Abstract
GPS data in southern Sumatra, Indonesia, indicate crustal deformation associated to subduction zone and inland fault of Great Sumatran Fault (GSF). We analyze these deformation characteristics using campaign and continuous GPS data available in southern Sumatra from 2006–2014. After removing the effect of GSF in southern Sumatra and coseismic displacements of 2007 Bengkulu and 2012 Indian Ocean earthquake, we find that GPS sites experienced northwest-ward direction. These GPS velocities correspond to postseismic deformation of the 2007 Bengkulu earthquake and the 2012 Indian Ocean earthquake. We analyze strain using these velocities, and we find that postseismic strains in southern Sumatra are in the range of 0.8–20 nanostrain.
Correction Note
Correction added after online publication April 06, 2016: Figure 5 was mistakenly similar to Figure 4 and was replaced.
Acknowledgments
This study was partially funded by the Australian Department of Foreign Affairs and Trade (DFAT) for Graduate Research on Earthquake and Active Tectonics at the Bandung Institute of Technology and Indonesia Endowment Fund for Education (LPDP) No. PRJ-1048 / LPDP / 2015. We thank BIG (Geospatial Information Agency), EOS (Earth Observatory of Singapore), and LIPI (Indonesia Institute of Sciences) that have provided relevant data related to this study. We are grateful to two anonymous reviewers for their thoughtful comments and constructive suggestions, which help to improve the quality of this manuscript. Figures were drawn using GMT software [21].
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