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Coseismic Slip from the 6 October 2008, M w6.3 Damxung Earthquake, Tibetan Plateau, Constrained by InSAR Observations |
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| Authors: | Xuejun Qiao Shaomin Yang Ruilin Du Linlin Ge Qi Wang |
| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing, China 2. Institute of Seismology, China Earthquake Administration, Wuhan, China 3. School of Surveying and Spatial Information Systems, The University of New South Wales, Sydney, Australia |
| Abstract: | Coseismic deformation fields of the 6 October 2008 M w6.3 Damxung earthquake were obtained from interferometric synthetic aperture radar by using three descending and two ascending Envisat images. Significant coseismic surface deformation occurred within 20?km?×?20?km of the epicenter with a maximum displacement of ~0.3?m along the satellite line of sight. We model a linear elastic dislocation in a homogeneous half space and use a nonlinear constraint optimized algorithm to estimate the fault location, geometry and slip distribution. The results indicate a moment magnitude M w6.3, and the earthquake is dominated by oblique normal and right-lateral slip with a maximum slip of 2.86?m at depth of 8?km. The rupture plane is about 15?km?×?14?km with strike S190°W and dip 55° to NW, located at a secondary fault of the Southeastern Piedmont of the Nyainqentanglha Mountains. Slip on normal faults in the Tibetan Plateau contributes to the rift evolution. |
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