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分别选取2011-11-01精河Ms6.0地震和2012-06-30新源-和静Ms6.6地震自2009-01以来100km范围内ML3.0以上地震,使用CAP和P波初动方法计算震源机制解,并对主震前震源机制解进行聚类分析。结果表明,震中附近震前半年左右,震区周围地震断层性质逐渐由紊乱变为统一;最大主压应力P轴方位由随机逐步呈现相对突出方向,且逐步与主震方向一致。
We select the Jinghe MS6.0 earthquake of 2011-11-01 and the ML3.0 earthquake of the magnitude of ML100.0 within the range of 100km since 2009-01 for the 2012-06-30 Xinyuan-Hejing Ms6.6 earthquake. Focal mechanism solutions are calculated and cluster analysis is performed on focal mechanism solutions prior to the main shock. The results show that the dislocation of the seismic fault around the earthquake area gradually changes from disorganization to unity in the first half year before the epicenter. The P-axis azimuth of the maximum principal compressive stress gradually presents the relative prominent direction randomly, and gradually agrees with the direction of the main shock.