【摘要】 利用甘肃遥测台网2013年7月22日至9月22日的震相观测报告,对2013年7月22日07时45分甘肃省岷县漳县交界M_S 6.6地震的地震序列进行双差定位研究。结果表明,地震序列呈北西向分布,与临潭—宕昌断裂的走向基本一致,地震分布长度约10 km。震源深度剖面显示断层面向西南倾斜,浅部倾角较陡,深部略缓,表现为"铲形"逆冲断层的特征。余震区存在一条向西南延伸的余震带,与发震断层相交成y字型,推测可能是逆冲推覆构造中常见的反冲断层。更多还原

【Abstract】 Using the seismic phase observation reports from Gansu remote monitoring networks from July 22 to September 22 in 2013,the earthquake sequences of the Minxian-Zhangxian M_S 6.6earthquake(occurred at 07:45 on July 22,2013) in Gansu Province are relocated by double difference algorithm.The results show that the earthquake sequences are distributed approximately 10 km in length in NW direction,which is basically consistent with the strike of the Lintan-Tanchang fault.According to the focal depth profiles,the fault planes dip to the northwest,and the dip angle is steep in the shallow crust and gentle in the deep crust,manifesting itself as a listric thrust fault.A southwestward tilt aftershock belt is revealed intersecting with the seismogenic fault with y-shape,which is speculated as a back thrust fault that often appears in a thrust fault system.更多还原