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本文从理论上研究了贯通地壳的两条相互平行的滑动—弱化走滑断层的相互作用问题。采用有限单元—松驰迭代方法对位移场、应力场、应变场以及弹性应变能随时间的变化进行了数值分析,所得结果揭示了几次大地震相继发生的前兆异常迭加问题。特别,讨论了作为1975年海城7.3级地震预报主要依据之一的金县短水准在1976年唐山7.8级地震前未出现异常,而大灰厂短水准测值却有明显异常的原因。
In this paper, the interaction between two parallel slip-weakening strike-slip faults that cross the crust is theoretically studied. Numerical analysis of the displacement field, stress field, strain field and elastic strain energy with time are carried out by means of finite element-relaxation iteration method. The results reveal the successive superposition of precursory anomalies caused by several large earthquakes. In particular, it is discussed that there was no anomaly before the MS7.8 Tangshan earthquake in 1976, which was the main basis for the prediction of the magnitude 7.3 Haicheng earthquake in 1975. However, the short-range measurements of the large ash plant were obviously abnormal.