华北北部地区震源机制解及构造应力场特征分析

摘要

With 848 M1≥2.0 focal mechanisms which occurred during in January ,2002 to June 2010 in northern part of North China,and according to regional tectonic feature, the area is divided into four studied regions to analyze the focal mechanism features of each partitions and to research stress field feature parted by 1 ° x 1 °and with 0.5°slip trapeze zone. The results show that the maximum principle stress orientation of various studied partitions all is NEE, the minimum principle stress orientation is NNW, they are basically consistent with the direction of tectonic stress field in North China. The stress structures of various partitions all are of strike-slip type, the principle feature of tectonic stress field in northern part of North China is horizontal stress action, the way of focal strain-slip way is strike-slip mainly.%利用华北北部地区2002-01 -2010-06月848个Ml≥2.0地震的震源机制解,根据区域构造活动特征将其划分为4个研究区,分析各研究区震源机制解特征,并采用1°×1°的网格,0.5°滑动分区的方法对华北北部地区各研究区和空间滑动进行应力场特征研究.结果表明,各研究区的最大主应力的方位为NEE向,最小主应力方位为NNW向,与华北地区区域构造应力场方向较一致.各研究区的应力结构均为走滑型,水平应力作用为华北北部地区构造应力场的主要特征,震源错动方式以水平走滑为主.