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[P-35] Comprehensive Investigation of active faults and its impacts in South East Aceh Region

*Muksin Umar^1,2, Ibnu Rusydy¹, Wiwik Ayu Ningsih^1,2, Andrean Simanjuntak^1,3, Arifullah Arifullah^1,2, Yunita Idris¹, Irwandi Nurdin^1,2 (1. Tsunami and Disaster Mitigation Research Center (TDMRC), Universitas Syiah Kuala, Banda Aceh, Indonesia, 2. Department of Physics, Universitas Syiah Kuala, Banda Aceh, Indonesia, 3. Mata Ie Geophysical Station of BMKG Aceh, Aceh Besar, Indonesia)

Keywords:active faults, loss analysis, seismic vulnerability, Aceh

The active fault system in South East Aceh seems to be complicated seems several earthquakes have occurred in different zones within the area. However, the faults system of the area has not been studied in detail whereas it is important to hazards within an area before proposing a mitigation concept. Therefore, we propose to investigate the active faults system and its impact by using several different methods. We deployed 7 seismometers combined with permanent broadband BMKG stations to record earthquakes. The recorded earthquakes were relocated by using coupled hypocentre-velocity inversion to delineate active faults. We found 3 earthquake clusters delineating the active faults namely, Lokop, Pining, and Alas. We also investigated the seismic vulnerability and structure of the area by using H/V method and found the area along the Kutacane Basin seems to be more vulnerable. Based on the distribution of the fault, structure, and vulnerability values we analyse the potential loss if earthquakes occur by using GIS based method and found the potential loss correlate with the location of faults and seismic vulnerability values.