[J09-P] Poster

[J09-P-07] Aftershock Observation of Mw 6.5 Pidie Jaya, Aceh, Indonesia Earthquake: Preliminary Results

^○Andri Dian Nugraha¹, Muksin Umar², Muzli Muzli³, Zulfakriza Zulhan⁴, Riskiray Ryannugroho¹, Kadek Hendrawan Palgunadi¹, Supendi Pepen³, Sri Widiyantoro¹, Nanang T Puspito¹, Wahyu Triyoso¹, Daryono Daryono¹, Kemal Erbas⁵, Rachmat Sule¹, Irwan Meilano¹, Mahsyur Irsyam¹, Philippe Jousset⁵ (1.Institut Teknologi Bandung, Bandung, Indonesia, 2.Syah Kuala University, Aceh, Indonesia, 3.Agency for Meteorology, Climatology and Geophysics (BMKG), Jakarta, Indonesia, 4.Department of Mining and Energy Resourcses, Aceh, Indonesia, 5.GFZ Postdam, German)

The Mw 6.5 Pidie-Jaya, Aceh, Indonesia earthquake occurred on December 7, 2006. This destructive event causing many victims, houses and infrastructure collapses as reported by the authority. The previous geological and geophysical studies did not show the fault surface indication around the mainshock, so it is very important to investigate the fault plane and source mechanism of the event. A week after, we deployed 9 seismometers to observed the aftershock distriburion. We carrefully picked P-and S-arrival time of the small event and then determined the hypocenter location. In total, we determined ~320 event for one month monitoring. Our preliminary results show the aftershocks location have striking of NE-SW direction with the focus depth of 10 to 30 km. These events cluster also appear perpendicular to the main Sumatra fault, so it is antithetic fault likely. The comparison with geological and geodetical studies are needed to get much better interpretation.

Keywords: Pidie-Jaya, earthquake, aftershock