate rocks in this basin are aged from Miocene-Oligocene of Berai Formation. This study aims to obtain distribution of carbonate build-up reservoir and to prove the existence of petroleum system of South Makassar Strait Basin. Acoustic Impedance (AI) inversion method was carried out to obtain information on the distribution of carbonate reservoirs with marine 2D seismic post-stack time migration and Sultan-1 and Kris-1 wells. Target zone as carbonate reservoirs are determined at 3133-3523 m on Sultan-1 well and 3651-to 3773 m on Kris-1 well. Based on analysis, Sultan-1 well shows gas column with gas water contact but Kris-1 well shows no hydrocarbon on Berai Formation carbonate reservoirs. Both wells show the development of complex carbonate build-up in the neritic zone environment. In Oligocene period, rifting process of South Makassar Strait has stopped and has transformed into steady and calm phase. The Berai Formation model shows environmental changes laterally northwest-southeast of the platform from reef facies to the submarine basin and basinal plain facies. Keywords: Carbonate reservoir- Acoustic impedance inversion- Petroleum system- South Makassar Strait Basin Share Link | Plain Format | Corresponding Author (Muhammad Alfan Bani Herdiaman)

41	Interdisciplinary Geosciences	ABS-74
GITBoLA v.1.1: a New Spatial Planning Decision Tools For Green Infrastructure Technology in Urban Areas Lius Lisanyoto (a*), Agustinus Bambang Setyadji (b), Vera Sadarviana (b) a) Master Student in Geodesy and Geomatics Engineering, Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *Liuslisanyoto[at]gmail.com b) Geodesy Research Group, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia Jalan Ganesha 10, Bandung 40132, Indonesia Abstract Building infrastructure in urban areas is a part of regional development, and that indicates the areas are growing. In other hand, it will involve to the water management system, especially urban stormwater. As one solution to this, green infrastructure was designed to help urban stormwater management. Implementation of green infrastructure technology in urban areas is to maximize on-site storm water control. Determining the suitable location of green technology is important for urban space optimization and for the technical requirements for green technology itself. Therefore, Green Infrastructure Technology Based on Location Analysis version 1.1 (GITBoLA v.1.1) tool is developed for selecting green infrastructure technology using a multi criteria concept in GIS software (ArcGIS 10.x). GITBoLA v.1.1 is designed by a model builder in ArcGIS and arranged by 10 parameters and consists of 13 processes from input to output. The result of GITBoLA v.1.1 is a green infrastructure technology suitability map. In this study, data from Cibinong Situ Front City was used to commission GITBoLA v.1.1 in some devices with some version of ArcGIS. The result show that GITBoLA v.1.1 was running well and finally, this study will introduce new tools for spatial planning decision support systems for developing green infrastructure technology. Keywords: GITBoLA v.1.1- Green Infrastructure Technology- Location- Multi Criteria Share Link | Plain Format | Corresponding Author (Lius Lisanyoto)

42	Interdisciplinary Geosciences	ABS-75
Identification and Characterization of Gas Hydrate using Marine Seismic and Well Data: South Makassar Strait case study Ahmad Wadi Muntashir (a*), Tumpal Bernhard Nainggolan (b), Eddy Supriyana (a) a) Department of Geophysics, Padjadjaran University, Jl. Raya Bandung Sumedang Km. 21, Jatinangor, 45363, Indonesia *rvrclm[at]gmail.com b) Research Center for Geological Resources, National Research and Innovation Agency, Jl. Sangkuriang 21, Bandung, 40135, Indonesia Abstract Gas hydrate holds significant potential resource as a non-conventional alternative to current oil and gas resources. It is composed of gas molecules that is formed in sub-seabed layer characterized by high pressure and low temperature. The appearance of bottom simulating reflector (BSR) is the main indicator for the presence of gas hydrate during the seismic interpretation process. However, there is no significant study to determine distribution of gas hydrate-bearing sediments using post-stack time migration seismic data and well data on South Makassar Strait. Therefore, in this study, three seismic sections South Makassar Strait is analyzed, characterized and interpreted to determine distribution of gas hydrate by the presence of high amplitude, reversed polarity reflection, cross-cut reflection and cross-over density and porosity logs of sedimentary layer. This study uses three lines of 2D marine seismic post-stack time migration CM02-57, SM93-06 and SM93-08 and Kris-1 well. Based on the results, gas hydrates are indicated in three seismic lines. There are two areas on line CM02-57 identified with bottom simulating reflector and cross-over density and porosity logs, firstly CDP range of 7592-8311 on time depth 2700-2800 ms, and CDP range of 9832-10152 on time depth 2400-2500 ms. Line SM93-06 shows gas hydrate at CDP range of 4783-5762 on time depth 2900-3000 ms. Both lines are correlated with line SM93-08, which shows gas hydrate CDP range of 4119-4992 on time depth 2900-3000 ms. Those three lines indicates good distribution of gas hydrate potential on South Makassar Strait area. Keywords: gas hydrate- bottom simulating reflector- post-stack time migration- South Makassar Strait Share Link | Plain Format | Corresponding Author (Ahmad Wadi Muntashir)

43	Interdisciplinary Geosciences	ABS-80
Carbon Emissions Prediction from Land Change Model in Bandung Regency, Indonesia Ira Indrarini (a*), Dian Noor Handiani (a) a) Geodetic Engineering, Faculty of Civil Engineering and Planning, Institut Teknologi Nasional Bandung *indrariniira[at]gmail.com Abstract Carbon emissions in Bandung Regency is potentially increasing and can harm future environment in the area. Our study aims to predict carbon emissions in Bandung Regency based on land changes model of the area. We utilized Cellular Automata Markov method which predicted land use in the years of 2027 and 2036. This land use prediction used overlay intersect method and were analysed using two scenarios: backward and forward looking. The backward looking scenario analysis combined the land used map of 2019 and two land use maps prediction of 2027 and 2036. Meanwhile, the forward looking scenario analysis combined the land used map of 2019 and the urban planning plan of Bandung Regency in the years of 2016 to 2036. Carbon emission were calculate using stock difference method for both scenarios. Afterwards, the carbon emission results were classified using quartile method. The result in the backward scenario showed that the carbon emission is dominated compare to sequestration, with total emission of 811330.81 tonnes of \(CO_{2}^{eq}\) for the years of 2019 to 2027 and 998288.22 tonnes of \(CO_{2}^{eq}\) for the years of 2019 to 2036. In the forward looking scenario, carbon sequestration is dominated compare to emission, with highest sequestration around -804125.22 tonnes of \(CO_{2}^{eq}\), while highest emission is around 245506.51 tonnes \(CO_{2}^{eq}\). Overall, both simulation showed that the highest emission occurs in Cilengkrang-Cimenyan development area, and the carbon sequestration occurs in Baleendah, Cileunyi-Rancaekek, and Margahayu-Margaasih development areas. Keywords: Carbon Emissions, Land Change, Spatial Modelling, Bandung Regency Share Link | Plain Format | Corresponding Author (Ira Indrarini)

44	Interdisciplinary Geosciences	ABS-81
Geotrail Characterization based on Regional Geological History in the Unesco Global Geopark Ijen, East Java Abdillah Baraas1,2, Mirzam Abdurracman2 1 Geological Engineering, Bandung Institute Of Technology 2 Ijen Aspiring UNESCO Global Geopark, East Java, Indonesia Abstract Ijen Geopark is one of the national-scale geoparks in East Java Province, precisely in Banyuwangi and Bondowoso Regency. The geological history of the Ijen Geopark began during the Oligocene-Miocene, which was marked by outcrops and hills from the volcano in the south of the geopark area due to the subduction of the Indo-Australian Plate to the Beneath Plate. About five million years ago these mountains had died, then due to changing of subduction^s, volcanoes were formed which are now to the north as far as fifty kilometers from their initial position. There are several mountains that are formed in the north, such as Mount Baluran, Mount Ringgit, Complex Ijen Purba, until the youngest is Mount Raung. The evolution of tertiary volcanoes that once lived in the south and then was replaced with quarter volcanoes in the north becomes an interesting story when the journey is uncovered by geochemical data from product samples resulting from eruptions that have ever existed. The results of geochemical samples with a variety of constituent elements are the key to revealing the evolutionary history of volcanoes in this area. Of course, this travel story can be used as geotourism material for the history of the volcano that underlies the Ijen Geopark which is being proposed to become a UNESCO Global Geopark by the Government of Indonesia Keywords: Volcano, Ijen Geopark, Geotrail, Geotourism Share Link | Plain Format | Corresponding Author (Abdillah Baraas)

45	Interdisciplinary Geosciences	ABS-86
An Enhanced Earthquake Risk Assessment Methodology using H3 Spatial Indexing (Case Study: Sorong City) Atik Nurul Aini (a,b*), Dewa Putu Adikarma Mandala (a), Mizan Bustanul Fuady Bisri (a,c) a) Cerdas Antisipasi Risiko bencana (CARI! bencana) Jalan Sepak Bola 5, Bandung 40293, Indonesia *atiknurulaini[at]students.itb.ac.id b) Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia c) GSICS, Kobe University, Kobe, Japan 2-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan Abstract Risk assessment is the first step in disaster risk reduction in general and becomes even more important for types of disasters with potentially significant impacts such as earthquakes. Besides the direct impact of very devastating shocks, earthquakes can also trigger disasters that are no less damaging such as landslides, liquefaction, and tsunamis. This study aims to apply the H3 spatial indexing system to improve earthquake risk assessment using Sorong City as a case study, and compare the result of risk assessment using H3 and the usual risk assessment in Indonesia. On September 24, 2015, Sorong City was rocked by an earthquake that left dozens of victims injured and hundreds of houses damaged. H3 is a geospatial indexing system developed and open sourced by Uber. It uses hexagons in its indexing in its calculation and visualization, which are hierarchical and global. In a hexagon, all neighbors are equidistant and have the property of expanding neighboring rings that are close to a circle, also filling space optimally. On average, a polygon can be filled with hexagon tiles with a smaller margin of error than square tiles. The H3 spatial index is used in earthquake hazard, vulnerability, capacity, and risk assessment systems. The value of each parameter is entered into each hexagon so that in the end each hexagon has its risk index value. The study shows that the use of H3 in earthquake risk assessment can provide a more detailed level of analysis and indirectly does not depend on regional administrative boundaries. Technically, this advantage provides a more efficient calculation method and is also easier to modify partially both spatially and in terms of the parameters used. Based on the performance evaluation results on the spatial join aspect, H3 provides much faster performance compared to traditional indexing systems. Hence, the H3 spatial index will be very useful to meet the need for an earthquake risk assessment on a larger scale with a higher level of resolution. Keywords: h3 spatial index- risk assessment- earthquake Share Link | Plain Format | Corresponding Author (Atik Nurul Aini)

46	Interdisciplinary Geosciences	ABS-89
Geochemical Characteristics of Lacustrine Source Rock: An Insight of Banuwati Formation from Offshore Sunda and Asri Basins, Indonesia Bagus Priyanto (a*), Eddy A. Subroto (b), Asep H.P. Kesumajana (b), Agus D. Suryanto (c), Very Susanto (b) a) Doctoral Program in Geological Engineering, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jl. Ganesha, 10, Bandung, 40132, Jawa Barat, Indonesia *32020001[at]mahasiswa.itb.ac.id b) Department of Geological Engineering, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jl. Ganesha, 10, Bandung, 40132, Jawa Barat, Indonesia c) Pertamina EP, Standard Chartered Tower, Floor 21-29, Jl. Prof. Dr. Satrio, 164, Jakarta, 12950 Indonesia Abstract The Sunda and Asri Basins are petroliferous in Indonesia. Although the two basins have produced billions of barrels of oil equivalent since the beginning of their production, the study of source rock organic geochemistry on those basins is relatively limited, especially on the sapropelic kerogen of the syn-rift package of Banuwati Formation. The organic geochemistry study of the Banuwati Formation in Sunda and Asri Basins was determined in a comprehensive study based on kerogen and biomarker data. The data were obtained by using some techniques, including carbon analyzer, Rock-Eval pyrolysis, gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), and organic petrography analyses from five wells. The Banuwati Formation has good to very good source rock quality and quantity. The biomarker analysis reveals a new novelty interpretation that Banuwati shale source rock has been deposited in an oxic-suboxic setting. The Banuwati Formation dominantly consists of Type I organic material with some characteristics such as the presence of uncommon biomarkers, e.g. C26 tricyclic terpane and an indication of botryococcane peak which strongly indicates a lacustrine environment. In terms of maturity, there is a different result between Ro and Tmax. Tmax values indicate the formation is mature, but based on Ro it seems immature. This phenomenon was most likely due to Ro suppression that often happens in the Type I kerogen samples. Keywords: Source rock- Banuwati Formation- biomarker- lacustrine- Sunda and Asri Basins Share Link | Plain Format | Corresponding Author (Bagus Priyanto)

47	Interdisciplinary Geosciences	ABS-90
Surface Geology Research and Data Analysis on Fault Creeping and Overpressure Relationship in Onshore North East Java Basin Eri Sarmantua Sitinjak, Benyamin Sapiie, Agus M. Ramdhan Department Geology of Institut Teknologi Bandung Abstract The North East Java Basin is one of the most important oil and gas basin in Indonesia. There are many manifestations of oil seeps, mud volcanoes and it is surrounded by active faults. The activity of Kendeng Fault and its relationship to overpressure and earthquake potential which will impact the oil and gas exploration or natural disaster mitigation in onshore North East Java Basin is still a question for many researchers. Therefore, a study on the quantification of fault activity and surface modelling is necessary to be done in this area, especially on fault creeping. This paper will focus on surface geological mapping data and surface modelling result based on InSAR data in defining the fault creeping and overpressure manifestation. Continues research on fault creeping has been started since 1960 in the San Andreas fault, United States. There is no continues research on fault creeping in onshore North East Java Basin or Kendeng Basin till now. The North East Java Basin or Kendeng Basin area, where many active mud volcano manifestations exist till today, is known as an area that is indeed dominated by marl and clay lithology. It is a warm basin, overpressure and an ideal environment for fault creeping to occur. We took fluid, gas, and mud samples from the mud volcanoes for laboratory analysis in order to support our justification. Diversity in its composition may be possible related to Kendeng fault activity. As most of the mud volcano manifestations in North East Java Basin or Kendeng Basin are located close to the Kendeng Fault and also related to faults as conduit to erupt to surface. From the InSAR surface modelling, we observed that there are some velocity anomalies in onshore North East Java Basin especially surround Kendeng Fault Zone. Some surface features that we suspected as a result of fault creeping were investigated and delivered in this paper. Based on this assessment we concluded that the fault creeping in onshore North East Java Basin or Kendeng Basin exist and has relationship to the overpressure manifestations in the region. The results of this research can be used for the development of oil and gas fields as well as mitigation of natural disasters that may occur related to oil and gas exploration or earthquakes. Keywords: fault creep, mud volcano, earthquake, overpressure Share Link | Plain Format | Corresponding Author (Eri Sarmantua Sitinjak)

48	Interdisciplinary Geosciences	ABS-92
A Preliminary Study of Vegetation in Indonesia mud volcanoes and its relationship to the geology Eri Sarmantua Sitinjak, Benyamin Sapiie, Agus M. Ramdhan Department of Geological Engineering, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung Abstract Since the eruption of the famous Lumpur Sidoarjo in 2006, the study of mud volcano in Indonesia is growing very fast. Mostly the research focus on the mud volcano in onshore North East Java Basin and Kendeng Basin in East and Central Java, extend from Sidoarjo to Salatiga. Nevertheless, other mud volcanoes also present in Sukabumi, West Java (Ciuyah Mud Volcano), in Madura Island (Soccah or Bujel Tasek Mud Volcano), in East Nusa Tenggara (Napan and Pulau Semau), and some are in offshore Madura strait. There has been no initial comprehensive study about the vegetation around mud volcanoes in Indonesia till now, nor has its relationship with geology of the mud volcano. This paper is a preliminary approach of summarizing the documented vegetation around mud volcanoes in Indonesia. It is hoped that this research will motivate other researchers in Indonesia to dig deeper or enhance this study. This research was done by doing field mapping visiting all the possible mud volcanoes manifestation in onshore Java and Madura Island, extend from Sukabumi to Madura. The samples from the mud volcano including the fluid, gas, mud and vegetation were collected and sent to the dedicated laboratory for deeper analysis. The chosen vegetations are those which is growing at the center and exactly at the periphery mud volcano. This is done to see the impact of the mud volcano material to the vegetation. We are sharing the laboratories result and the analysis in order the define the relationship to the geology, especially oil and gas exploration, natural disaster mitigation or the active Kendang thrust fault which located is nearby the mud volcanoes. The mud volcanoes were divided into active, less active and inactive mud volcano. We concluded that there is correlation between the vegetation and the activity of the mud volcanoes in Indonesia. Keywords: vegetation, mud volcano, fault, earthquake, overpressure Share Link | Plain Format | Corresponding Author (Eri Sarmantua Sitinjak)

49	Interdisciplinary Geosciences	ABS-93
Estimating Tsunami Economic Losses with Integrated Engineering-Economic Model and H3 Spatial Index (Case Study: Pangandaran Village and Pananjung Village, Indonesia) Atik Nurul Aini (a,b*), Wiwin Windupranata (c) a) Geodesy and Geomatics Engineering, Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *atiknurulaini[at]students.itb.ac.id b) Cerdas Antisipasi Risiko bencana (CARI! bencana) Jalan Sepak Bola 5, Bandung 40293, Indonesia c) Research Group of Hydrography, Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia Abstract Pangandaran Village and Pananjung Village (Pangandaran Regency, West Java) are tourist destinations with a thriving economy. This area has a history of earthquakes measuring Mw 7.7 in 2006 and according to recent research, belongs to an area with the potential for earthquakes measuring Mw 8.7-9, which can trigger an enormous tsunami. This study aims to estimate and analyze economic losses in Pangandaran Village and Pananjung Village. Economic approaches are needed to translate the potential impact of the tsunami into the monetary value of the damage across sectors. Estimates of economic losses can affect the decision-making process and the effectiveness of mitigation strategies. To calculate the value of economic losses, an integrated engineering-economic model that includes the Method of Splitting Tsunami (MOST) and Computable General Equilibrium (CGE) is applied in this study. This model uses detailed information on spatial heterogeneity in flood depth and economic activity. In the calculation of economic losses, the H3 spatial indexing system is utilized. H3 is an indexing system developed by Uber and is open source. H3 divides the world into hexagons and is hierarchical. The results of the study show that the economic losses due to the tsunami in Pangandaran Village and Pananjung Village are quite high. By using H3, the resulting analysis becomes more detailed and representative. The results of this research can be utilized by local governments in making decisions. Keywords: tsunami, economic losses, integrated engineering-economic model, h3 spatial index Share Link | Plain Format | Corresponding Author (Atik Nurul Aini)

50	Interdisciplinary Geosciences	ABS-95
Sustainable Engineered Cementitious Composite using Natural Sisal and Coir Fibers Patria Kusumaningrum (a*), Suranta Sembiring (b), Zaki Anwar F (c) (a,b,c) Civil Engineering Department, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology Jl. Ganesha 10 Bandung, 40132, Indonesia *patria.k[at]itb.ac.id Abstract Engineered Cementitious Concrete (ECC) or bendable concrete is a high-performance concrete (HPC) of high ductility characteristic. Generally, it has been used to strengthen or retrofit the existing structures to enhance the structural resilience against extreme loadings such as earthquake or blast. The constituent materials are fine aggregates, cement, supplementary cementitious composite (silica fume, fly ash, etc.), superplasticizer, water, and the use of fibers up to 2% volume fraction. With the use of fibers and elimination of coarse aggregate, ECC has deflection-hardening in bending and exhibit fiber-bridging by multiple cracking. However, the development of ECC has so far been limited using only synthetic and inorganic fibers which are scarse yet expensive in Indonesia. As Indonesia boasts the second highest level of biodiversity in the world as the source of natural fibers, in this research the natural fibers are used to replace synthetic and inorganic fibers in making ECC more sustainable, low cost yet locally available. Not only did the natural fibers are locally available with affordable price, the fibers also have distinctive characteristics of sustainable materials with high tensile strength and significant elongation. From the experiments, one may be concluded that natural fibers of sisal and coir can improve the ECC flexural strength up to 40% of the non fiber mix. This highlights its ability in replacing synthetic and inorganic fibers in ECC mixture. Keywords: ECC, natural fibers, sisal fiber, coil fiber, sustainable material, low cost, locally available, flexural strength, ductility Share Link | Plain Format | Corresponding Author (Patria Kusumaningrum)

51	Interdisciplinary Geosciences	ABS-96
Utilization of By-Products and Waste Materials from Steel Processing Industry to Produce Sustainable Green Pervious Concrete in Indonesia Patria Kusumaningrum (a*), Muhammad Risnan (b) (a,b) Civil Engineering Department, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology Jl. Ganesha 10 Bandung, 40132, Indonesia *patria.k[at]itb.ac.id Abstract Pervious concrete is a reliable solution for environmentally friendly concrete pavements, especially for densely populated urban areas. Some of the benefits of pervious concrete to the environment are mainly increasing the absorption of water into the soil, so that it can quickly purify rainwater runoff, recharge groundwater, reduce rainwater runoff, and when combined with well-designed drainage system it can minimize the potential of flooding. The uniqueness of this concrete is that it uses few or no fine aggregate at all, with the main composition consisting of coarse aggregate, binder (cementitious/pozzolanic materials), water and admixture. The development of pervious concrete with steel slag as raw material as coarse aggregate and GGBFS as a partial replacement for cement is carried out to address environmental problems caused by impervious pavement that is commonly used in urban areas, as well as to increase the added value of material by-products of the steel processing industry. The goal of this research is to obtain a mixture with a compressive strength of up to 28 MPa, the maximum value required by ACI 522-10R. From the experimental results, the compressive strength of pervious concrete on the 7th day reached 15.9 MPa to 25.4 MPa, therefore for 28 days strength of concrete it will have higher strength so that it can be categorized as High Strength Pervious Concrete. Such compressive strengths of pervious concrete have shown significant increase of 2-3 times higher than those of previous research regarding pervious concretes in ITB. Keywords: green pervious concrete, low cost, low carbon, high strength, permeability, void ratio Share Link | Plain Format | Corresponding Author (Patria Kusumaningrum)

52	Interdisciplinary Geosciences	ABS-97
Rapid assessment of river morphology changes using River Morphologic Stability Index (RMSI) and River Regime Concept, a case study of Plumbon River, Semarang City, Central Java Renaldy Andrean(a), Yadi Suryadi(a,b), Eka Oktariyanto Nugroho(a,b), Widharta Kusuma(a) Water Resources Management, Master Program, Bandung Institute of Technology(a), Water Resources Engineering Group, Civil Engineering Study Program, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology (b) renaldyandrean[at]gmail.com, yadisuryadi991[at]gmail.com, nugrohoeka[at]ftsl.itb.ac.id, widharta_kusuma[at]yahoo.com Abstract This paper presents a case study on assessing river morphology changes using two conceptual methods, River Morphologic Stability Index (RMSI) and River Regime Concept. The assessment for the case site, Plumbon River, is grouped into six sections based on its slope level. Slope level would become the main dependent variable in this study. RMSI is a rapid assessment tool used to characterize or evaluate either channel condition or channel stability. Five indexes^ methods of RMSI including CSI, OSEPI, CCSI, JSI, and PSI, are used in this study with parameters classification of: (a)Substrate type- (b)Channel geometry- (c)Streambank condition- (d)Stream condition- and (e)Artificial features. Parameters inside these indexes are analyzed through qualitative and quantitative analysis. River Regime Concept is a method to dimension a stable channel that has the quality to neither erode nor depose, thus indicating a channel with little potential of morphology changes. Three methods of River Regime Concept including Lacey, Blench, and Minimum Energy Concept, that rely heavily on parameters such as: (a)Channel Geometry- and (b)Stream Condition. Both methods are analyzed to present connection and combination as an initial step of providing a new rating index method for river with limited datas. Keywords: Plumbon River, River Morphologic, River Morphologic Stability Index, River Regime Concept Share Link | Plain Format | Corresponding Author (Renaldy Andrean)

53	Interdisciplinary Geosciences	ABS-99
Comparison of Gardner-Knopoff, Gruenthal, and Uhrhammer Earthquake Declustering Methods for PSHA in Aceh and the surrounding areas Juellyan (a,b), Bambang Setiawan (c*), Muttaqin (d) a) Master Student, Department of Civil Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia b) Awardee, Program Riset Unggulan Universitas Syiah Kuala Percepatan Doktor (PRUU-PD) Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM), Universitas Syiah Kuala *bambang.setiawan[at]unsyiah.ac.id c) Program Study of Geological Engineering, Department of Earths Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia d)Department of Civil Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia Abstract Earthquakes occur on the earth^s surface due to the sudden release of energy from within, which causes seismic waves. In seismology, the terms mainshock and foreshock are known. These terms describe earthquake events in two stages, the main earthquake stage and the seismic events after the main one. However, the earthquake data catalog generally does not separate the mainshock data and aftershocks. This separation is crucial for further research, i.e., modeling earthquake recurrence for Probabilistic Seismic Hazard Analysis. There are many methods to separate earthquake data based on mainshock and foreshock. This study uses three declustering methods: the Gardner-Knopoff method (1974), the Gruenthal method, and the Uhrhammer method (1986). The purpose of this study is to compare the three methods so that the results of which method show the highest a-value and b-value results for seismicity conditions in Aceh. The results obtained from this study are the Uhrhammer method (1986) with an a-value of 5.82, a b-value of 1.05, a total of 1893 main shock events, 305 clusters, and 3.3% of the total seismic moment released at that location. The Gruenthal method shows the results with an a-value of 4.53, a b-value of 0.823, a total of 776 mainshock events, 304 clusters, and releasing a seismic moment of 1.3% of the total seismic moment at that location. Gardner-Knopoff method (1974) showed results with an a-value of 5.1, a b-value of 0.929, a total of 1097 main shock events, 319 clusters, and a release of 1.08% of the total seismic moment at that location. The Uhrhammer method (1986) is suitable for seismic hazard assessment with the maximum level of risk. Meanwhile, for more conservative results, the Gruenthal method is recommended. Keywords: Aceh, earthquake, mainshock, foreshock, declustering Share Link | Plain Format | Corresponding Author (Juellyan Juellyan)

54	Interdisciplinary Geosciences	ABS-101
Rapid flood assessment using modified Geomorphic Flood Index (GFI) model based on flood event data: a case study at Cikapundung Watershed Asep Ferdiansyah (a*), Eka Oktariyanto Nugroho (b), Edi Riawan (c), Agung Wiyono Hadi Soeharno (b), Aditya Rivandi (a), Mohammad Farid (b), Arno Adi Kuntoro (b) (a) Water Resources Engineering Master^s Program, Bandung Institute of Technology, (b) Water Resources Engineering Research Group, Civil Engineering Study Program, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, (c) Science Atmosphere Research Group, Faculty of Earth Science and Technology, Bandung Institute of Technology Abstract This study contains the procedures to validate the inundation based on flood event in the modified Geomorphic Flood Index (GFI). The procedures also have capability to distinguish the causes of flood inundation in a watershed. The causes of inundation in the Cikapundung River are divided into 2 types. The first is inundation from the fluvial flood and the second is urban flood. The lack of rapid information of the low capacity of the river and obstruction flow of drainage water into the river as a result of the high river water level are the challenge in this research. Based on the validation results in the field indicate that the flood event data on inundation can be useful for modified GFI model to describe flood inundation rapidly as a result of drainage or urban flood and the inundation generated by fluvial flood. The procedure to validate the flood also be the main focus on this research as well as the modification of the original GFI by adding land use and effective rainfall ratio. Keywords: modified geomorphic flood index- rapid assessment- flood event Share Link | Plain Format | Corresponding Author (ASEP FERDIANSYAH)

55	Interdisciplinary Geosciences	ABS-102
GEOLOGICAL MAPPING AND HAZARD POTENTIAL OF THE ABANDONED MAMUT COPPER MINE (MCM) AT RANAU DISTRICT, SABAH, MALAYSIA. Nur Ayu Sufiah Khairul1, Junaidi Asis1 and Baba Musta1,2* 1 Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Sabah, Malaysia. 2 Natural Disaster Research Centre (NDRC), Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Sabah, Malaysia. Abstract Cu-Au mine was one of the main economical resources in Sabah (Malaysia) that operated from 1975 to 1999, known as the Mamut Copper Mine (MCM) located in Ranau district. According to previous research, the currently abandoned MCM could potentially become the main source of contamination in the drainage system around the Ranau district due to the existence of the acid mine drainage. The accumulation of contaminants is related to instability such as landslides and slope failure of the pit wall, in which the materials are transported by erosion and surface drainage through rainfall events. Thus, the main purpose of this research is to assess the hazard and the risk of the MCM pit wall, while determining the major rock unit that contributes to the contamination. These will be achieved by fieldwork observation, such as proforma landslide inventory that is supported by borehole data of the study area. It was found that mine waste, alongside the silicified rock has contributed to the above matter due to the intensive existence of loose materials that will easily fall along the pit wall. Keywords: Contamination, acid mine drainage, instability, loose materials. Share Link | Plain Format | Corresponding Author (NUR AYU SUFIAH KHAIRUL)

56	Interdisciplinary Geosciences	ABS-107
Reconstruct land subsidence in Jakarta from physical evidence Heri Andreas, Dina Anggreni Sarsito, Dhota Pradipta, Hasanuddin Z Abidin Institute of Technology Bandung Abstract Land subsidence can be revealed properly through GNSS (Global Navigation Satellite System) measurements and InSAR (Interferometry Synthetic Aperture Radar) and or other measurements. In terms of quality, the results from the time series measurement have obtained high accuracy at the millimeter level up to 1-2 centimeters. The quality parameter results are obtained from the standard deviation of the results and or the correlation between results of the measurement methods. To be more certain about the occurrence of land subsidence, we can reconstruct land subsidence using physical evidence, such as changes in the position of bridges relative to the water level, the relative position of buildings or structures on the coast to the sea and so on. Looking at physical evidence, we can also review when land subsidence occurred or estimate how long land subsidence occurred. This paper will try to show the results of land subsidence reconstruction in Jakarta using physical evidence. The results of the reconstruction show that the beginning of land subsidence in Jakarta occurred in the 1970s. The reconstruction results are validated by the results of leveling and GNSS measurements. Keywords: land subsidence, reconstruct, physical evidence, measurement Share Link | Plain Format | Corresponding Author (Heri Andreas)

57	Interdisciplinary Geosciences	ABS-108
The risk of ignorance of DEM Height Reference System on coastal inundation modeling (the case of Jakarta) Heri Andreas, Firman Juliandri, Dhota Pradipta, Dina Anggreni Sarsito, Hasanuddin Z Abidin Institute of Technology Bandung Abstract As a result of continuing land subsidence which is also followed by sea level rise, some lowland coastal areas will experience coastal inundation. The lowlands will gradually become lower than sea level at high tide and even during normal conditions. Some areas where when it is not high tide experience coastal inundation permanently. Coastal inundation modeling is important to do so that we get potential hazards and disaster risks from the occurrence of it. With coastal conditions that are usually inhabited by many people, become economic centers and others, then when coastal inundation occurs, material losses will certainly occur as well. To create a coastal inundation model, parameters are needed including the Digital Elevation System (DEM). The coastal lowlands are represented from the DEM. From the corrected DEM for land subsidence, sea level rise and tidal hydraulic models, we will get a coastal inundation model. The most important thing related to this is the accuracy of the DEM itself and the height of the reference system. If we don^t use an accurate DEM, and don^t use the height reference system correctly (should be High Tide or Mean Sea Level), then we won^t get a good coastal inundation model. The impact is that we will not be correct map the hazards and disaster risks due to the coastal inundation. This paper will demonstrate the risk when we ignore the height reference system, so that we get a miss leading in the dangers and risks of coastal inundation in Jakarta as a case study area. Keywords: DEM, Coastal Inundation, Heigh Reference System, Risk Share Link | Plain Format | Corresponding Author (Heri Andreas)

58	Interdisciplinary Geosciences	ABS-112
Characterizing favorable climatic and geographical conditions for salt farms: A case study of Madura Island Rikha Bramawanto(1*), Suaydhi Suaydhi(1), Robi Muharsyah(2), Makhfud Efendy(3), (1)Research Center for Climate and Atmosphere, National Research and Innovation Agency (*) rikha.bramawanto[at]brin.go.id (2)Meteorology, Climatology, and Geophysical Agency (3)Marine Science, Trunojoyo University Abstract Madura is one of the salt production centers in Indonesia, especially in the southern part of the island. The reasons why the Madurese and VOC in the past built more salt farms on the south coast are still being determined. There are presumptions that differences in climatic factors are the reasons behind this condition. The study aims to reaffirm the justification for determining land suitable for salt farms on Madura Island. This article presents the climate characteristics of north and south coasts of Madura. The latitude line of 7 degree South roughly separates these two regions. The rainfall data are based on daily and monthly records of 39 rain gauges in Madura over 30 years. Limiting the missing data to less than 10 percent, five and nine locations in the northern and the southern, respectively, are used for this study. Researchers also analyzed soil properties and the elevation of the coast in both. The study results show that, on average, the rainfall in the south is slightly lower than in the north. As a result, the dry spell in the south is longer than in the north. On the other aspect, the expanse of flat area in the south is large than in the north. These conditions make the south of Madura more favorable for salt farming. However, the extensification of salt farms in northern Madura still has the potential to be developed. Keywords: climate, dry spell, flat area, Madura, salt farming. Share Link | Plain Format | Corresponding Author (Rikha Bramawanto)

59	Interdisciplinary Geosciences	ABS-115
STREAMFLOW CHARACTERISTIC ASSOCIATED WITH GLOBAL ATMOSPHERIC CIRCULATION Fauzan Ikhlas Wira Rohmat (a), Dede Rohmat (b), Faizal Immaddudin Wira Rohmat (a,c,*), Wendi Harjupa (d) (a). Water Resources Development Center, Bandung Institute of Technology, CIBE Building 5th Floor, Jalan Ganesa No. 10, Bandung 40132, West Java, Indonesia- fauzaniwr[at]gmail.com (b). Department of Geography, Indonesia University of Education, Jalan Dr. Setiabudhi No. 229, Bandung 40154, West Java, Indonesia- dede_rohmat[at]upi.edu (c). Faculty of Civil and Environmental Engineering Bandung Institute of Technology, FTSL Building, Jalan Ganesa No. 10, Bandung 40132, West Java, Indonesia- (d). Research Center for Climate and Atmosphere, National Research and Innovation Agency (BRIN), Bandung 40173, West Jawa, Indonesia- wend003[at]brin.go.id *Correspondence: faizalrohmat[at]itb.ac.id Abstract Global atmospheric circulation plays a role as one of the most important factors affecting water characteristics in the watershed area. Particularly in the Indonesian Maritime Continent (IMC), El Nino Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), Madden-Julian Oscillation (MJO), and Monsoon affects water circulation and availability differently in each watershed. This research analyzes streamflow data that represent water characteristics in Tondano, Kapuas, and Jangka watershed that variate to global atmospheric phenomena from 2000 to 2022. This variation is defined by a correlation analysis associated with each watershed location, geomorphology, population, and activity that affects the watershed. Data shows that Tondano and Jangka Watershed streamflow has the most correlation value with ENSO phenomena, whereas the Kapuas Watershed streamflow correlated mostly with Monsoon Phenomena. Moreover, IOD phenomena show a significant correlation with the Tondano watershed streamflow, and MJO phenomena correlated significantly with the Kapuas and Jangka watershed streamflow. Geographically, the location of each watershed might be the significant factor for the defined correlation value, which is further supported by other characteristics such as area size, land use, and the general pattern of water use in each watershed. This fact can be used as a valuable overview for water management and adaptation to global climate change. Keywords: Global Atmospheric Circulation- Watershed- Water Characteristic- Streamflow- Correlation Analysis- Share Link | Plain Format | Corresponding Author (Fauzan Ikhlas Wira Rohmat)

60	Interdisciplinary Geosciences	ABS-127
Identification of Anthropogenic Influences to Groundwater in Pangalengan Highlands Arif Susanto, Dasapta Erwin Irawan, Farhan Hudaya Mochammad, Rifky Rizqullah, Enggal Estuaji, Dita Aprilia Putra, Dziki Hilmawan, Fadhlan Rahmany Binadzier Faculty of Earth Sciences and Technology, Institut Teknologi Bandung Abstract Pangalengan Plateau is a volcanic area which is famous as one of the centers of tea plantations in Indonesia. The majority of land use is in the form of plantations, but this does not rule out the possibility of anthropogenic contamination of groundwater. As many as 30 groundwater quality data have been collected from springs, dug wells, and drilled wells. We measured temperature, EC, pH, and the content of major elements (Ca, Na, Mg, K, SO4, HCO3, Cl, NO2, dan NO3), NH4, and organic components (Ecoli and total coliform). Multivariable statistical analysis was used to identify possible anthropogenic influences in the groundwater. We apply Principal Component Analysis and Distance Mapping Analysis with the Python programming language (Orange Data Mining). We managed to identify the prominent components of NO2, NO3, and NH4 in water. It is suspected that this condition is caused by the influence of fertilizers, plant medicines, plantation, and domestic waste that flows on the surface of the soil and rivers. These substances then seep into the soil layers and then reach the groundwater zone. The influence of domestic waste is also marked by the emergence of Ecoli bacteria and high coliform values. Keywords: Pangalengan, anthropogenic, water quality, domestic waste, plantation waste Share Link | Plain Format | Corresponding Author (Arif Susanto)

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