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

Topic: Solid Earth Sciences