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利用晋冀蒙危险区临时虚拟台网的宽频带数字化观测资料,采用CAP(Cut and Paste)方法计算得到2016年6月23日河北尚义地震的震源机制解。节面Ⅰ:走向247°、倾角62°、滑动角-32°;节面Ⅱ:走向353°、倾角62°、滑动角-147°,震源深度8km,震级M_W3.93。结合地质构造隐伏断层推断,该地震可能是NNE向的大满—前黑沙土隐伏断裂构造引起的,发震断层性质为左旋、走滑兼有正断分量。
Based on the digitalized broadband observation data of the temporary virtual station network in the danger zone of Jin-Ji-Meng region, the focal mechanism solution of the Shangyi earthquake in Hebei on June 23, 2016 was calculated using the CAP (Cut and Paste) method. Face Ⅰ: 247 °, dip 62 °, sliding angle -32 °; section Ⅱ: 353 ° heading, dip 62 °, sliding angle -147 °, focal depth 8km, magnitude M_W3.93. According to the concealed fault of geological structure, this earthquake may be caused by the NNE-trending Manchu-former black sand buried fault structure, and the seismogenic fault is of L-strike and strike-slip with both positive and negative components.