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1975—1979年间在京津唐地区完成了八条地震转换波测深的剖面工作,本文介绍所取得的主要成果。结果表明转换波法用于地壳、上地幔深部结构的探测是有效的。深部构造剖面与震源分布的对比表明,本区几乎所有强震震源都分布在“花岗岩”层的某些特殊部位上。唐山和马坊大震地区的深部构造具有相似的特征,这就是“花岗岩”层的相对隆起,上地幔界面的强烈凹陷,岩石圈相应地急剧增厚以及存在深大断裂。
During the period from 1975 to 1979, eight sections of seismic converted sounding profiles were completed in Beijing, Tianjin and Tangshan area. The main achievements of this paper are introduced. The results show that the conversion wave method is effective for detecting the deep structure of the crust and upper mantle. Comparisons of deep tectonic profiles and source distributions show that almost all the strong earthquakes in this area are distributed over some special parts of the “granite” layer. The deep tectonics in Tangshan and Mafang great earthquakes have similar features. This is the relative uplift of the “granite” layer, the intense depression in the upper mantle interface, the sharp increase in lithosphere and the deep fault.