相关性地震活动的跨越式分布与地壳屈曲

本文主要讨论与地壳屈曲有关的相关问题,它将依据地壳屈曲的结果,用找最不稳定位置的方法,说明地震活动呈条带、网络分布的可能原因,同时对相关地震的跨越分布和强震前兆灵敏点的不连续分布也作了力学解释。值得提出的是,从地壳屈曲导出的失稳优势方向分布与呈网络图象分布的唐山、海城、渤海等强震的发震构造其走向是一致的。这就部分地回答了,为什么在一不大的区域中,唐山—邢台一线上的强震发震构造为北东向,而海城—渤海一线上强震发震构造为北西向的原因。

LEAP DISTRIBUTION OF CORRELATIVE SEISMIC ACTIVITY AND THE STRATA YIELD-BUCKLING

Based on the results of strata yield-buckling, this paper explicates thepossible cause of a belting and netting distribution of the seismic activitiesby means of finding the most unstable location. It also dynamicallyexplaned the leap distribution of correlative earthquakes and the disconti-nuous distribution of the precursory sensitive points. It is pointed out that the dominant fracture direction derived from stratabuckling coincides with the generating structures of strong earthquakes, e.g. Tangshan, Haicheng, and Bohai Sea area, which have shown a nettingpattern distribution. This feature gives a satisfactory answer to such aquestion: within a relatively small region, the earthquake generating struc-tures in Tangshan-Xingtai area are of NE direction, where as those inHaicheng-Bohai Sea area NW. The correlative character from the research of seismic active field isuseful for the reasonable seismic zoning etc.