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Tidal wave anomalies of geoelectrical field before remote earthquakes

机译：地震前地电场的潮汐异常

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摘要

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 amplitude 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 anomalies 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 decreaseing 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.
机译：本文分析了五次偏远地震前河北省昌黎站和星际站的地电场异常。发现异常主要发生在地震发生前两三个月，这对于短期和即将发生的地震预报具有重要意义。地电场异常表现出不同的特征，但它们与潮汐密切相关，例如，在潮汐的半日和半月期振幅增加；当时应正常记录的潮汐波幅的减小或消失；而伴随着高频的增量信号，例如跳跃变化。认为强震前地电异常的形成机理是由于地震过程中岩石在准备过程中变弱时应力-应变共振效应所致，然后电场信号传播到自由空间或地壳中的远程站，并且叠加在站点记录的地电场潮汐波上，导致地电场潮汐波幅增大或减小。由于远程地震的动态影响，高频信号可能与台站下方的岩石孔隙度，渗透率等变化有关。

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