摘要:
在唐山地震前两个月至主震后约半年的时段内,西集、宝坻、塘沽等三个地电观测台自然电场断续出现特定周期的变化:其周期为半月、一月及半年;其双振幅每公里达数十乃至一、二百毫伏(超过平时观测标准误差6—20倍);电场呈线性极化,其方向大致平行台址附近断裂带的走向。若把这种变化同复杂的干扰区分开并与理论重力值对比,似与日、月起潮力有所联系。其中半月周期变化的极值点,还与震中周围两口废油井间歇自喷现象同时出现,表明电场的这种变化可能与断裂带內地下液体运动状态的变化有关,故认为是一种过滤速度受起潮力调制的过滤电场.微小的起潮力只在主震前后一段时间内才引起这种过滤电势的变化。
Abstract:
During the time interval from two months before the Tangshan Earthquake till about half a year after it, at the three stations, Xiji, Baodi, Tanggu, variations of the telluric electric field were observed with definite periods of half a month, one month and half a year respectively. Their amplitudes of from maximum to minimum reach several tens to 100—200 millivolts/km (exceed the average standard error of measurement by 6—20 times). the electric field appears to be linearly polarized, in directions parallel to that- of the nearby fault zones.If such variations should be separated from other disturbing factors and be com-pared with the theoretical gravity values on earth surface, it seems apparent that there exists certain connection with the tidal force of the earth. The extreme values of the electric field of the half-month variation have been found to coincide with the intermittent spouting of two nearby abandoned oil wells. It may indicate that the variation of the telluric electric field, has something to do with the change of movement of underground liquids and that one may suppose there exists a filtration electric field caused by the modulation of the velocity of filtration by tidal forces. Small tidal force can give rise to such change of filtration electric field only during the time period before and after the earthquakes.
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