| 地磁极化方法在阿拉善5.0级地震中的应用研究 |
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| 引用本文： | 廖晓峰,冯丽丽,祁玉萍,李霞.地磁极化方法在阿拉善5.0级地震中的应用研究[J].地震,2019,39(4):127-135. |
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| 作者姓名： | 廖晓峰 冯丽丽 祁玉萍 李霞 |
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| 作者单位： | 四川省地震局,四川成都,610041;青海省地震局,青海西宁,810001 |
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| 基金项目： | 2019年度震情跟踪定向工作任务(2019010415)、 2019年度震情跟踪定向工作任务(2019010402)联合资助 |
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| 摘 要： | 以西北地区甘青两省地磁资料为研究对象, 应用地磁极化方法对其进行处理和分析, 发现在2017年6月3日阿拉善5.0级地震前, 震中附近地磁台站同步出现了极化超阈值现象, 异常特征如下: ① 阿拉善5.0级地震前出现了3次极化值高值异常, 时间上反映地震的短期特征; ② 3次发生异常的台站数量逐次增加; ③ 3次异常的幅值逐渐增大; ④ 3次异常持续时间依次增大。 ⑤ 3次极化异常空间分布范围随地震的临近而逐渐增大。
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| 关 键 词： | 地磁 极化方法 超阈值异常 阿拉善地震 |
| 收稿时间： | 2019-04-03 |
Application of Geomagnetic Polarization Methodin the Alashan M5.0 Earthquake |
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| LIAO Xiao-feng,FENG Li-li,QI Yu-ping,LI Xia.Application of Geomagnetic Polarization Methodin the Alashan M5.0 Earthquake[J].Earthquake,2019,39(4):127-135. |
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| Authors: | LIAO Xiao-feng FENG Li-li QI Yu-ping LI Xia |
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| Institution: | 1.The Seismological Bureau of Sichuan Province, Chengdu 610041, China;
2.Seismological Bureau of Qinghai Province, Xining 810001, China |
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| Abstract: | Taking the geomagnetic data of Gansu and Qinghai provinces in Northwest China as the research object, Using the method of geomagnetic polarization, it is found that before the Alashan earthquake of M5.0 on June 3, 2017, The phenomena of polarization over-threshold appeared at geomagnetic stations near the epicenter. The anomalies are as follows: ① Three high polarization anomalies occurred before the Alashan M5.0 earthquake, presenting the short-term characteristics of the earthquake in time. ② The number of abnormal stations increased gradually with the three anomalies. ③ The amplitude increased gradually. ④ The duration of three anomalies grew longer in turn. ⑤ The spatial distribution of three polarization anomalies enlarged with the approaching of Alashan earthquake. |
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| Keywords: | Geomagnetic Polarization method Superthreshold anomaly Alashan earthquake |
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