民乐-山丹地震序列的重新定位及发震构造分析  

Discussion on the causative structure and relocation of the Oct.25 2003 Minle-Shandan M 6.1 earthquake sequence

作　　者：李英 许康生 

机构地区：[1]甘肃省地震局,中国兰州730000

出　　处：《地震地磁观测与研究》2010年第2期31-36,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地震行业科研专项"面向灾后应用救援的地震参数快速测定技术的研究--震源几何参数测定技术"(200708031-1);中国地震局地震预测研究所基本科研业务费(青藏高原东北缘强震的全波场模拟)资助

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。In this paper, we relocated the Minle-Shadan M 6.1 earthquake sequence, including 81 aftershocks of ML〉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.

关 键 词：民乐-山丹地震 地震序列 重新定位 发震构造 

分 类 号：P315.2[天文地球—地震学]