2002年玉门5.9级地震序列精确定位和发震构造研究

Accurate Location of the 2002 Yumen, Gansu, M5.9 Earthquake Sequence and the Study on Its Generating Structure

用“双差法”对2002年12月14日甘肃玉门5.9级地震的主震和余震序列进行了重新精确定位,在此基础上讨论了本次地震的发震断层和发震机制。结果表明,在汇合处玉门断裂向深部延伸和旱峡—大黄沟断裂汇合在汇合处的断层面上发生逆推错动,造成这次主震和余震的能量释放。

The sequence of the Yumen M5.9 earthquake on December 14, 2002 was relocated using the double-difference earthquake location algorithm. Based on this the seismic fault and mechanism were discussed. The result shows that the inverse-push dislocation occurred on the fault plane at the convergence of the Yumen fault and the Hanxia-Dahuanggou fault in the depth, and both faults contributed to the energy release of the mainshock and aftershocks.