Deformation analysis for Padang earthquake using GPS data

Abstract

On September 30, 2009, an Mw 7.6 earthquake occurred off the coast of Sumatra. This earthquake caused deformation in the area around the center of the earthquake. Surface deformation in the area around the epicenter was Analyzed carried out using GPS data from the SuGAr (Sumatran GPS Array) network. The observed SuGAr stations were TIKU, PSKI, NGNG and MSAI. Data processing used GAMIT/GLOBK software. GPS data were observed for 100 days before and after the main earthquake occurrence. The measurement results indicate that the MSAI and NGNG stations in Mentawai deformed towards the south-weast direction, varies between 38 - 50 mm, and TIKU and PSKI stations on the mainland of Sumatra were deformed in north-west directions, varies from 5 - 12 mm. This indicates that this Earthquake deformed the area of Western Sumatra and nearby Mentawai regions, in Siberut Island.