Analysis of Tsunami Hazard in the Southern Coast of West Java Province - Indonesia 1,3Wiwin Windupranata, 2Nuraini Rahma Hanifa, 3Candida Aulia de Silva Nusantara, 4Gina Aristawati, 4Muhammad Rizky Arifianto
1Research Group of Coastal, Ocean and Maritime Engineering, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung 2Center for Earthquake Science and Technology, Research Center for Disaster Mitigation, Institut Teknologi Bandung 3Research Laboratory of Hydrography, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung 4Study Program of Geodesy and Geomatics Engineering, , Faculty of Earth Sciences and Technology, Institut Teknologi Bandung
Abstract
The Southern Coast of West Java Province in the Java Islands is one of prone and exposed area to tsunami hazard. It has about 428 kilometers coastline length, covering 5 administrational regencies (i.e. Sukabumi, Cianjur, Garut, Tasikmalaya, and Pangandaran). It is a strategic area that support many economic activities including tourism, fisheries, electricity power plants, agricultures, markets as well as social factors such as coastal villages, schools and other public facilities. The existence of this strategic area is threatened by the potential for a tsunami disaster mainly from megathrust along the Southern Coast of Java Island. On 2006, a tsunami earthquake of M7.7 occurred off Pangandaran Regency with tsunami height of 5-8 meters and inundated about 500 meters along southern coast of West and Central Java Province. The tsunami caused more than 600 casualties and damage to buildings, public facilities and insfrastructure. Yet, the Indonesia National Earthquake Source and Hazard Map suggest a bigger threat of a plausible M8.7 – M9.2 megathrust earthquake off Java island. This research aims to analyze and map potential areas affected by the tsunami in the South Coast of West Java Province based on numerical modelling carried out with Cornell Multi-grid Coupled Tsunami Model (COMCOT) v1.7 based on the several megathrust earthquake scenarios in southern off West Java. The results of tsunami modelling show that the highest impact is generated in the Sunda Straits & West Java - Central Java Megathrust Scenarios with highest tsunami inundation and the fastest travel time occurred in Cianjur Regency with 26,7 meters height and estimated arrival time of tsunami wave approximately 10 minutes after the mainshock, while the farthest inundation distance is estimated in Sukabumi Regency about 5.8 kilometers from the coast due to existence of river. As an impact of tsunami in socio-economic aspect, Pelabuhan Ratu District in Sukabumi would be the most vulnerable due to high economic activities and number of inhabitants.
Keywords: Tsunami, Megathrust Earthquake, Southern Coast, West Java Province
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