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2015年7月3日在新疆皮山县发生了M_S6.5地震,该地震使当地遭受了巨大的经济损失。本文利用欧空局提供的Sentinel-1A卫星差分干涉数据对该地震的震源机制情况进行了反演研究,首先运用两轨法对卫星雷达影像进行差分干涉处理,获取了覆盖皮山地震震区的同震形变场,然后利用弹性半空间的均匀滑动模型反演获取了发震断层的几何参数,并对原始观测数据进行降采样处理,在此基础上运用分布式滑动模型反演获取了更为精细的断层滑动分布,结果显示分布式滑动模型与观测结果有很高的拟合度。反演结果表明发震断层是一个以逆冲为主兼有极少量左旋走滑的盲断层,此次地震断层面的同震活动分布主要集中在7~15km深度范围内,同震的地震矩为6.28×10~(18) N·m,矩震级为M_W6.46,与前人的研究结果非常一致。
On July 3, 2015, an M_S6.5 earthquake struck Pishan County, Xinjiang, which caused huge economic losses to the area. In this paper, we use the Sentinel-1A satellite differential interference data provided by ESA to invert the focal mechanism of the earthquake. First, the two-track method is used to perform differential interference processing on the satellite radar image, and the seismic coverage over the Pishan earthquake is obtained Coseismic deformation field. Then the geometrical parameters of the seismogenic fault are obtained by inversion of the uniform sliding model in the elastic half-space, and the original observation data are downsampled. Based on this, the distributed sliding model is used to obtain the more The fine fault slip distribution shows that the distributed slip model has a good fit with the observed results. The inversion results show that the seismogenic fault is a blind fault mainly thrusting with a small amount of left-lateral strike-slip. The distribution of the coseismic activity of the fault surface mainly lies in the depth of 7-15 km, and the seismic moment Is 6.28 × 10 ~ (18) N · m, moment magnitude is M_W6.46, which is in good agreement with previous research results.