Abstract In this study, InSAR data from Sentinel-1 satellite are used to image the coseismic deformation and constrain the focal mechanism of the MW6.3 earthquake that struck Jinghe county, in the central segment of the Tien Shan Orogenic system, northwestern China, on 9th August 2017. After the orbit and atmospheric error are corrected in the coseismic interferogram, we find a maximum surface displacement in line of sight (LOS) up to 7 cm, and no surface rupture in this event. Assuming an elastic homogeneous half-space, a two-step inversion strategy is adopted to inverse the fault geometry and slip distribution, respectively. Our results demonstrate this event is dominated by thrust-slip with no strike-slip, and the main slip zone is in depths of 8 to 17 km with a maximum slip of 0.6 m, suggesting this event is a blind reverse thrust rupture with one asperity. The seismic moment determined in this study is 2.91×1018 Nm, corresponding to MW6.25, which is consistent with the focal mechanism from USGS and CENC.
SHI Heqing,ZHANG Zhanbiao,CHEN Yunguo et al. Constraints on Coseismic Rupture Model of the 2017 MW6.3 Jinghe Earthquake from InSAR Data[J]. jgg, 2019, 39(11): 1106-1111.
SHI Heqing,ZHANG Zhanbiao,CHEN Yunguo et al. Constraints on Coseismic Rupture Model of the 2017 MW6.3 Jinghe Earthquake from InSAR Data[J]. jgg, 2019, 39(11): 1106-1111.