新疆南天山环境应力场特征  

CHARACTERISTICS OF THE ENVIRONMENTAL STRESS FIELD IN SOUTH TIANSHAN OF XINJIANG

作　　者：吕桂林[1] 韩京[1] 陈培善[2] 

机构地区：[1]新疆维吾尔自治区地震局,乌鲁木齐830011 [2]国家地震局地球物理所,北京100081

出　　处：《内陆地震》1997年第3期212-217,共6页Inland Earthquake

摘　　要：基于新疆强震固定台和流动观测记录的主震和余震加速度资料，选用了三个分向记录都完整的37次地震。震级范围为1．8～6．8级，震中距为几至几十公里（个别为100多公里）。根据用位错理论二维断裂力学模式推导的震源峰值、加速度与环境剪应力场关系式计算了新疆南天山环境剪应力值。计算结果表明，新疆南天山环境剪应力平均值偏高，这与新疆处于特殊构造环境条件有关。The 37 earthquakes with complete 3-component records are selected from the acceleration data of the mainshocks and the aftershocks recorded by Xinjiang seismic network;Their magnitudes are between 1. 8 and 6. 8,and epicentral distances are within 100 km(only one or two are more than 100 km). Based on the expression of the relation among focal peak value,acceleration and environmental shear stress field, the environmental shear stress values in South Tianshan,Xinjiang are calculated. The result shows that the mean shear stress values are relatively high in this area,which is concerned with the special tectonic setting of Xinjiang.

关 键 词：最大剪应力 构造应力场 环境构造 新疆 

分 类 号：P554[天文地球—构造地质学]