1975年海城地震和1976年和林格尔强震与1976年唐山大震的关系讨论

A Discussion on the Relationship among the 1975 Haicheng, the 1976 Horinger Strong Earthquakes and the 1976 Tangshan Earthquake

从北纬40°纬向地震带活动的关系探讨了华北3次强震发生的同时性的原因,这条EW向地震带首先发生的地震传递的能量促使唐山积累了发震能量,而另一条由邢台、河间NE走向的下地壳蠕滑断层的能量传至唐山断层后,解锁了该孕震断层,从而发生了唐山大震。地震波的触发作用也是同步的另一个原因,除了震动的断层面的直接触发之外,对组合模式中单地震波的积累与调整也会产生触发作用而改变其性质。另外还从中国8级大地震发生的25年周期讨论了同步性。

The reason why the three strong earthquakes(the 1975 Haicheng,the 1976 Horinger,and the 1976 Tangshan earthquakes)occurred at the same period is discussed in this paper based on the relationship among the seismic activities along the seismic zone in north latitude 40°.The energy transmitted from the 1975 Haicheng and the 1976 Horinger earthquakes which first occurred on the seismic zone made the seismogenic energy accumulate in Tangshan area;while the energy of another NE-trending creep slip fault in lower crust transmitted to Tangshan fault and unlocked the fault,then the Tangshan earthquake occurred.The trigger action of seismic waves was another reason.Besides the direct trigger of fault plane,the accumulation and adjustment of single seismic wave in the combined mode will also act as a trigger.In addition,the synchronization is also discussed from the cycle of 25 yeas of the M=8 earthquakes in China.