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首都圈地区震源机制解综合研究
武敏捷1, 武安绪1, 徐平1, 林向东1, 董鸿燕1, 辛雪侠1, 李腊月2
1.北京市地震局,北京市海淀区苏州街28号100080;2.中国地震局地震预测研究所,北京100036
摘要:
对首都圈地区2002年1月~2010年6月619个ML≥2.0地震的震源机制解的基本特征进行了统计分析,并且依据区域构造特征将首都圈划分为3个区域,用聚类统计方法中的最长距离法对各分区的机制解进行了聚类分析,研究了各分区的构造应力张量特征。研究结果表明,首都圈地区震源机制解P轴方位的优势分布为NNE-NEE向,T轴方位的优势分布为NNW-NWW向,绝大多数地震震源处的应力场以水平作用为主,破裂以水平走滑为主。首都圈西部最大主压应力方位为NE75°,中部最大主压应力方位为NE62°,东部最大主压应力方位近EW向,区域构造应力场以水平向挤压为主要特征。
关键词:  震源机制解 系统聚类 应力张量 首都圈
DOI:
分类号:
基金项目:地震科技星火计划(XH12001)、北京市地震局专项和2013年震情跟踪合同制定向工作任务(2013020109)联合资助
Comprehensive research on focal mechanism solutions in the Capital Area
Wu Minjie1, Wu Anxu1, Xu Pingt1, Lin Xiangdong1, Dong Hongyan1, Xin Xuexia1, Li Layue2
1.Earthquake Administration of Beijing Municipality, Beijing 100080 ,China;2.Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China
Abstract:
A comprehensive statistical analysis was made on the basic features of focal mechanism solutions of 619 ML≥2. 0 quakes from January, 2002 to June 2010 in the Capital Area which was divided into three studying regions in terms of regional tectonic characteristics. The paper conducted a clustering analysis on focal mechanisms of all partitions using the longest distance method of clustering statistical, and studied the characteristics of tectonic stress tensor. The result shows that advantage distribution of P-axis is NNE-NEE and T-axis is NNW-NWW. Most of the hypocentrals are mainly horizontal stress action. Rupture is mainly horizontal strike-slip. The maximum principle compressional stress orientation is NET5° in the west of the Capital Area, NE62° in the middle of the Capital Area, and near EW in the east of the area. The main characteristic of the region tectonic stress field is of horizontal extrusion.[著者文摘]
Key words:  Focal mechanism Systematic cluster Stress tensor The Capital Area