姚安地震序列与永胜地震序列的高精度定位  

Accurate Location on the Yao'an Earthquake Sequence and the Yongsheng Earthquake Sequence

作　　者：王新岭[1] 刘杰[2] 张国民[1] 赵翠萍[3] 

机构地区：[1]中国地震局地震预测研究所,北京市复兴路63号100036 [2]中国地震台网中心,北京100036 [3]中国地震局地球物理研究所,北京100081

出　　处：《中国地震》2005年第3期386-397,共12页Earthquake Research in China

基　　金：国家重大基础研究前期专项(2002CCD01700);"十五"地震预报科技攻关项目(2004BA601B010403)

摘　　要：2000年1月15日云南省姚安地区发生了MS6.5地震,2001年10月27日云南永胜地区发生了MS6.0地震,两者均位于滇中块体,震中相距较近,构造相似,且各自都有丰富的余震活动。为深入研究姚安、永胜两地震的主震及余震序列的分布与破裂特征,根据云南省地震局布设的流动数字台网记录到的余震序列的震相资料,分别联合采用盖格定位法和双差定位法得出了这两个余震序列的时空分布。在此基础上,联合昆明区域台网记录的两个主震和较大余震的震相资料,利用双差定位法重新校正了姚安和永胜两次主震的震源参数。根据地震序列的时空分布,结合两个地震区的地质构造、所属块体的受力状态等特征,对比分析了两个地震余震序列沿断层面破裂的特点。The Yao＇an Ms6.5 earthquake on Jan. 15, 2000 and the Yongsheng Ms6.0 earthquake on Oct,27,2001 are in middle part of the Yunnan block. Their epicenters were close, the tectonic and strain characteristics of earthquake region were similar, and there are many aftershocks after the two main shocks. In order to study the spatial-temporal distribution and fault rapture characteristies of the main shocks and the aftershocks, the Yao＇an and Yongsheng earthquake sequences were located using the Geiger earthquake location algorithm and double difference earthquake location algorithm based on the seismic phase data of the two earthquake sequences, which was recorded by the two Near Source Digital Seismic Networks deployed by the Seismological Bureau of Yunnan Province after the main shocks. And then the hypocenters and origin times of two main shocks were relocated using the double difference earthquake location algorithm based on the data of the larger magnitude aftershocks and the main shocks that was recorded by the Kunming Regional Digital Seismic Network and Near Source Digital Seismic Networks. Combining the spatial-temporal distributions of the two main shocks and aftershocks, the tectonic and the strain characteristics of earthquake region, the rupture process of earthquake sequences along the faults after the main shocks were compared, analyzed and discussed.

关 键 词：双差定位法 地震序列 断层 地震能量 

分 类 号：P315[天文地球—地震学]