Deformation and Source Parameters of the 2015 Mw 6.5 Earthquake in Pishan, Western China, from Sentinel-1A and ALOS-2 Data

Remote Sensing

Guoyan Jiang¹  Yangmao Wen²  Caijun Xu²  Yang Liu² 

[1] Collaborative Innovation Center of Geospatial Technology, Wuhan University, Wuhan 430079, China;School of Geodesy and Geomatics,Wuhan University, Wuhan 430079, China;

关键词: radar interferometry;    Tibetan Plateau;    Pishan earthquake;    rupture model;    thrust faulting;    seismic hazard;   

DOI  :  10.3390/rs8020134

来源: DOAJ

【 摘 要 】

In this study, Interferometric Synthetic Aperture Radar (InSAR) was used to determine the seismogenic fault and slip distribution of the 3 July 2015 Pishan earthquake in the Tarim Basin, western China. We obtained a coseismic deformation map from the ascending and descending Sentinel-1A satellite Terrain Observation with Progressive Scans (TOPS) mode and the ascending Advanced Land Observation Satellite-2 (ALOS-2) satellite Fine mode InSAR data. The maximum ground uplift and subsidence were approximately 13.6 cm and 3.2 cm, respectively. Our InSAR observations associated with focal mechanics indicate that the source fault dips to southwest (SW). Further nonlinear inversions show that the dip angle of the seimogenic fault is approximate 24°, with a strike of 114°, which is similar with the strike of the southeastern Pishan fault. However, this fault segment responsible for the Pishan event has not been mapped before. Our finite fault model reveals that the peak slip of 0.89 m occurred at a depth of 11.6 km, with substantial slip at a depth of 9–14 km and a near-uniform slip of 0.2 m at a depth of 0–7 km. The estimated moment magnitude was approximately Mw 6.5, consistent with seismological results.

【 授权许可】

Unknown