Abstract: Jianghan-Dongting Lake basin is a large-scale Meso-Cenozoic basin in South China. Its geological structure, deep-seated structure, tectonic evolution, neotectonic activity and seismicity are analysed basing on the data of geology, geophysis and earthquakes in the basin region.The basin consists of Jianghan and Dongting Lake depressions and Huarong uplift. WNW-EW-trending secondary segs and positive land forms controlled by the faults developed in Jianghan depression, but NEN-NE striking secondary positive forms and segs controlled by the faults developed in Dongting Lake depression. The basin has undergone a complex process o'f tectonic evolution. There is intensive neotectonic activity in the basin region. Mid-intensity earthquakes are closely related to the structures with differential activities in Quaternary.

Key words: Jianghan-Dongting Lake basin, Rifting, Seismicity

摘要： 本文根据地质、地球物理和地震等资料,初步分析了江汉-洞庭盆地构造及其演化和地震活动的基本特征。此盆地由江汉坳陷、华容隆起和洞庭湖坳陷组成,整个盆地呈现二坳一隆、多凹多凸的构造特征。盆地之下是低缓的北东向莫霍面隆起带,埋深30—31km。自早白垩世至第四纪盆地经历了裂陷、强烈裂陷和区域性沉降等复杂过程,第四纪仍存在一定程度的断裂活动和断块差异活动。盆地区有中强地震和小震活动,地震带基本位于第四纪差异活动较明显的地区和莫霍面隆起的斜坡带。

关键词: 江汉-洞庭盆地, 裂陷作用, 地震活动性