| Deep electrical anomaly in the M7.5 Qiongzhou earthquake region and its relation with future seismicity |
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| 作者姓名： | 胡久常 白登海 王薇华 林镇 向小娟 王立风 |
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| 作者单位： | Earthquake Administration of Hainan Province，Institute of Geology and Geophysics Chinese Academy of Sciences，China University of Geosciences，Earthquake Administration of Hainan Province，Earthquake Administration of Hainan Province，Institute of Geology China Earthquake Administration，Haikou 570203 China，Beijing 100029 China，Beijing 100083 China，Haikou 570203 China，Haikou 570203 China，Beijing 100029 China |
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| 基金项目： | Joint Seismological Science Foundation of China (104123). |
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| 摘 要： | From the magnetotelluric detection in the epicentral region and the adjacent areas of the 1605 M7.5 Qiongzhou earthquake, we have discovered there is a low resistive body in the deep crust of the epicentral region. The low resistive body extends straightly from the depth of about 13 km to the upper mantle, which is supposed as an up-rising mantle pole. We therefore consider it is just the existing mantle pole and its upwelling thermal material that result in the faulting and stick-slipping activities of the upper crust, which is an important factor for the M7.5 Qiongzhou great earthquake occurrence. The postseismic faulting activity is characterized by creep, which shows that the risk is greatly decreased for the occurrence of a great earthquake with similar intensity in the future.
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| 关 键 词： | M7.5琼洲地震区 深部地电异常 未来地震活动 相互关系 |
| 文章编号： | 1000-9116（2007）03-0273-07 |
| 收稿时间： | 2006-10-30 |
| 修稿时间： | 2007-01-25 |
Deep electrical anomaly in the M 7.5 Qiongzhou earthquake region and its relation with future seismicity |
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| Hu Jiu-chang , Bai Deng-hai , Wang Wei-hua , Lin Zhen , Xiang Xiao-juan and Wang Li-feng.Deep electrical anomaly in the M7.5 Qiongzhou earthquake region and its relation with future seismicity[J].Acta Seismologica Sinica(English Edition),2007,20(3):273-279. |
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| Authors: | Hu Jiu-chang Bai Deng-hai Wang Wei-hua Lin Zhen Xiang Xiao-juan and Wang Li-feng |
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| Institution: | (1) Earthquake Administration of Hainan Province, Haikou, 570203, China;(2) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;(3) China University of Geosciences, Beijing, 100083, China;(4) Institute of Geology, China Earthquake Administration, Beijing, 100029, China |
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| Abstract: | From the magnetotelluric detection in the epicentral region and the adjacent areas of the 1605 M7.5 Qiongzhou earthquake, we have discovered there is a low resistive body in the deep crust of the epicentral region. The low resistive body extends straightly from the depth of about 13 km to the upper mantle, which is supposed as an up- rising mantle pole. We therefore consider it is just the existing mantle pole and its upwelling thermal material that result in the faulting and stick-slipping activities of the upper crust, which is an important factor for the M7.5 Qiongzhou great earthquake occurrence. The postseismic faulting activity is characterized by creep, which shows that the risk is greatly decreased for the occurrence of a great earthquake with similar intensity in the future. |
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| Keywords: | magnetotellurics earthquake low resistive body Qiongzhou |
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