天山地震带应力状态分析  

STRESS STATE ANALYSIS OF TIANSHAN SEISMIC ZONE

作　　者：雷啸宇 聂晓红[2] 马学军[1] 赵鹏毕 沙木哈尔·叶尔肯 LEI Xiao-yu;NIE Xiao-hong;MA Xue-jun;ZHAO Peng-bi;Shamuhaer Yerken(Xinyuan Seismic Station of Earthquake Agency of Xinjiang Uygur Autonomous Region,Xiayuaa 335800,Xinjiang,China;Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局新源地震台,新疆新源835800 [2]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2021年第2期185-194,共10页Inland Earthquake

基　　金：新疆地震科学基金(201822)。

摘　　要：以天山地震带520次地震震源机制解数据为基础,应用MSATSI软件包中阻尼最小二乘反演该地区构造应力场的空间分布状态。结果表明,天山地震带主要受到近NS向挤压应力作用,其最大主压应力轴方向从东到西呈NNE―N―NNW向的渐变过程,北天山地震带主应力方向大范围为NS向,乌鲁木齐周边及以东地区为NNE向;南天山地震带西段最大主应力方向为NNW向,东段为NNE向,但西段中的喀什―乌恰地区周围主压应力方向为NNE向。此外研究区普遍的较大R值表明区域含有一定张性成分,并产生张力作用,但相对NS向挤压来说较小,结果较好地反映了天山地震带构造应力场的空间分布特征。Based on the focal mechanism solution data of 520 earthquakes in Tianshan seismic belt,the spatial distribution of tectonic stress field in this area is inversed by using the damped least squares in MSATSI software package.The results show that the Tianshan seismic belt is mainly affected by the compressive stress in the direction of nearly NS,and the direction of its maximum principal compressive stress axis changes from east to west in the direction of NNE―N―NNW.The main stress direction of the North Tianshan seismic belt is in the direction of NS,and that around Urumqi and the East is in the direction of NNE.The maximum principal stress direction of the west segment of the South Tianshan seismic belt is in the direction of NNW,and that of the east segment is in the direction of NNE,while the direction of principal compressive stress around Wuqia area is NNE.In addition,the generally large R value in the study area indicates that there is a certain tension component in the area,but it is smaller than NS compression,which reflects the spatial distribution characteristics of tectonic stress field in Tianshan seismic belt.

关 键 词：天山地震带 震源机制解 构造应力场 应力场反演 

分 类 号：P315.7[天文地球—地震学]