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本文采用2012年5月28日唐山M_S4.8地震的宽频带波形资料,利用CAP方法反演得到该地震震源机制解和震源深度,在此基础上,结合多种深度震相对震源深度进行精确测定。结果显示:唐山MS_4.8地震是略带正断分量的走滑型地震。最佳双力偶解节面Ⅰ走向139°、倾角79°、滑动角-17°;节面Ⅱ走向232°、倾角73°、滑动角-169°;最佳震源深度为10km,属于浅源地震。从震中位置和震源机制解来分析,此次地震发震断层可能为唐山断裂。
Based on the broadband waveform data of the M_S4.8 earthquake in Tangshan on May 28, 2012, the focal mechanism solution and focal depth of the earthquake are retrieved by the CAP method. Based on this, the depth of relative focal depths of various depth shocks are accurately determined . The results show that the Tangshan MS 4.8 earthquake is a strike-slip earthquake with a slightly normal component. The best doubly coupled solution section Ⅰ is 139 °, inclined at 79 ° and sliding angle is -17 °. The section Ⅱ is inclined at 232 °, dip angle of 73 ° and sliding angle of -169 °. The optimal depth of focal point is 10 km, belonging to shallow source earthquake . According to the epicenter position and focal mechanism solution, the seismogenic fault of this earthquake may be the Tangshan fault.