由多个震源机制解分析甘肃及边邻地区应力场特征  

Characteristics Analysis of the Stress Field in Gansu and Its Adjacent Region with Various Focal Mechanism Solutions

作　　者：张辉[1] 刘小凤[1] 赵凌云[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《华南地震》2007年第2期33-39,共7页South China Journal of Seismology

基　　金：国家科技支撑计划资助(2006BAC01B03-04-02)

摘　　要：基于震源断层面解的空间取向和断层滑动方向,由相应力轴张量在地理坐标系中的表达式,通过坐标旋转、代数平均可求得多个震源机制解的P、B、T轴参数的平均应力场。据甘肃及边邻地区的分区活动特征,将研究地区分为8个小区域,由各个区域内多个地震震源机制解,采用力轴张量计算法,得到了各个区应力张量的定量分析结果。Based on the spatial orientation and slip direction of the fault plane solutions, by means of the expression of corresponding mechanical axis tensor in geographic coordinate system and the coordinate clrcumrotating and algebra average, we deduced the mean stress field from P, B and T axes parameters of a number of focal mechanism solutions. According to the subarea activity characteristics of Gansu and its adjacent region, the region concerned is divided into eight small areas. From a number of focal mechanism solutions in every area, adopting the method of mechanical axis tensor, we presented the quantitative analysis results of the stress tensor in each area.

关 键 词：震源机制 力轴张量 平均应力场 

分 类 号：P315.33[天文地球—地震学]