从北华北盆地的地质结构看1976年唐山地震的发震机理  

A discussion on the generating mechanism of 1976 Tangshan earthquake based on the geologic structure of northern Huabei Basin.

作　　者：杨克绳[1] 胡平[2] 党晓春 

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司研究院,河北涿州072751 [2]北京市地震局,北京100080 [3]东方地球物理勘探有限公司物探技术研究中心,河北涿州072751

出　　处：《地学前缘》2010年第5期263-270,共8页Earth Science Frontiers

基　　金：北京锐浪公司资助项目

摘　　要：北华北盆地经过古近纪拉张、新近纪挤压形成了怀柔—三河—唐山—锦州—下辽河向南突出的弧形构造带,它与向南推挤的南北向唐山—丰南隆起一起构成燕辽山字型构造。唐山—丰南脊柱向南推挤造成弧顶挤压应力集中。一旦应力集中超过极限值,应力必然释放,形成大地震。文章从这一认识出发对1976年唐山地震的发震机理进行了探讨。In the northern Huabei Basin,the Yanliao epsilon-shaped structure is composed of the Huairou-Sanhe-Tangshan-Jinzhou-Xialiaohe arcuate structure belt and the NS-trending Tangshan-Fengnan uplift that were formed by the Palaeogene extension and Neogene compression.The backbone of Tangshan-Fengnan uplift pushed southward and made the compressive stress concentrate at the apex of the arcuate structure belt.The stress would be released when it exceeded the limiting value,and caused the earthquake.It is the generating mechanism of 1976 Tangshan earthquake proposed in this paper.

关 键 词：北华北盆地 燕辽山字型构造 唐山—丰南脊柱 1976年唐山大地震 

分 类 号：P315.2[天文地球—地震学]