| 2012年江苏扬州M 4.9地震前地磁垂直分量日变双低点异常 |
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| 引用本文： | 郭明瑞,胡久常,吴佳林,王桂丹,王锡娇,崔泽岩.2012年江苏扬州M 4.9地震前地磁垂直分量日变双低点异常[J].地震地磁观测与研究,2018,39(3):89-93. |
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| 作者姓名： | 郭明瑞 胡久常 吴佳林 王桂丹 王锡娇 崔泽岩 |
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| 作者单位： | 1.中国海口 570203 海南省地震局;2.中国河北 074211 易县地震台 |
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| 摘 要： | 2012年6月13日和7月10日华东地区部分地磁台垂直分量日变形态出现双低点异常，首次异常出现后37天，于7月20日发生江苏扬州M 4.9地震，震中位于低点位移分界线附近。分析认为，在强震前由于应力变化，引起孕震体环境中介质电导率等电磁性质发生改变，区域地磁场垂直分量日变曲线出现相位和幅度变化，说明地磁垂直分量日变双低点异常与地震的孕育和发生相关。
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| 关 键 词： | 地磁垂直分量 日变 双低点异常 预测 地震 |
About diurnal variation double low anomaly of geomagnetic vertical component before Yangzhou M 4.9 earthquake in Jiangsu Province in 2012 |
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| Guo Mingrui,Hu Jiuchang,Wu Jialin,Wang Guidan,Wa.About diurnal variation double low anomaly of geomagnetic vertical component before Yangzhou M 4.9 earthquake in Jiangsu Province in 2012[J].Seismological and Geomagnetic Observation and Research,2018,39(3):89-93. |
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| Authors: | Guo Mingrui Hu Jiuchang Wu Jialin Wang Guidan Wa |
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| Institution: | 1.Hainan Earthquake Agency, Haikou 570203, China;2.Yixian Seismic Station, Hebei Province 074211, China |
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| Abstract: | On July 20, 2012, the M 4.9 earthquake occurred in Yangzhou, Jiangsu Province, and double point anomalies of diurnal variation of geomagnetic vertical component are found in part of geomagnetic platforms in eastern China 37 days before the earthquake. The epicenter was near the low displacement boundary. The analysis shows that the seismogenic environment causes the changes of medium conductivity and electromagnetic properties. The phase and amplitude change of diurnal variation curve of vertical component of regional geomagnetic field indicates that the double low anomaly of geomagnetic vertical component is related to the gestation and occurrence of earthquake. |
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| Keywords: | geomagnetic vertical component daily variation double low anomaly prediction earthquake |
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