基于MSATSI的辽宁地区构造应力场特征  

Characteristics of Tectonic Stress Field in Liaoning Based on MSATSI

作　　者：戴盈磊[1] 张文静 王承伟[1] 惠杨 DAI Ying-lei;ZHANG Wen-jing;WANG Cheng-wei;HUI Yang(Liaoning Earthquake Agency,Liaoning Shenyang 110034,China)

机构地区：[1]辽宁省地震局,辽宁沈阳110034

出　　处：《防灾减灾学报》2021年第3期1-8,共8页Journal of Disaster Prevention And Reduction

基　　金：中国地震局城市活断层探测与地震危险性评价项目(152007000000170013);沈抚新区浑河断裂带活断层探测与地震危险性评价项目(LNZC2018-0173)。

摘　　要：震源机制解与构造应力场有着密切的联系。通过收集整理并使用格点尝试法求取到1971至2020年辽宁及邻区2.5~7.3级地震的震源机制解共计319个。据此使用MSATSI软件包反演计算辽宁地区1°×1°精细度的构造应力场。结果显示,辽宁地区最大主压应力轴最优解的优势方位为NEE向,不确定范围相对较稳定。最小主压应力轴最优解以NNW向为主,在辽西地区为近NS向。大多数网格的应力场结果属于走滑类型,且应力形因子R值大于0.5,这反映出辽宁地区整体上处在拉张的应力状态,以及主要控制断裂的走滑运动性质。该应力场反演结果与之前学者使用其他不同方法的研究结果较为一致,可以为后续有关构造活动等研究工作提供有效的参考。The focal mechanism solution is related to the tectonic stress field.This paper collects,sorts out and uses the grid point trial method to obtain a total of 319 focal mechanism solutions for the M2.5-7.4 earthquakes in Liaoning and its neighboring areas from 1971 to 2020.Based on this,the MSATSI software package was used to inversely calculate the 1°×1°tectonic stress field in the Liaoning area.The results show that the dominant direction of the optimal solution for the maximum principal compressive stress axis in Liaoning area is the NEE direction,and the uncertainty range is relatively stable.The optimal solution of the minimum principal compressive stress axis is mainly in the NNW direction,and it is near the NS direction in the western part of Liaoning.The Liaoning area is in a state of tension as a whole.The stress field results of most grids belong to the strike-slip type,and the stress shape ratio R is greater than 0.5,which reflects that the Liaoning area is in the tensile stress state as a whole,and the strike-slip movement of the main faults is controlled.The inversion results of stress field in this paper are consistent with the results of other different methods used by previous scholars,which can provide effective reference for subsequent research on tectonic activities.

关 键 词：构造应力场 震源机制解 MSATSI 应力形因子 辽宁地区 

分 类 号：P315.7[天文地球—地震学]