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水化学异常点的平面分布呈网络状,与地震活动图象类似。唐山地震的水化异常发生在北东或北西向的前兆迹线上,并呈现阶段性,水化异常指示了某些断裂在地震前后有过活动。
The distribution of water chemical anomalies is in a network, similar to seismic images. The hydration anomaly of the Tangshan earthquake occurred on the NE or NW-trending precursory trace and showed periodicity. Hydration anomalies indicated that some faults had been active before and after the earthquake.