强余震的断层面解特征

本文分析了我国及邻区16次大地震的前震、主震和强余震的断层面解.其结果表明:前震和主震具有很好的一致性;一部分强余震同主震相比具有明显的差异, 具有明显差异的强余震发生的时间, 一般都在主震之后的一、二天内.这些特点有助于对地震趋势的估计.断层面解的差异性可能由于局部应力场引起, 也可能由于震源区断层面错动性质的多样性所致. 

THE CHARACTERISTICS OF FAULT PLANE SOLUTIONS OF STRONG AFTERSHOCKS

In this paper, We studied fault plane solutions of 16 main shocks as well as their foreshocks and strong aftershocks occurred in China and its vicinity. The results show that the fault plane solutions of the foreshocks are rather consistent with that of the main shocks, but some of the aftershocks occurred generally in a day or two after the main shocks are markedly different. The above characteristics might help to estimate the tendency of occurrence of large earthquakes.This difference in fault plane solution may be caused by either local stress field or by various complicated dislocations along fault planes in the focal regions.