【摘要】 2016年1月21日,青海省门源县发生Ms6.4级地震。不同机构、学者依据不同方法和资料计算得到该地震的震源机制解,由于采用的方法和选择的资料不同,所求解的震源机制解存在着一定的差别。为了在多个震源机制解中确定一个震源机制解进行后续分析,采用最小空间旋转角表达了2个震源机制的差别,将待定震源机制与所有震源机制的最小空间旋转角的平方和作为目标函数,并且采用Levenberg-Marquardt方法求解,使其与所有收集的震源机制解的差别的平方最小,这些震源机制结果就是多个震源机制解的中心解,同时给出标准差,选取标准差最小的中心解作为最终结果。根据这种方法,已知多个该地震的震源机制中确定中心解,从而对其他诸如应力触发、地球动力学分析等提供后续分析。更多还原

【Abstract】 After Menyuan Ms6.4 earthquake in Qinghai province, the focal mechanism solutions are derived from different data and methods. The differences of focal mechanism solutions are exist for derivation from various data set and methodology. In order to determine an appropriate focal mechanism solution from several focal mechanisms of the same earthquake for later geodynamic analysis, the difference between the two focal mechanisms is expressed by the minimum 3-D rotation angle. The sum of the square of the minimum 3-D rotation angles between the pending focal mechanism solution and all the focal mechanism solution as an objective function, the Levenberg-Marquardt approach and the standard deviation is given in the paper. The center of focal mechanism solutions with the smallest standard deviation is selected as the final result. The center of focal mechanism solutions of Menyuan Ms 6.4 earthquake are given by using this method. The result can be used for other studies such as seismic stress triggering, geodynamic analysis, etc.更多还原