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2017年8月8日四川九寨沟县发生M_S7.0地震。根据中国地震台网固定台站的记录波形,利用gCAP方法和P波初动符号反演方法求解了主震的震源机制解,其结果与哈佛CMT震源机制解、美国地质勘探局发布的震源机制以及中国地震局发布的各震源机制解有很好的一致性。此外,还求解了九寨沟地震震中附近2010—2016年间28次小震的震源机制解,利用得到的小震震源机制解反演了该区域的构造应力场。结果表明,这一区域构造应力场的最大应力轴与最小应力轴均为水平方向,其中最大应力轴方向为NWW方向,最小应力轴方向为SSW方向。
August 8, 2017 M_S7.0 earthquake occurred in Jiuzhaigou County, Sichuan Province. According to the recorded waveforms of the fixed stations in China Seismological Station, the focal mechanism solution of the main shock was solved by using the gCAP method and the P wave initial sign inversion method. The results are consistent with the focal mechanism solutions of the Harvard CMT, the focal mechanism released by the US Geological Survey As well as the focal mechanism solutions released by the China Seismological Bureau have very good consistency. In addition, focal mechanism solutions of 28 minor earthquakes during 2010-2016 near the epicenter of the Jiuzhaigou earthquake were also solved, and the tectonic stress field in this area was solved using the acquired focal mechanism of small earthquakes. The results show that both the maximum stress axis and the minimum stress axis of the tectonic stress field in this area are horizontal, with the NWW direction in the direction of maximum stress axis and the SSW direction in the direction of the minimum stress axis.