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通过一年多对四川地区地震活动性的前兆研究进行清理,就以下几项课题的研究情况做一概述。 1.地震空区 笔者和席敦礼采用从R-t图寻找平静段,再在相应时段震中分布图上结合构造条件圈定平面空区的办法,对1970年7月到1983年6月四川地区有资料的16组5级以上地震前是否出现空区进行了清理,结果有10组在震前出现空区,占5/8,2组7级以上地震前均出现空区,5组6.0—6.9级地震中,有4组震前出现空区。根据空区形成过程,可分
After more than a year cleaning up the precursory study of seismicity in Sichuan Province, this paper gives an overview of the research on the following topics. 1. The author of the earthquake-stricken area and Xi Dunliu used to find the calm section from the Rt map, and then in the corresponding period of epicenter distribution map combined with structural conditions delineation of flat area approach to July 1970 to June 1983 with data in Sichuan Province 16 There were no vacant areas before the M5 + M5 earthquakes. As a result, there were 10 groups of vacant areas before the quake, accounting for 5/8 or 2 and 7 groups of vacant areas before the quake. In the 5 groups of 6.0-6.9 earthquakes There are 4 groups of vacant areas before the earthquake. According to the process of the formation of empty areas, can be divided