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121	Solid Earth Sciences	ABS-85
Study of Potential Geosites in Ngarai Sianok - Maninjau Area and Silokek Geopark Area based on UNESCO Assessment Parameters Fakhri Irsyad Anwar (a*), Mirzam Abdurrachman (a), Idham Andri Kurniawan (a), Abdillah Baraas (a), Firman Sauqi Nur Sabila (a), Dian Hardiansyah (a), Fachri Vanrenov (a), Muhammad Bahrun Najah (a), Muhammad Hafizh (a) Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *fakhriirsyadanwar[at]gmail.com Abstract The Ngarai - Sianok Geopark and the Silokek Geopark are part of the national geopark that will be proposed to become a UNESCO Global Geopark, the locations of these two geoparks are in West Sumatra Province, for the Ngarai Sianok - Maninjau Geopark, namely Agam Regency and Bukittinggi City and for the Silokek Geopark it is in Sijunjung district, this study aims to evaluate several geosites in the Ngarai Sianok - Maninjau Geopark area, including evidence of faults in Sianok Gorge, Tarusan Kamang, Simarasok Ngalau, Lake Maninjau, Lake Maninjau Hot Springs, Sarasah Pontong, and Sungai Sariak Waterfall, Timbulun Waterfall and Blue Lake, based on geological observations and feasibility based on UNESCO standards. The results of this study are recommendations for Geopark areas, especially in geosite locations. This study method uses field geology data and geotourism analysis methods in various places on geosites in these two geopark areas. Field geological data is in the form of geomorphological observations, structural geological observations, and lithological observations. Geoutourism analysis, namely conducting direct observations which are then assessed based on the parameters of the feasibility and readiness of UNESCO geoparks Geologically, the uniqueness of the Ngarai Sianok - Maninjau Geopark is the Great Sumatran Fault that passes through this geopark area and Lake Maninjau, which is the caldera of Quaternary Mount Sitinjau. The eruption products from Mount Sitinjau can be seen clearly from the Lake Maninjau area, Ngarai Sianok, and even to the east, namely at the Ngalau Simarasok Geosite. The Geological Area of &#8203-&#8203-the Silokek Geopark is unique in the form of ancient Permian-aged karst rocks raised above tertiary granite rocks that are younger, the karst cave has traces of ancient human remains to colonial civilization, besides that there are manifestations of hot springs originating from Mount Talang and the water of the Seven Levels Waterfall, which empties into the Kuantan River Stem. Keywords: Ngarai Sianok, Maninjau, Silokek, Geopark, Great Sumatran Fault, UNESCO Share Link | Plain Format | Corresponding Author (Muhammad Bahrun Najah)

122	Solid Earth Sciences	ABS-98
Petrogenesis of Volcanic Cones Intra Tondano Caldera, North Sulawesi Ambarwati Puspanegara (a), Mirzam Abdurrachman (a), Mochamad Nugraha Kartadinata (b) Geological Engineering Study Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology (a), Centre of Volcanology and Geological Hazard Mitigation (b)Please Just Try to Submit This Sample Abstract You Can Edit It Again Later Abstract Tondano Caldera is the result of an explosive eruption that was formed about 1.25 to 2 million years ago in North Sulawesi. After that, volcanic activity was still ongoing, marked by the formation of volcanic cones in the Tondano Caldera, including Lokon Complex and Tampusu Complex. Previous research at Tampusu Complex only discussed the geothermal system in the surrounding area and for Lokon Complex it was necessary to update data because from 1829 to 2015 there had been 37 eruptions. This study aims to map the distribution of volcanic products, the history of the formation and evolution of magma, and to determinethe tectonic setting based on petrogenesis studies. Based on the volcanostratigraphic analysis, the study area was formed during 14 phases of formation of khuluk and gumuk consisting of 10 khuluks and 6 gumuks. The evolution of magma in the study area shows a repetition of magma differentiation processes, primitive magma injection and magma assimilation which is reflected in fluctuations in anorthite content and rock texture. Based on plagioclase microtexture analysis, the processes that occur include decompression due to primitive magma, crystal fractionation, self mixing due to convection, heating due to primitive magma mixing, cooling due to eruption, and decompression during eruption. Analysis of spider diagrams, bivariate and ternary diagrams between geochemical content, and comparisons between trace elements shows that Lokon Complex and Tampusu Complex are tectonically included in active continental margin with medium K calc alkaline magma series from East Sangihe Subduction. Keywords: Petrogenesis, Tondano Caldera, Lokon Complex, Tampusu Complex, magma evolution Share Link | Plain Format | Corresponding Author (Muhammad Bahrun Najah)

123	Solid Earth Sciences	ABS-105
Peak Ground Velocity (PGV) estimation of Mw 5.6 Cianjur earthquake November 11th, 2022 using Global Positioning System (GPS) Susilo Susilo (a*), Irwan Meilano (b), Sidik Tri Wibowo (c) a) Research Center for Geospatial, National Research and Innovation Agency, Indonesia * susilo.2[at]brin.go.id b) Faculty of Earth Science and Technology, Institute of Technology Bandung (ITB), Indonesia c) Center for Geodetic Control Network and Geodynamic, Geospatial Information Agency, Indonesia Abstract The primary purpose of GPS is to be used for positioning, navigation, and timing (PNT). In the last decade, research on GPS for earthquake hazards has increased rapidly, such as for tectonic deformation, GPS seismology, modeling earthquake source parameters, estimation of magnitude, etc. In this study, following the Mw 5.6 Cianjur earthquake on November 11th, 2022, we estimate the peak ground velocity from the CJUR GPS station, which is located about 5 km from the epicenter. We compute GPS velocity from the high-rate GPS receiver independent exchange (RINEX) data and broadcast ephemeris. Using a narrow line combination of L1 and L2 observations, we invert velocity epoch by epoch. The result shows the CJUR GPS station has a peak ground velocity of about 11.5 cm/s and equal to VI MMI scale. The peak ground velocity from the GPS station could be important for deriving the earthquake shakemap. By increasing the number of GPS stations in Indonesia, it is very important to support earthquake hazard monitoring. Keywords: PGV, GPS, earthquake, Cianjur Share Link | Plain Format | Corresponding Author (Susilo Susilo)

124	Solid Earth Sciences	ABS-106
Characteristics and Mechanism of Back-Arc Fold-Thrust-Belt an Implication to Earthquakes Hazard Benyamin Sapiie, Meli Hadiana, Terry Alfa Furqan, Rayhan Tirto Nugroho Prodi Teknik Geologi, Institut Teknologi Bandung Abstract Fold-thrust belt (FTB) is one of the most complex deformations of sedimentary rocks. Back-arc FTB is one of the kinds observed in active subduction tectonic settings. This FTB raises a question concerning their mechanism and geologic controlling factors mainly related to earthquakes hazard. The knowledge of structural development, such as FTB resulting from rock deformation, is limited due to poorly known in situ rock properties. Investigating rock deformation using a sandbox modeling approach can solve these problems because it can relate and compare the initial undeformed stages with their later deformed stages. This comparison is critical in understanding the structural development or evolution resulting from the specific setting of rock deformation, particularly in the sedimentary basin. Sandbox modeling has been used widely in structural geology to understand complex deformation patterns such as fold-thrust-belt and strike-slip fault systems. The experiment uses standard custom-built sandbox apparatus in the ITB sandbox-modeling laboratory. The device used in this experiment is an open-topped glass box with fixed external walls and one or two moveable internal walls pushed by screw jacks driven at a constant velocity by a stepper motor. In this study, sand grains are natural dry quartz sand with a Navier-Coulomb rheology and an angle of internal friction of about 30o, similar to many sedimentary rocks. Particle Image Velocimetry (PIV) was used to evaluate strain distributions and fault sequences. The results of the PIV analysis show that there is evidence of segmentation in the model. This segmentation marked the difference in speed between fault sequences. The fault pattern, geometry, and style produced by the model are very similar to the pattern mapped like the back-arc FTB (for example, the Baribis system) in nature. Therefore, it can be concluded that the fault mechanism in FTB is highly influenced by lithology variation and pre-existing basement faults. Keywords: Back-Arc Fold-Thrust Belt, Sandbox modeling, deformation, earthquakes hazard Share Link | Plain Format | Corresponding Author (Benyamin Sapiie)

125	Solid Earth Sciences	ABS-114
Volcanic Geohazard Analysis - Case Study from the Ujung Lemah Abang Nuclear Power Plant Area, Central West Java Prihadi Sumintadireja (1), Mamay Surmayadi (2), I Gusti Bagus Eddy Sucipta (1), Alfend Rudyawan (1) (1) Engineering Geology Study Program, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (2) Center of Volcanology and Geology Hazard Mitigation, Jl. Diponegoro 57, Bandung 40122 Abstract The government of Indonesia is starting plan to develop nuclear power plant at Ujung Lemah Abang (NPP-ULA) area since more than 35 years ago is located in the north of Mt. Muria, central java. The evaluation of Mt. Muria geohazard site investigation to volcanic hazard is very important due to risk of environment damage, human casualties as well as the infrastructure investment. Bayesian method, which applied in this evaluation based on probabilistic model development of post volcanic activity and geology model process in the past. Mt. Muria is polygenetic volcano with cyclic eruption activity of flank eruption and dominant central eruption. The eruption point changes from central eruption becomes flank eruption is commonly occurs. Volcanic geohazard source in Mt. Muria complex is from central eruption, dome extrusion and maar development in the flanks. The semivariogram analysis showing value range of 150.000 years, which is correlated with average longevity of volcanic activity record and eruption break time. Since, the last activity is 320,000 years ago, therefore, the Mt. Muria complex can be considered as dormant volcano and have a little possibility become capable eruption volcano in the near future. Keywords: Volcanology, Geohazard, Nuclear, Power Plant Share Link | Plain Format | Corresponding Author (Alfend Rudyawan)

126	Solid Earth Sciences	ABS-117
Petrogenesis of Kelimutu Volcano and Its Surroundings: A Preliminary Study Based on Geochemical Data Muhammad Bahrun Najah (a*), Mirzam Abdurrachman (a), Muhammad Hafizh (a) (a) Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *m.bahrun29photo[at]gmail.com Abstract Kelimutu Volcano has a highest point is 1639 masl, it is located in Ende Regency, East Nusa Tenggara. The volcano has a characteristic in the form of three crater lakes at the summit. The volcano is located in the southern part of Flores Island, East Nusa Tenggara, it was formed as a result of the interaction between the Indo Australian Plate and the Eurasian Plate. The tectonic setting of Kelimutu Volcano and its surroundings is still not well defined. One of the causes of this is the lack of rock geochemical data which is one of the data to define tectonic setting. Rock geochemical data in this study are used to define tectonic setting through a petrogenesis approach. Geochemical data were obtained through XRF analysis (for major components) and ICP MS analysis (for trace components). Discriminant diagrams are used to determine the tectonic setting with parameters in the form of main components and trace components. Based on the results of the plot of the discriminant diagram of trace components that consist of Zr/Y Ti/Y, Ti/100 Zr Sr/2, and TiO2 P2O5 MnO so that The Kelimutu Volcano is included in the tectonic setting in the form of island arcs. Keywords: Kelimutu Volcano, Petrogenesis, Geochemical, Island Arc Share Link | Plain Format | Corresponding Author (Muhammad Bahrun Najah)

127	Solid Earth Sciences	ABS-122
The Geometry and Thermal Models of the Flores Thrust Harisma Andikagumi, Kyle Bradley Earth Observatory of Singapore, Nanyang Technological University, Singapore- Asian School of Environment, Nanyang Technological University, Singapore Abstract The 2018 Lombok earthquake demonstrated the hazard that the Flores Thrust possess and highlighted our lack of knowledge on this crustal scale back thrust. The Flores Thrust extends from west to east, located at the backarc of the Lesser Sunda Islands, Indonesia. Here we construct the geometry model of the Flores Thrust by fitting the best surface on the relocated earthquake catalogues using simulated annealing and interpolating using FastRBFTM algorithm. The thrust has a flat and a ramp component, where the flat is generally constant, inclined ~5&#730- southward, but limited between eastern Bali and western Sumbawa formed due to the sediment-filled North Bali-Lombok basin. The ramp of the thrust is dipping southward with 38&#730- average dip, where the dip increases eastward from Bali (27&#730--37&#730-) to Lombok (28&#730--38&#730-), Sumbawa (30&#730--50&#730-), and western Flores (40&#730--58&#730-), but then shallower in central Flores (29&#730--39&#730-). Based on our analysis of volcano distribution, the seismogenic zone of Flores Thrust is constrained by arc volcano distribution- bounded by volcanoes at the eastern and the western tips while the deeper part is terminated by the along-arc distribution of volcanoes or where the temperature exceeds 450&#730-C. The interaction between fault propagation and arc volcanism possibly influences the geometry of Flores Thrust and perhaps affecting the arc by migrating the active volcanism northward in Sumbawa, leaving extinct edifices in its south while forming the highly potassic rear-arc volcanoes, Tambora and Sangeang Api, in the north. The other alternative to explain the segmented geometry of the thrust is that the thrust was initiated from multiple isolated faults that interconnected in the later stage of fault development. Therefore, the complexity of the Flores Thrust geometry and its interplay with the volcanism should be investigated further, to mitigate the greater effects of any geohazards in the region. Keywords: Flores Thrust, Volcano, Fault Model, Thermal Model Share Link | Plain Format | Corresponding Author (Harisma Andikagumi)

128	Solid Earth Sciences	ABS-129
Fragmentation Evaluation of Some Selected Mudrock in Indonesia Indiced by Physical and Mineralogical Properties Misbahudin1, Pramudya Rinengga Datu Perdana1, Dian Yesy Fatimah1, Fajar Febiani Amanda1, Dyah Pratiwi Kusumastuti2, Budi Wicaksono2, Arief Suardi Nur Chairat3 1Geology Engineering Study Program, Faculty of Exploration and Production Technology, Universitas Pertamina, Indonesia 2Civil Engineering Program, Institut Teknologi Perusahaan Listrik Negara (ITPLN), Indonesia 3Industrial Engineering Program, Institut Teknologi Perusahaan Listrik Negara (ITPLN), Indonesia Abstract Not many mud rocks from various formations have been evaluated for slaking characteristics in Indonesia. Mudrock disintegrate rapidly when interacting with the atmosphere and hydrosphere. This research investigates the mudstones from the Kerek Formation and then evaluates their fragmentation resulting from slaking. This formations are known for causing road, slope, and land-strengthening engineering problems. Rocks frequently result in slope failure in the area around their outcrops. The method includes quantitative analysis of rock slaking levels, which collide with the physical and mineralogical properties of the rocks. The slaking test with natural exposure for five cycles was carried out on the samples. The mineralogical composition of mudrock does not show a significant relationship, likewise, with the macroscopic texture of the sample. The presence of abundant fossils in the sample affects the slaking level of the sample. We found the slaking index values of the samples generally shows slight difference. The results of this study can be correlated with other mudrock in different areas and formation in Indonesia. Specifically, the relationship between rocks physical properties and microscopic texture should be considered in the slaking classification of rocks. Keywords: mudrock, slaking, fragmentation, microscopic texture, mineralogy Share Link | Plain Format | Corresponding Author (Misbahudin .)

129	Solid Earth Sciences	ABS-133
Source Mechanism Analysis of Aftershocks of the Mw 5.6 Cianjur, West Java Earthquakes Using Local Seismographic Networks Muhammad Fikri Azhari (a*), Andri Dian Nugraha (b), Zulfakriza (b), Aditya Lesmana (b) a) Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *fikriazharimuhammad[at]gmail.com b) Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology Abstract On November 21, 2022, a significant earthquake shook the Cianjur area, West Java causing severe damage to the area. In this study we analyzed the seismicity by magnitude and hypocenter of the 2022 Cianjur Earthquakes. Twenty stations were deployed to monitor aftershocks from 22 November to December 2022. We determined earthquake locations through re-picking of the P- and S-waves arrival times recorded by the local network. The aftershock hypocenters were determined using a nonlinear approach and relocated using double-difference method. We also conducted focal mechanism analysis to estimate the type of fault slip. The results indicate improved hypocenter locations, where patterns of seismicity in Cianjur, West Java were delineated clearly. There were more than 400 aftershocks with the largest magnitude Mw 4.2 and the smallest Mw 1.2. Based on the results of the focal mechanism model, this earthquakes caused by a right strike slip mechanism. This earthquake cluster is outside the Cimandiri fault zone, there is a possibility that the source of the earthquakes was caused by a fault that has not been identified. Keywords: Cianjur Earthquakes- Local Seismographic Networks- Source Mechanism. Share Link | Plain Format | Corresponding Author (Muhammad Fikri)

130	Solid Earth Sciences	ABS-134
Determination of Laterite Bauxite Deposit Data Domains in The Mempawah Prospect of PT ANTAM Tbk Through Geochemical Characteristics of Each Source Rocks Arif Hindarto (a,b), Guntur Ghiffari (a,b), Dedi Sunjaya (b), Mirzam Abdurrachman (a) (a) Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia (b) Unit Geomin, PT ANTAM Tbk, Jalan TB Simatupang 1 Jakarta Abstract The regional geology of the study area is included as part of the Singkawang Batolith with Mensibau Granodiorite and Raya Volcanic rocks from the lower cretaceous as potential bauxite-forming rock. PT Antam Tbk was began the investigation of laterite bauxite deposits in Mempawah Regency and its surroundings in 2006. This investigation resulted in an expansion of the laterite belt area in West Kalimantan from previous exploration results discovered by the Japanese in 1943 and Alcomin in 1969-1974. The presence of bauxite deposits investigated by digging testpit exploration, instead of drilling methods, to obtain undisturbed samples of lateritic bauxite. The results of the testpits excavation were then recorded as overburden interval and bauxite interval, samples from the bauxite interval were then washed to remove clay impurities before being analyzed in the laboratory using XRF and Wet Analysis. From the exploration results in the research area, it was found that washed bauxite with an average grade of Al2O3 40,69% with a Coefficient of Variation (CV) of 0,18, Total Silica (T-SiO2) 24,58% with CV of 0,61, Reactive Silica (R-SiO2) 3,88% with CV of 0,78, Fe2O3 12,93% with CV of 0,54, and TiO2 0,90% with CV of 0,38. The average grade and CV values obtained indicate that this deposit is quite homogeneous, but statistical analysis showed that the histogram of T-SiO2, Fe2O3, and TiO2 grades has a distribution with two histogram peaks indicating the presence of multiple data populations that were still mixed in the bauxite laterite intervals of the exploration data. Laterite domain division needs to be done to separate the data population so that it can be used in the process of resource estimation according to the proper lateralization domain to obtain a more reliable and robust resource model. The lithology of the bauxite-forming rocks from the results of detailed geological mapping is evaluated against their geochemical characteristics to separate the bauxite domain laterally. The lithology of granodiorite, porphyritic granodiorite, and diorite from the Mensibau Granodiorite rocks and the lithology of tuff, andesitic lava, and intrusive andesite from the Raya Volcanic rocks as the source rock of the laterite bauxite were analyzed for variations of T-SiO2, Fe2O3, and TiO2 to identify the lateral domain of bauxite in the area. Laterally, two domains were obtained with TSiO2 as the most dominant distinguishing geochemical content. Dom 1 is a domain of low silica bauxite deposited from the source rocks with the lithology of diorite, intrusive andesite, and andesite lava. Dom 2 is a domain of medium to high silica bauxites deposited from source rocks with the lithology of granodiorite, porphyritic granodiorite, and tuff. While vertically, based on the amount of free silica content that tends to increase at the bottom of the bauxite layer, it can be divided into the bauxite (Bx) subdomain at the top and the quartz bauxite (QBx) subdomain at the bottom with a higher silica content. Dom 1 consists only of the Bx subdomain, while Dom 2 consists of the Bx and QBx subdomains. The results of the statistical grade analysis after the separation of bauxite domains in the study area showed that Dom 1 Bx had an average grades of Al2O3 45,56% with CV 0,15, T-SiO2 9,20% with CV 0,91, R-SiO2 2,58% with CV 0,76, Fe2O3 18,67% with CV 0,32, and TiO2 1,22% with CV 0,26. Dom2 Bx showed an average grades of Al2O3 41,30% with CV 0,10, T-SiO2 29,07% with CV 0,25, R-SiO2 3,47% with CV 0,37, Fe2O3 8,85% with CV 0,36, and TiO2 0,72% with CV 0,28. Dom2 QBx showed an average grades of Al2O3 31,39% with CV 0,11, T-SiO2 43,96% with CV 0,14, R-SiO2 5,19% with CV 0,46, Fe2O3 9,27% with CV 0,61, and TiO2 0,71% with CV 0,36. From the separation of bauxite domains and subdomains laterally and vertically, three bauxite data populations were obtained in the form of Dom 1 Bx, Dom 2 Bx, and Dom 2 QBx with the initial bauxite assay sample number of 4,052 samples divided into 1.445 Dom 1 Bx samples, 1.851 Dom 2 Bx samples, 476 Dom 2 QBx samples, and 280 non-bauxite samples that logged as bauxite samples from the exploration results were excluded. Dom 1 Bx and Dom 2 Bx are the two main domains in the research area that have good quality to be developed into resource areas for mine economic evaluation. Keywords: Bauxite, Laterite, Domain, Geochemical, Characteristics, Lithology Share Link | Plain Format | Corresponding Author (Arif Hindarto)

131	Solid Earth Sciences	ABS-136
ADVANCE TYPE OF CEMENT FOUND IN THE GUNUNG PADANG MEGALITHIC SITE - FACT OR MYTH? Nurcahyo Indro Basuki, Benyamin Sapiie Geological Engineering, Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia Abstract In its heyday, the Gunung Padang megalithic site in the Cianjur area, West Java, was believed to be among the most spectacular human-made structure. Some claimed the site was older than The Great Pyramid of Giza in the Egypt, and hence, the civilization of the ancient Indonesian society predated the ancient Egyptian civilization. Other interesting claim was that andesitic block materials (blocks of columnar joint) that were arranged to build the structure were glued to each other using advance type of cement. This type of cement contained relatively high iron-magnesium oxides and clay minerals, with some amounts of quartz. Hematite and magnetite were also reported to be present. The cement was applied between columnar joint blocks as different thin layered and was interpreted as evidence of engineering process done by ancient civilized society. This study aims to re-study the so called cement materials, especially on the texture of their constituent materials using thin section petrography analysis, combined with geochemical XRD analysis. The objective is to determine the nature of the cement material and its most likely origin. The results may shed some lights on the origin or construction of Gunung Padang megalithic site, at least the upper parts of the site. Keywords: Gunung Padang, cement, thin section, XRD analysis Share Link | Plain Format | Corresponding Author (Nurcahyo Indro Basuki)

132	Solid Earth Sciences	ABS-138
EARLY IDENTIFICATION OF GROUNDWATER POTENTIAL ZONE USING MORPHOMETRIC ANALYSIS IN IKN (IBU KOTA NUSANTARA) DEVELOPMENT AREA, EAST KALIMANTAN, INDONESIA Hirundini Rustica Absari (a)*, Giri Bayu Aji (a), Astyka Pamumpuni (a) (a) Faculty of Earth Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *hirundiniabsari25[at]gmail.com Abstract The relocation of the capital city of Indonesia from Jakarta to Ibu Kota Nusantara (IKN) would be followed by a migration population. The new capital city of Indonesia is located in Penajam Paser Utara and Kutai Kartanegara Regencies, East Kalimantan. This center of population activity causes clean water needs to increase. The main source of clean water to support the basic needs of the population is groundwater. To find out the presence of groundwater, early identification is needed to carry out before field checking. The identification is using remote sensing data from DEMNAS. The data is processed and analyzed for its morphometric characteristics to indicate the potential zone of groundwater, from low to high potency. The morphometric aspects used are linear, relief, and areal. Based on the analysis, the southeastern areas of IKN have high potencies of groundwater than the northwestern areas. The low potential zone groundwater in the northwest area of IKN needs special attention because it is the National Capital Area (KI-IKN). Keywords: Ibu Kota Nusantara, morphometric analysis, groundwater potential zone. Share Link | Plain Format | Corresponding Author (Hirundini Rustica Absari)

133	Solid Earth Sciences	ABS-139
Review of the Morphological changes of Anak Krakatau before and after 2018 Eruption using Drone Wilfridus F. S. Banggur (a*), Aditya Pratama (a), Taufik Ismail (a),(b), Dini Nurfiani (a), MN Kartadinata (c), Devy Kamil Syahbana (c), Deni Mardiono (c), Estu Kriswati (a), Philipson Bani (d), Muhammad Zain Tuakia (e) a) Center of Geological Disaster Research, Indonesia Agency of Research and Innovation, Bandung 40135, Indonesia *wilf001[at]brin.go.id b) Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Bandung 40132, Indonesia c) Centre for Volcanology and Geological Hazard Mitigation, Bandung 40122, Indonesia d) Laboratoire des Geosciences et Physique de la matiere condens ee, Universit e de la Nouvelle Cal edonie, BP 4477, Noumea, New Caledonia, France e) Research Center for Geological Resources, National Research, and Innovation Agency (BRIN), Bandung 40135, Indonesia Abstract We have taken aerial photo data using drones on Anak Krakatau in 2013, 2019, 2020 and 2021. The drone used is a quadcopter, flown at an altitude of 250 meters, with a north-south and east-west direction over Mount Anak Krakatau. Changes in the morphology of Anak Krakatau occurred so quickly as its volcanic activity never stopped. Its pyroclastic cone in 2013 reached a height of 334 meters with a coastline circumference of 6.8 km. The circumference of the pyroclastic cone calculated from the traces of the old crater wall has a volume of 31971 m3. As secondary data to determine changes in morphology between the 2013 and 2018 eruptions before the eruption and the tsunami, we used satellite imagery, seismic recordings, to find out the volcanic activity that affected the morphological changes. The December 2018 eruption and tsunami have changed the morphology of Anak Krakatau. Pyroclastic cones and lava flow products that dominate in the south to west have collapsed and become a crater opening with a diameter of 400 meters, level with sea level. The coastline has increased in circumference to 7.2 km with a height of 156 meters. The body of Anak Karakatu has experienced an addition to the coastline, especially on the South, East and North sides. This happened due to the eruption and tsunami accompanied by avalanches during the December 2018 eruption. During the 2020 and 2021 eruption periods, the coastline has not changed. This period was marked by the growth of a pyroclastic cone in the crater that had formed previously during the 2019 eruption. The pyroclastic cone was opened to the southwest by lava flows that flowed westward as far as 600 meters. Keywords: Anak Krakatau- morphology changes- drone. Share Link | Plain Format | Corresponding Author (Aditya Pratama)

134	Solid Earth Sciences	ABS-146
Penggunaan EDM Beta Beti ITB Abstract Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry^s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Keywords: Key1 Share Link | Plain Format | Corresponding Author (Beta Beti)

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