| 山西断陷带地震矩释放现象特征研究 |
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| 引用本文： | 李宏伟,王霞,宋美琴,陈慧.山西断陷带地震矩释放现象特征研究[J].地震地磁观测与研究,2021,42(1):7-12. |
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| 作者姓名： | 李宏伟 王霞 宋美琴 陈慧 |
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| 作者单位： | 中国太原030021 山西省地震局 |
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| 基金项目： | 中国地震局地震科技星火计划项目（项目编号：XH200403Y）；山西省应用基础研究计划青年科技研究基金（项目编号：201901D211548）；山西省地震局2018年科研项目（项目编号：SBK-1801）；2018年度震情跟踪青年课题（项目编号：2018010102） |
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| 摘 要： | 对山西及邻区22次ML≥5.0地震前不同时间尺度的累积benioff应变释放特征进行分析,认为约55%的地震震前存在地震矩加速释放现象;同时对地震矩释放异常空间区与主震间的关系进行分析,结果表明,在震前1年内大部分地震震中附近出现大范围椭圆形的地震矩低值区域,且主震震中位于异常区内部或边缘。由此认为,地震矩加速释放现象在山西及邻区具有一定的普遍性,且为中期地震前兆异常。
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| 关 键 词： | 地震矩释放现象 benioff应变释放 山西断陷带 |
Study on seismic moment release in Shanxi depression zone |
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| LI Hongwei,WANG Xia,SONG Meiqin,CHEN Hui.Study on seismic moment release in Shanxi depression zone[J].Seismological and Geomagnetic Observation and Research,2021,42(1):7-12. |
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| Authors: | LI Hongwei WANG Xia SONG Meiqin CHEN Hui |
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| Institution: | Shanxi Earthquake Agency, Taiyuan 030021, China |
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| Abstract: | The characteristics of the Benioff strain release curve in different time scales before 22 ML ≥ 5.0 earthquakes in Shanxi and adjacent areas are analyzed. It is concluded that accelerating moment release exists before half of ML ≥ 5.0 earthquakes. At the same time, this paper analyzed the relationship between the moment release anomaly space and earthquakes and concluded that there is a wide range of low m-value area near the epicenter of the mainshock one year before the earthquake, and the mainshocks are located in or near the anomalous areas. Therefore, we consider that accelerating moment release has a certain generality before ML ≥ 5.0 earthquakes in Shanxi and adjacent areas, and it is the medium earthquake precursor. |
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| Keywords: | seismic moment release Benioff strain release Shanxi depression zone |
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