| 海原及周边地区中小地震震源机制解研究 |
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| 引用本文： | 陈继锋,蒲举,罗仁昱,李青梅,陈晓龙.海原及周边地区中小地震震源机制解研究[J].西北地震学报,2020,42(5):1049-1054,1064. |
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| 作者姓名： | 陈继锋 蒲举 罗仁昱 李青梅 陈晓龙 |
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| 作者单位： | 中国地震局兰州岩土地震研究所, 甘肃 兰州 730000;甘肃省地震局, 甘肃 兰州 730000;宁夏自治区地震局, 宁夏 银川 750000 |
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| 基金项目： | 中国地震局地震科技星火计划项目（XH19043）；甘肃省地震局地震科技英才计划（2019YC-01-09） |
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| 摘 要： | 1920年12月16日在宁夏海原地区发生了8.5级大地震。100年来，海原及周边地区地震活动水平仍然较高。利用甘肃、宁夏区域测震台网记录的三分向宽频带数字波形资料，基于CAP方法（Cut and Paste Method）反演了宁夏海原及周边地区2010年1月至2019年12月间M>3.0的16次中小地震的震源机制解。结果显示，海原地区震源机制解以走滑型及走滑兼逆冲型为主，主压应力P轴主要集中在NE向，与区域主压应力方向有较好的对应。通过与哈佛大学中强地震震源机制结果、P波初动地震震源机制结果对比发现，该地区的中小地震震源机制的反演结果与强震震源机制结果有较好的一致性，结果比较可信，表明中小地震震源机制的结果也可以较好地用于区域构造应力场的研究。未来随着烈度速报与预警工程项目的建成，地震台站密度的大幅增加，地震定位精度与台站分布将会得到明显改善，对中小地震震源机制解反演及结果的深入研究具有更加重要的科学意义。
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| 关 键 词： | 海原地震 震源机制解 CAP方法 |
| 收稿时间： | 2020/7/10 0:00:00 |
Focal Mechanism Solutions of Moderate and Small Earthquakes in Haiyuan and Surrounding Areas |
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| CHEN Jifeng,PU Ju,LUO Renyu,LI Qingmei,CHEN Xiaolong.Focal Mechanism Solutions of Moderate and Small Earthquakes in Haiyuan and Surrounding Areas[J].Northwestern Seismological Journal,2020,42(5):1049-1054,1064. |
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| Authors: | CHEN Jifeng PU Ju LUO Renyu LI Qingmei CHEN Xiaolong |
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| Institution: | Lanzhou Institute of Geotechnical Earthquake, China Earthquake Administration, Lanzhou 730000, Gansu, China;Gansu Earthquake Agency, Lanzhou 730000, Gansu, China;Ningxia Earthquake Agency, Yinchuan 750000, Ningxia, China |
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| Abstract: | On December 16, 1920, a magnitude 8.5 earthquake occurred in Haiyuan County, Gansu, China. The earthquake and its aftershocks caused 288 200 casualties and damaged dozens of counties severely. This paper analyzed broadband waveforms to invert seismic moment tensors with sufficient signal-to-noise levels using the Gansu and Ningxia seismic networks. We obtained 16 focal mechanism solutions of Haiyuan and its surrounding areas from January 2010 to December 2019 using the cut-and-paste method. Results showed that the focal mechanism solutions in the Haiyuan area were mainly strike-slip and strike-slip with thrust type, and the P-axis of the main compressive stress was mainly concentrated in the NE direction. These findings are in good agreement with the direction of the regional main compressive stress. |
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| Keywords: | Haiyuan earthquake focal mechanism solution CAP method |
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