Abstract
Indonesia is at the confluence of three large plates, so it often experiences earthquakes. Therefore, earthquake disaster mitigation efforts must be increased. One of the efforts that can help the government prepare a disaster mitigation system for earthquakes and their associated disasters is research on fault deformation. This research utilizes continuous data from the Global Navigation Satellite System (GNSS), especially the Global Positioning System (GPS), which is processed into surface deformation. The crustal deformation was modeled based on the Okada formulation with estimated earthquake parameters and then verified with surface deformation to obtain optimal parameter values. Automation is carried out with a computerized system to speed up the estimation process, and more optimal results are obtained using the Hooke-Jeeves numerical method. We do modeling for tectonic earthquakes in Sumatra during 2005 and 2007 with magnitudes > 8 Mw. The modeling results were validated with seismic data and seismological theory of the seismic moment. The success of this modeling can be taken into consideration in earthquake prediction as part of an earthquake disaster mitigation system.
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