Hubei Badong area,decollement,Three Gorges reservoir,seismic activity," />
湖北巴东,滑脱构造,三峡水库,地震,"/>
Through review of thin crust structure studies in east Sichuan and western Hubei area, along with experimental results of rock mechanics in recent years, this article suggests that there exist four soft layers to form slippage system, including the Triassic Badong group, the lower Triassic Daye group, the lower Permian Qixia group, and lower Silurian Luoreping group. Combined with geophysical detection results of the Three Gorges region, we build a theory model of multilayer decollement in the Badong area.We find that the spatial distribution of seismic activity in this area aligns with the decollement geometry very well, that seismic activity is distributed along the direction of the 3 NE stripping joints in the area and less in the core of the anticline, that earthquakes occurring in the anticline core are less than in the two wings, and larger earthquakes tend to occur in the depths of the two wings. Finally, we believe that the decollement, limestone areas, and the fluctuation of water level are three essential factors of seismic activity complexity in Badong area."/>
Hubei Badong area,decollement,Three Gorges reservoir,seismic activity,"/>
Decollement Structures and Seismic Activity of Badong Area in Hubei Province
Abstract Through review of thin crust structure studies in east Sichuan and western Hubei area, along with experimental results of rock mechanics in recent years, this article suggests that there exist four soft layers to form slippage system, including the Triassic Badong group, the lower Triassic Daye group, the lower Permian Qixia group, and lower Silurian Luoreping group. Combined with geophysical detection results of the Three Gorges region, we build a theory model of multilayer decollement in the Badong area.We find that the spatial distribution of seismic activity in this area aligns with the decollement geometry very well, that seismic activity is distributed along the direction of the 3 NE stripping joints in the area and less in the core of the anticline, that earthquakes occurring in the anticline core are less than in the two wings, and larger earthquakes tend to occur in the depths of the two wings. Finally, we believe that the decollement, limestone areas, and the fluctuation of water level are three essential factors of seismic activity complexity in Badong area.
