湖北省宜都潘家湾M_s4.9级地震发震构造标志研究  

STUDY ON THE SEISMOGENIC STRUCTURE MARKS OF THE PANJIAWAN Ms4.9 EARTHQUAKE OF HUBEI

作　　者：韩晓光[1] 李安然 张飞飞[1] 岳书玉 

机构地区：[1]国家地震局地震研究所

出　　处：《地壳形变与地震》1991年第2期75-81,共7页Crustal Deformation and Earthquake

摘　　要：1961年3月8日潘家湾地震(M_S=4.9)是发生在鄂西三峡地区的中强地震之一。通过宏观考察和地质构造调查,对这次地震发震构造条件进行了研究,其地震构造标志可归纳如下: (1)地球物理场梯级带,尤其是位于中国东部重力梯级带东缘附近,也大致位于地壳深部界面拗折带边缘; (2)新构造期以来地壳运动大型隆起带前缘与黄陵背斜刚性块体顶端相迭合部位; (3)以仙女山断裂为主体的近南北向断裂密集发育地带,地质上形成的地堑地垒组合而成之条块地质结构以及溶蚀洼地与垄岗相间排列的地貌格局; (4)在近东西向褶皱带背景上发育的南北向张性断裂系统并适应了现代应力场作用,易于产生新的活动。Based on the field survey of macroscopic seismic phenomenon and geological structure, the seismogenic structure environment of Panjiawan earthquake(Ms4.9) are studied in this paper. The seismotectonic marks can be summarized as follows:1. The gradient belt of geophysieal field, i, e. the east edge of gravity gradient belt and the edge of contraflexure belt of Moho surface.2. The overlapping position of the leading edge of big crustal uplifted belt since the Neofectonic period and the top of the rigid block of Huang Lin anticline. 3. The dense developmental and near SN fracture belt, which mainly consists of the Xian Nushan Mt., the strip and block geological texture composed by the trough and the horst, and the geomorphic structure arranged alternatively by the corroded depression and the mound.4. The SN tension fault system, which is developed on the tectonic background of near EW fold belt, and the new mobile zone which is easy produced due to suitability to the action of in-site stress field.

关 键 词：地震 发震构造 湖北 

分 类 号：P315.2[天文地球—地震学]