地震方法探测太行山山前断裂的活动特征(英文)

太行山山前断裂位于太行山脉与华北平原过渡地带,是华北及我国东部地区一条重要的构造带,有关该断裂带的活动性有以下观点:1)它属深大断裂带;2)它是活动断裂带和地震构造带;3)它不是地震构造带。。为研究和评价该断裂的活动性,利用最近获得的地震资料和钻探联合剖面研究了太行山山前断裂的深部构造背景和第四系以来的活动特征。钻探验证以及研究结果与表明:太行山山前断裂不是岩石圈深大断裂,该断裂在第四系仅错断了中更新世QP2早期,中更新世QP2晚期和晚更新世地层没有发生错断。由此得出,太行山山前断裂不是活动断裂,也不是岩石圈深大断裂。该研究结果为跨越太行山山前断裂的城市进行规划和建设提供了重要的地质和地球物理资料,对于首都圈地震危险性评价也具有十分重要的意义。

Seismic analysis of the active character of the Taihang Mountain piedmont fault

The Taihang Mountain piedmont fault is a large-scale structure zone in north and east China which cross Beijing, with the NE-NNE extent spans approximately 620 km. It is very important to determine the fault zone activity due to the close relation of active structures and earthquakes. Regarding the fault activity, there are three different opinions: 1) it is a large deep fault zone; 2) it is an active fault zone and an earthquake structure belt; and 3) it is not an earthquake structure belt. In order to ascertain the active character of the fault, the deep tectonic setting and the activity since the Quaternary were investigated using recent seismic and drilling data to make a joint interpretation. The investigation results show that the Taihang Mountain piedmont fault is not a large lithospheric fault because the early middle Pleistocene (Q_P2) layers are offset by the fault and the late middle Pleistocene (Q_P2) and late Pleistocene layers are not offset by the fault. We determine that the Taihang Mountain piedmont fault in the area is not an active fault and is also not a large lithospheric fault. This study result provides important geological and geophysical data for city planning and construction in Hebei province and, especially, has great significance for seismic hazard assessment of the capital area.