2016年杂多MS6.2地震的InSAR形变及断层滑动模型

利用欧空局Sentinel-1A卫星的升轨观测，基于InSAR技术获取2016-10-17青海杂多地区MS6.2地震的同震形变场，并分别采用最速降法和三角元法反演地震的位错分布模型。结果表明，本次地震发生在杂多上拉秀断裂带，走向北东东，地震破裂以正断倾滑为主，兼具少许左旋走滑运动分量，最大滑移量0.17 m，震源深度为9 km，平均滑动角约为-76°，最大形变中心位于32.85°N、94.86°E附近，地震位错主要分布在深度8~12 km,与余震的深度分布较为一致，反演给出的矩震级为MW5.9，与USGS和CENC测定的矩震级和面波震级基本一致。

The Fault Slip Distribution of Zadoi MS6.2 Earthquake as Revealed by Sentinel-1A InSAR Data

We determine the coseismic displacement of the Qinghai Zadoi MS6.2 earthquake that occurred on October 17, 2016 using ascending InSAR data from the ESA’s Sentinel-1A satellite, and we obtain the fault distribution of the earthquake using the SDM method. The results show that there is large dip-slip in the fault concentrating in the depth between 8 km and 12 km, with a little strike-slip component. The maximum slip of 0.17 m is observed at a depth of 9 km and is located near 32.85°N, 94.86°E. The obtained focal depth is consistent with the aftershock and the inverted seismic magnitude is MW5.9, which is consistent with the USGS and CENC.