海城和唐山区域深部结构及其与大震类型的关系
THE DEEP STRUCTURES AND THE TYPES OF THE EARTHQUAKES OCCURRED IN HAICHENG AND TANGSHAN AREA
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摘要: 本文采用Haskell矩阵及改进的Delta矩阵分解形式的快速算法,通过调整介质模型,计算综合地震图,并与深源远震记录波形对比,获得了海城和唐山区域介质结构参数。从介质结构角度,对两震区的发震背景进行了讨论,指出:两区域深部介质层结构均有不同程度的起伏,可能是应力场易集聚区大震发生的背景条件之一;而两区域在介质起伏部位,各层内速度等细节上的差异,又可能是两大震发震方式不同的一个可能原因。Abstract: In this paper, the deep structures beneath Haicheug and Tangshan area have been obtained by the way of fitting synthetic seismograms with P waveforms of the deep focus teleseismic records. From these results, the types of the earthquakes occurred have been discussed for two area. We have proposed that there are the accidented deep layer structure in two earthquake area. These may be why the different earthquakes in Haicheng and Tangshanarea have occurred,
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[1] 李幼铭等,层状介质中地震P-SV波广义透射系数计算,地球物理学报, 26,增刊,1983. [2] 朱培定,李幼铭,利用深源远震记录波形研究台站区域的介质结构,地球物理学报, 28,1,985.
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