M.L. Hakim¹ , T. Yatimantoro¹

¹Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG), National Seismological Center, Jakarta, Indonesia

Abstract:

The M 7.8 Southwest of Sumatra earthquake that occurred in the Indian ocean on 2 March 2016 was around 682 km from Mentawai Island. The USGS reported that the earthquake occurred at 12:49 UTC, 4.908°S – 94.275°E, with a depth of 24 km. The earthquake felt by people in Padang city and surroundings area. This intraplate earthquake had a strike-slip faulting mechanism and generate the small tsunami. To investigate tsunami in detail, we make numerical tsunami modelling. We estimates the fault length was 200 km and the width was 80 km. We used focal mechanism parameter from W-Phase inversion with strike, dip, rake = 274°, 84°, 169° respectively. To validate our result, we used the tsunami wave that was recorded by Indian Ocean coastal sea level gauges; they are Cocos, Christmas Islands, Tanahbala, Gan, Male, and Hanimadhoo.