| 2013年岷县-漳县6.6级地震震前地磁异常分析 |
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| 引用本文： | 涂先新,王弘宇,王杰,翁骋,康波.2013年岷县-漳县6.6级地震震前地磁异常分析[J].西北地震学报,2019,41(6):1568-1573. |
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| 作者姓名： | 涂先新 王弘宇 王杰 翁骋 康波 |
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| 作者单位： | 中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071,中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071,中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071,中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071,中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071 |
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| 摘 要： | 区域地磁在一定范围内，在排除空间环境、仪器本身故障等因素的前提下，各地磁台所观测到的地磁曲线是具一定相关性的，但强震孕震过程中会引起电导率等电磁性质发生改变，从而改变台站间地磁本应呈现出来的相关性，因此地磁异常可以为震前地震预报提供有用信息。以2013年7月22日岷县-漳县6.6级地震为研究对象，对其震前地磁前兆异常进行研究。分析表明：震前有明显的低点位移异常现象，且在此次异常后36天发生了6.6级地震；地磁Z值的每日一值空间相关分析也出现了明显异常，从空间上看，相关系数与地震震中有很好的对应关系，震中刚好处在相关系数最低的位置；且地磁台的密集程度对计算区域相关系数具有较大影响。
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| 关 键 词： | 地震活动性 地磁 低点位移 每日一值 |
| 收稿时间： | 2017/8/20 0:00:00 |
Geomagnetic Anomalies Prior to the Minxian-Zhangxian M6.6 Earthquake of 2013 |
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| TU Xianxin,WANG Hongyu,WANG Jie,WENG Cheng and KANG Bo.Geomagnetic Anomalies Prior to the Minxian-Zhangxian M6.6 Earthquake of 2013[J].Northwestern Seismological Journal,2019,41(6):1568-1573. |
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| Authors: | TU Xianxin WANG Hongyu WANG Jie WENG Cheng and KANG Bo |
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| Institution: | Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Earthquake Agency of Hubei Province, Wuhan 430071, Hubei, China,Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Earthquake Agency of Hubei Province, Wuhan 430071, Hubei, China,Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Earthquake Agency of Hubei Province, Wuhan 430071, Hubei, China,Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Earthquake Agency of Hubei Province, Wuhan 430071, Hubei, China and Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Earthquake Agency of Hubei Province, Wuhan 430071, Hubei, China |
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| Abstract: | A certain correlation exists between geomagnetic curves observed by different geomagnetic stations when the space environment, instrument failure, and other factors are excluded. Electromagnetic properties change, however, during the seismogenic process of strong earthquakes. Thus, the correlation between the geomagnetism of different geomagnetic stations will also change. Therefore, the identification of geomagnetic anomalies before the occurrences of earthquakes can provide useful information for earthquake prediction. In this work, we analyzed the geomagnetic precursor anomalies that occurred prior to the Minxian-Zhangxian M6.6 earthquake in 2013. Analytical results revealed the abnormal phenomenon of low-point displacement at 36 days before the M6.6 earthquake. In addition, an anomaly was identified through the spatial correlation analysis of daily geomagnetic Z values. A good correspondence between the correlation coefficient and earthquake epicenter was observed. The intensity of geomagnetic stations has a considerable influence on the correlation coefficient of the calculated area. |
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| Keywords: | seismic activity geomagnetism low point displacement daily value |
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