Abstract We analyze the Ms6.0 earthquake in Jinghe on November 1, 2011 and the Ms 6.6 earthquake on the border of Xinyuan and Hejing on June 30, 2012. We identify earthquakes with magnitude greater than ML3.0 since Jan 2009, in a range of 100 km around these two earthquakes. We use CAP method and first motion direction about P-wave inverse the focal mechanism solution, then do a cluster analysis for these focal mechanism solutions. Our study shows that, about six months before the main-shock, the earthquakes’ fault nature changes from disorder to order; the maximum compressive principal stress P-axis azimuth changes from random to prominent, which is consistent with the direction of main-shock’s step by step.
GAO Chaojun,NIE Xiaohong,ZHANG Zhipeng et al. The Abnormal-Characteristics of Cluster Analysis before the Two Ms6.0 Earthquakes that Occurred in Middle of Mount Tianshan[J]. jgg, 2016, 36(5): 446-.
GAO Chaojun,NIE Xiaohong,ZHANG Zhipeng et al. The Abnormal-Characteristics of Cluster Analysis before the Two Ms6.0 Earthquakes that Occurred in Middle of Mount Tianshan[J]. jgg, 2016, 36(5): 446-.
