COSEISMIC ANALISYS 2007 SIANOK EARTHQUAKE BASE ON GPS OBSERVATION FROM 1993-2007

• Main Author: EFENDI (NIM: 25113008), JONI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22713
• Institution: Institut Teknologi Bandung

Sumatra island is a part of Eurasian plate that has convergence interraction with <br /> <br /> <br /> <br /> Indo-Australian plate. Oblique subduction between those plates forming a <br /> <br /> <br /> <br /> subduction zone in the western part of the Sumatran island and fault segments <br /> <br /> <br /> <br /> onshore Sumatra island. Those subduction zones and fault segments often cause <br /> <br /> <br /> <br /> earthquakes in the region. <br /> <br /> <br /> <br /> Since the introduction of the Indonesia Geospatial Reference System 2013 <br /> <br /> <br /> <br /> (IGRS2013) as a geodetic datum for mapping activity in Indonesia, the change of <br /> <br /> <br /> <br /> reference frame position as a function of time due to the dynamics of the earth needs <br /> <br /> <br /> <br /> to be taken into account. The occurrence of two consecutive earthquakes on March <br /> <br /> <br /> <br /> 6, 2007 in the Lake Singkarak, West Sumatra (Sianok Earthquake), lead a coseismic <br /> <br /> <br /> <br /> deformation that affect the IGRS2013. In this study, an analysis performed to <br /> <br /> <br /> <br /> determine the most appropriate co-seismic deformation model of the Sianok <br /> <br /> <br /> <br /> earthquake and the extent of its impact on IGRS2013. <br /> <br /> <br /> <br /> Based on the analysis of validation residual value at 11 GPS stations, can be <br /> <br /> <br /> <br /> concluded that the most appropriate co-seismic deformation model of the Sianok <br /> <br /> <br /> <br /> earthquake is the model developed using earthquake parameter data derived from <br /> <br /> <br /> <br /> Global CMT with residual misfit 47.5 mm. The magnitude of the coseismic <br /> <br /> <br /> <br /> deformation does not affect the 1:1000 scaled map. However, it will affect the <br /> <br /> <br /> <br /> position (coordinate) of the sorounding Geodesy Control Network (GCN). So, the <br /> <br /> <br /> <br /> GCN coordinates must be updated.