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本文采用CAP方法反演了2011年两次岷县中等地震的震源机制解,首先讨论了方位角对反演结果的影响,通过对不同方位角组合的比较,得到的结果比较稳定,进一步得出两次地震的震源机制解.然后,采用自助抽样(bootstrap)方法,基于CAP方法进行多次重复反演,得到岷县两次中等地震事件的大样本量震源机制解数据.基于这些大样本数据,以Kagan角为目标函数,利用粒子群非线性优化方法搜索震源机制解的优化解,并估计了震源机制解的误差范围,M_S4.0、M_S4.5的误差分别为6.0°和18.3°.结果分析表明,CAP结果与得到的优化解基本接近,其误差在可接受的误差范围内.
In this paper, the CAP method is used to invert the focal mechanism solutions of the two moderate earthquakes in Minxian County in 2011. Firstly, the effect of azimuth on the inversion results is discussed. By comparing the different azimuth combinations, the results obtained are more stable and further Then, using the method of self-sampling (bootstrap), repeated multiple inversion based on the CAP method was used to obtain large-sample focal mechanism solution data of two moderate earthquakes in Minxian.Based on these large sample data , The Kagan angle is taken as the objective function, and the optimal solution to focal mechanism solution is searched by using particle swarm optimization method. And the error range of focal mechanism solution is estimated. The errors of M_S4.0 and M_S4.5 are 6.0 ° and 18.3 °, respectively. The results show that the CAP results are basically close to the optimal solution, and the error is within the acceptable error range.