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采用纯振幅、点阻、带通数字滤波器,处理了距唐山180公里范围内13口深井水位的大震前六年连续观测资料。结果表明,大震前存在井水水位的异常下降,这种异常下降首先发生在距大震震中100公里处,并且以每月5—6公里的速度分别向震中和离开震中的方向传播。地下水异常下降的时间—距离关系与该区里小震发生的时间—距离关系较一致。据地下水异常下降结果,我们提出唐山大震孕育过程可以分为三个阶段:1972年—1974年底,1975年—1976年4月,1976年4月—大震发生。
Using pure amplitude, point resistance and band-pass digital filter, the continuous observation data of the first six years before the great earthquake of 13 deep water levels within 180 km from Tangshan were processed. The results show that there was an abnormal drop of well water level before the earthquake. This anomaly drop firstly occurred 100 km from the epicenter and propagated to the epicenter at a speed of 5-6 km per month. The time-distance relation of groundwater anomalous descent is more consistent with the time-distance of minor earthquakes in this area. According to the result of abnormal groundwater descent, we propose that the breeding process of Tangshan earthquake can be divided into three stages: from 1972 to the end of 1974, from April 1975 to April 1976 and from April 1976 to April 1976.