Activity of Central Segment, Changde-Yiyang-Changshan Fault at the Southern Margin of Dongting Basin, Hunan Province, China
摘要
According to the detailed shallow geophysical survey, drilling, dating,geological geomorphic investigation along the central segment of the Changde-Yiyang-Changshan fault at the southern margin of Dongting Basin, features about its geometry, dynamics, active epochs and basin structural type are revealed. Based on the comparison of fault-controlled subsidence and sediment thickness, it can be concluded that the Anxiang-Hanshou Depression was formed mainly by deformation, not by faulting. Both faults and moderate earthquakes are concentrated along the zones between Dongting Basin and surrounding uplifting mountains.