| Tidal wave anomalies of geoelectrical field before remote earthquakes |
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| 作者姓名： | 张学民 翟彦忠 郭学增 郭建芳 |
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| 作者单位： | Institute of Geology China Earthquake Administration Beijing 100029 China，Earthquake Administration of Hebei Province Shijiazhuang 050021 China，Earthquake Administration of Hebei Province Shijiazhuang 050021 China，Earthquake Administration of Hebei Province Shijiazhuang 050021 China |
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| 基金项目： | National Key Project of Science and Technology (2004BA601B010503) |
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| 摘 要： | Introduction Geoelectrical field is a kind of intrinsic geophysical field of the earth, affected by kinds of current systems in outer space and electric properties of media underground, so it carries abundant interior information of the earth. Since 1981 when the group of “VAN” in Greece carried out the study of electric field observation by multi-polar distances (Varotsos and Alexopoulous, 1984a, b), more and more scientists in the world paid extensive attention to it due to its better re…
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| 关 键 词： | 河北 地电场异常 潮汐波异常 应力波 地震预测 |
| 文章编号： | 1000-9116（2007）01-0051-12 |
| 收稿时间： | 2006-04-14 |
| 修稿时间： | 2006-10-13 |
Tidal wave anomalies of geoelectrical field before remote earthquakes |
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| Zhang Xue-min , Zhai Yan-zhong , Guo Xue-zeng and Guo Jian-fang.Tidal wave anomalies of geoelectrical field before remote earthquakes[J].Acta Seismologica Sinica(English Edition),2007,20(1):51-62. |
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| Authors: | Zhang Xue-min Zhai Yan-zhong Guo Xue-zeng and Guo Jian-fang |
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| Institution: | (1) Institute of Geology, China Earthquake Administration, Beijing, 100029, China;(2) Earthquake Administration of Hebei Province, Shijiazhuang, 050021, China |
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| Abstract: | In this paper, geoelectrical field anomalies at Changli and Xingji station in Hebei Province were analyzed before five remote earthquakes. It was found that the anomalies mainly occurred two or three months before earthquakes, which is of importance to short-term and impendent earthquake prediction. There exhibited different characteristics in geoelectrical field anomalies, but they were closely related to tidal waves, for example, the increasing in ampli- tude at semidiurnal and semimonthly periods of tidal waves; the decreasing or disappearing in amplitude of tidal waves that should have been recorded normally at that time; while there accompanied incremental signals with high frequency, such as jump variations. It was thought that the formation mechanism of the geoelectrical anoma- lies before strong earthquakes resulted from stress-strain resonance effects when rock was weakened during the preparation process in seismic area, and then signals of electric field propagated to remote stations in free space or crust, and superposed on the geoelectric field tidal waves recorded at the stations, leading to increasing or decreas- ing in amplitude of geoelectrical tidal waves. The high frequency signals may be related to the variation of rock porosity, permeability and so on beneath the stations, as a result of the dynamic effects of remote earthquakes. |
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| Keywords: | geoelectrical field geoelectrical tidal waves semidiurnal period strain wave imminent seismic prediction |
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