【摘要】 利用甘肃地震台网的资料,对2003年10月25日发生在甘肃省的民乐-山丹Ms 6.1地震及81例M_L>2.5余震,采用单纯型定位法进行了重新定位。结果表明,对这个地震序列的定位结果与震后实地考察给出的烈度图非常吻合。根据该定位结果,对这次主震的发震构造进行分析,认为第一主震发生在童子坝河隐伏断裂带上,附近的民乐-永昌隐伏断裂带参与了其后一系列余震。更多还原

【Abstract】 In this paper, we relocated the Minle-Shadan M 6.1 earthquake sequence, including 81 aftershocks of M_L>2.5, with earthquake Pg phase data on 6 stations.Using the simplex algorithm of earthquake location, we got basic parameters of them.The result of relocation shows that the fitness between the distribution of aftershocks and the seismic intensity map. Based on this result, the causative structure of main shock and the earthquake sequence are discussed.We think the causative structure of main earthquake is Tongziba river buried fault.Other buried fault (Yongchang-Minle buried fault) involves the action of after earthquakes.更多还原