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琼州7.5级地震区深部电性异常及地震活动性研究
引用本文:胡久常,白登海,王薇华,林镇,向小娟,王立风.琼州7.5级地震区深部电性异常及地震活动性研究[J].地震学报,2007,29(3):258-264.
作者姓名:胡久常  白登海  王薇华  林镇  向小娟  王立风
作者单位:1) 中国海口570203海南省地震局2) 中国北京100029中国科学院地质与地球物理研究所3) 中国北京100083中国地质大学(北京)4) 中国北京100029中国地震局地质研究所
摘    要:通过对1605年琼州7.5级大地震震中区及邻近地区大地电磁探测,发现震中区地壳深部存在一低阻体.该低阻体自约13 km以下一直延伸到上地幔,推测其为正在上升的地幔柱,并由此认为地幔柱的存在及其热物质的上涌,使上部地壳产生断裂和粘滑活动,是产生琼州7.5级大地震的重要原因. 这次大地震后断裂活动表现为以蠕滑为主.推测未来再发生同等强度大地震的危险性将大大降低. 

关 键 词:大地电磁    地震    低阻体    地幔柱    琼州
文章编号:0253-3782(2007)03-0258-07
修稿时间:2006年10月30

DEEP ELECTRICAL ANOMALY IN THE M7.5 QIONGZHOU EARTHQUAKE REGION AND ITS RELATION WITH FUTURE SEISMICITY
Hu Jiuchang,Bai Denghai,Wang Weihua,Lin Zhen,Xiang Xiaojuan,Wang Lifeng.DEEP ELECTRICAL ANOMALY IN THE M7.5 QIONGZHOU EARTHQUAKE REGION AND ITS RELATION WITH FUTURE SEISMICITY[J].Acta Seismologica Sinica,2007,29(3):258-264.
Authors:Hu Jiuchang  Bai Denghai  Wang Weihua  Lin Zhen  Xiang Xiaojuan  Wang Lifeng
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 uprising 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.
Keywords:magnetotellurics  earthquake  low resistive body  mantle pole  Qiongzhou
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