基于InSAR形变观测反演2015年皮山M_S6.5地震滑动分布

发布时间：2018-09-17 12:43

【摘要】：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。
[Abstract]:The M_S6.5 earthquake occurred on July 3, 2015 in Pishan County, Xinjiang. In this paper, the source mechanism of the earthquake is inversed by using the Sentinel-1A satellite differential interferometry data provided by ESA. Firstly, the differential interference processing of satellite radar image is carried out by using the two-orbit method. The coseismic deformation field covering the Pishan earthquake area is obtained, and then the geometric parameters of the seismogenic fault are obtained by using the uniform sliding model of elastic half-space, and the original observation data are down-sampled and processed. On this basis, a more precise fault slip distribution is obtained by using the distributed sliding model inversion. The results show that the distributed sliding model has a high degree of fit with the observed results. The inversion results show that the seismogenic fault is a blind fault dominated by thrust and a small amount of left lateral strike-slip. The distribution of co-seismic activity in the fault plane of this earthquake is mainly in the 7~15km depth range. The seismic moment of co-earthquake is 6.28 脳 10 ~ (18) N m, moment magnitude MW 6.46, which is very consistent with the previous results.
【作者单位】：中国地震局第二监测中心;新疆维吾尔自治区地震局;
【基金】：国家自然科学基金项目(41604015) 地震科技星火计划项目(XH17059)联合资助
【分类号】：P315.3

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