| 使用震源机制解反演内蒙古东部地区构造应力场 |
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| 引用本文： | 张 帆,王晓山,娜仁花,韩晓明,李 娟,张 珂.使用震源机制解反演内蒙古东部地区构造应力场[J].大地测量与地球动力学,2020,40(8):771-777. |
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| 作者姓名： | 张 帆 王晓山 娜仁花 韩晓明 李 娟 张 珂 |
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| 摘 要： | 使用内蒙古地震台网2008-01~2017-12记录的数字地震波形观测资料，采用基于P波初动和振幅比联合求解（FOCMEC）方法计算震源机制，获得内蒙古东部地区发生的138个ML≥2.5地震的震源机制解。对震源机制解特征进行分析显示，研究区地震震源类型以走滑型为主，兼有一定比例的逆冲型，而正断型相对较少，P轴和T轴走向的优势方向分别为NEE-SWW向和NNW-SSE向。将研究区划分为1°×1°的网格，采用阻尼区域应力反演（MSATSI）方法获得研究区的应力张量和应力场图像。应力场反演结果显示，内蒙古东部地区应力状态主要表现为走滑，局部区域存在剪切、挤压，最大主应力方向主要分布在NEE-SWW向，由北向南顺时针旋转。
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| 关 键 词： | 震源机制 内蒙古东部 应力场 FOCMEC MSATSI |
Inversion of Tectonic Stress Field in Eastern Inner Mongolia by Focal Mechanism |
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| ZHANG Fan,WANG Xiaoshan,NA Renhua,HAN Xiaoming,LI Juan,ZHANG Ke.Inversion of Tectonic Stress Field in Eastern Inner Mongolia by Focal Mechanism[J].Journal of Geodesy and Geodynamics,2020,40(8):771-777. |
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| Authors: | ZHANG Fan WANG Xiaoshan NA Renhua HAN Xiaoming LI Juan ZHANG Ke |
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| Abstract: | Using digital seismic waveform recorded by the Inner Mongolia seismic network from January 2008 to December 2017, the focal mechanisms of 138 ML≥2.5 earthquakes in eastern Inner Mongolia are calculated by P-wave initial motion and amplitude ratio (FOCMEC) method. The analysis of focal mechanism solution shows that the main source types in the study area are strike-slip with a certain proportion of thrust, while normal faults types are relatively few. The advantageous directions of P-axis and T-axis are NEE-SWW and NNW-SSE directions, respectively. The study area is divided into 1°×1°. The stress tensor and stress field images of the study area are obtained by damped stress inversion (MSATSI) method. The inversion results of stress field show that the stress state in eastern Inner Mongolia is mainly strike-slip, but shear and compression exist in some areas. The maximum principal stress square mainly distributes in NEE-SWW direction and rotates clockwise from north to south. |
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| Keywords: | focal mechanism eastern Inner Mongolia stress field FOCMEC MSATSI |
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