Analysis of coseismic fault slip models of the 2012 Indian ocean earthquake: Importance of GPS data for crustal deformation studies
Gunawan E.a, Maulida P.a, Meilano I.a, Irsyam M.a, Efendi J.b
a Graduate Research on Earthquake and Active Tectonics, Faculty of Earth Science and Technology, Bandung Institute of Technology, Bandung, Indonesia
b Geospatial Information Agency, Cibinong, Indonesia
Abstract
© 2016 Institute of Geophysics, Polish Academy of Sciences 2016.Based on continuous GPS data, we analyze coseismic deformation due to the 2012 Indian Ocean earthquake. We use the available coseismic slip models of the 2012 earthquake, derived from geodetic and/or seismic waveform inversion, to calculate the coseismic displacements in the Andaman-Nicobar, Sumatra and Java. In our analysis, we employ a spherical, layered model of the Earth and we find that Java Island experienced coseismic displacements up to 8 mm, as also observed by our GPS network. Compared to coseismic offsets measured from GPS data, a coseismic slip model derived from multiple observations produced better results than a model based on a single type of observation.
Author keywords
Co-seismic displacement,Coseismic deformation,Coseismic slips,Crustal deformations,Fault-slip model,Indian ocean,Model-based OPC,Seismic waveform inversion
Indexed keywords
coseismic deformation,GPS displacement,the 2012 Indian Ocean earthquake