| 鄂尔多斯块体东北缘地区震源机制和应力场特征研究 |
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| 引用本文： | 包金哲,王树波,郝美仙,韩晓明,张晖,尹战军,杨彦明.鄂尔多斯块体东北缘地区震源机制和应力场特征研究[J].地震地磁观测与研究,2021,42(1):13-19. |
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| 作者姓名： | 包金哲 王树波 郝美仙 韩晓明 张晖 尹战军 杨彦明 |
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| 作者单位： | 中国呼和浩特010010 内蒙古自治区地震局 |
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| 基金项目： | 中国地震局监测、预报、科研三结合课题（项目编号：3JH-201901053） |
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| 摘 要： | 选取鄂尔多斯块体东北缘地区(38.5°—42.0°N,109.5°—116.0°E)2008年1月—2018年4月144个ML≥2.5地震事件,利用振幅比和P波初动联合求解震源机制解的方法(FOCMEC方法),得到鄂尔多斯块体东北缘地区(晋冀蒙交界区域)地震震源机制解。利用阻尼区域应力反演方法(MSATSI软件)将研究区域分为1°×1°的地壳应力场,得到了应力场图像。结果显示,鄂尔多斯块体东北缘地区(晋冀蒙交界区域)震源机制解主要类型是正断型和走滑型,应力状态以拉张为主,局部区域存在剪切作用,最大水平主应力方位主要为NE向。
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| 关 键 词： | 震源机制 晋冀蒙交界区域 应力场 FOCMEC MSATSI |
Research on focal mechanisms and stress field in the northeast edge of Ordos block |
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| BAO Jinzhe,WANG Shubo,HAO Meixian,HAN Xiaoming,ZHANG Hui,YIN Zhanjun,YANG Yanming.Research on focal mechanisms and stress field in the northeast edge of Ordos block[J].Seismological and Geomagnetic Observation and Research,2021,42(1):13-19. |
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| Authors: | BAO Jinzhe WANG Shubo HAO Meixian HAN Xiaoming ZHANG Hui YIN Zhanjun YANG Yanming |
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| Institution: | Earthquake Agency of Inner Mongolia Autonomous Regin, Hohhot 010010, China |
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| Abstract: | This paper selects 144 ML ≥ 2.5 earthquakes that occurred from January 2008 to April 2018 in the area of the northeast edge of ordos block (latitude 38.5°- 42.0°; longitude 109.5°-116.0°) and uses the method combining the amplitude ratio and P-wave initial motion analysis (FOCMEC) to obtain the focal mechanism solution for the area of northeast edge of Ordos block (the border area of Shanxi, Hebei, and Inner Mongolia). The stress field is obtained by using a damped stress inversion method (MSATSI) with a spatial resolution of 1°×1°. The results show that the main source types of earthquakes in the area of the northeast edge of Ordos block (the border area of Shanxi, Hebei, and Inner Mongolia) are normal faults and strike-slip type. The stress is mainly tension. There are shearing stress and tensile stress in some areas. The orientation of the maximum horizontal principal stress is mainly distributed in the NE direction. |
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| Keywords: | focal mechanism the border area of Shanxi Hebei and Inner Mongolia stress field FOCMEC MSATSI |
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