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土层应变仪观测网的观测结果表明:土层水平最大剪应变在唐山地震前有异常,异常后便发生了主震;异常时间等值线从震中向外围传播,其传播速度为每天0.1—6.6公里,从震中区向外围加快,以沿着通过唐山主震震中区的北东和北西向断裂带的传播速度为最快;最高等值线圈闭震中或在震中附近。
The observation results of the soil strain gauges observation network show that the maximum horizontal shear strain at the soil layer was anomalous before the Tangshan earthquake and the main shock occurred after the anomaly. The anomalous time contour was propagated from the epicenter to the periphery with a propagation velocity of 0.1- 6.6 kilometers from the epicenter to the outer periphery to speed up to the fastest along the northeaster and northwesterly faults passing through the epicenter of the Tangshan epicenter; the closure of the highest equivalent coil or near the epicenter.