【摘要】 利用遗传算法对2003年10月25日甘肃民乐—山丹6.1、5.8级地震及其余震进行了精确定位,并在此基础上结合地质资料讨论了此次地震的发震构造。定位结果表明:地震序列分布集中,两次主震主要沿着民乐—永昌隐伏断裂分布;震源深度主要分布在10～15km范围内,平均深度为12.1km;此次地震序列的发震构造为民乐—永昌隐伏断裂与童子坝河隐伏断裂所组成的大黄山隆起区前缘逆冲断裂,其中民乐—永昌隐伏断裂西段的NWW向局部断裂起主要作用。更多还原

【Abstract】 Two earthquakes(M6.1,5.8) occurred in Minle-Shandan,Gansu,on Oct.25,2003.In order to obtain the accurate locations of the earthquake sequence,we used Genetic Algorithm to relocate it,and discussed its seismogenic structure combining with geologic data.The result shows that the sequence distributes centrally,and two mainshocks distribute along the Minle-Yongchang concealed fault.The focal depths range mainly from 10 km to 15 km,the average 12.1 km.The seismogenic structure is the thrust of the Dahuangshan frontal uplifts constituted by the Minle-Yongchang concealed fault and Tongzibahe concealed fault,and the west segment of the NNW-trending Minle-Yongchang concealed fault is main seismogenic structure.更多还原