| 宁夏地区重力场变化与2012年永宁MS4.6地震 |
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| 引用本文： | 谢汝一,秦建增,李洋洋,郝鹏飞,孙军伟.宁夏地区重力场变化与2012年永宁MS4.6地震[J].西北地震学报,2017,39(S1):83-87. |
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| 作者姓名： | 谢汝一 秦建增 李洋洋 郝鹏飞 孙军伟 |
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| 作者单位： | 中国地震局地球物理勘探中心, 河南 郑州 450002,中国地震局地球物理勘探中心, 河南 郑州 450002,中国地震局地球物理勘探中心, 河南 郑州 450002,中国地震局地球物理勘探中心, 河南 郑州 450002,中国地震局地球物理勘探中心, 河南 郑州 450002 |
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| 基金项目： | 行业专项（201508009；201208008） |
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| 摘 要： | 利用宁夏地区2011—2013年期间多期重力观测资料，采用中国地震局推广的LG-ADJ程序对观测资料进行平差处理，给出地震前后3年的区域重力场变化和点值变化图像。结合构造活动分析，对2012永宁4.6级地震前后宁夏地区重力异常变化进行研究。认为：2012年永宁地震前，测区重力场出现较好的中期前兆性变化图像，临震前短期异常突增，重力场在空间和量值上均出现大幅的上升变化，重力点值震前趋势下降-转折上升-加速上升-发震的变化，是非常值得关注的前兆异常。
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| 关 键 词： | 重力场变化 永宁4.6级地震 宁夏地区 重力资料 前兆异常 |
| 收稿时间： | 2016/9/21 0:00:00 |
Gravity Field Variation in Ningxia Region and Its Relation to the 2012 Yongning MS4.6 Earthquake |
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| XIE Ruyi,QIN Jianzeng,LI Yangyang,HAO Pengfei and SUN Junwei.Gravity Field Variation in Ningxia Region and Its Relation to the 2012 Yongning MS4.6 Earthquake[J].Northwestern Seismological Journal,2017,39(S1):83-87. |
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| Authors: | XIE Ruyi QIN Jianzeng LI Yangyang HAO Pengfei and SUN Junwei |
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| Institution: | Geophysical Exploration Center of China Earthquake Administration, Zhengzhou 450002, Henan, China,Geophysical Exploration Center of China Earthquake Administration, Zhengzhou 450002, Henan, China,Geophysical Exploration Center of China Earthquake Administration, Zhengzhou 450002, Henan, China,Geophysical Exploration Center of China Earthquake Administration, Zhengzhou 450002, Henan, China and Geophysical Exploration Center of China Earthquake Administration, Zhengzhou 450002, Henan, China |
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| Abstract: | In this paper, in combination with the analysis of tectonic activities in the Ningxia region, we use 2011-2013 gravity observation data to investigate the gravity anomaly variation before and after the 2012 Yongning MS4.6 earthquake. We used LG-ADJ software to process the data, which has been generalized by the China Earthquake Administration. The research results show that the gravity field in the measurement area underwent good medium-term precursory variation before the 2012 Yongning MS4.6 earthquake, after which the impending anomalies suddenly increased. The gravity field showed a sharp rise in both area and quantity. The variation tendency of the gravity point value before the earthquake showed a descent-ascent-accelerative ascent-earthquake occurrence style, which is an anomaly of widely recognized concern. |
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| Keywords: | gravity field change Yongning M4 6 earthquake Ningxia region gravity data precursor anomaly |
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