兰聊断裂南段构造样式与最新活动性分析

兰聊断裂南段构造样式复杂，分段活动特征明显。已有学者针对兰聊断裂的研究，主要集中在范县—东明县一带，而兰聊断裂南段的构造样式与最新活动性研究匮乏。为此采用地震反射剖面与钻孔联合剖面探测方法，对兰聊断裂南段进行较系统地分析，认为兰聊断裂南段构造样式为伸展走滑断裂尾端“马尾扇”结构，其最新活动时代为中更新世中晚期，晚更新世以来未活动，中更新世最大滑动速率为0.061 mm/a，据此判断兰聊断裂南段为中更新世断裂。

Structural Style and Latest Activity Analysis of the Southern Segment of the Lanliao Fault

The southern segment of the Lanliao Fault has a complex structural style and obvious features of segmental activity. Previous researches on the Lanliao Fault mainly focused on the Fanxian-Dongming county area, while the structural style and latest activity of the southern segment of the Lanliao Fault were lacking. In this study, the artificial seismic reflection profile and the composite drilling geological sections are used to systematically analyze the southern segment of the Lanliao Fault. It is considered that the structural style of the southern segment of the Lanliao Fault is an extensional imbricate fans (horsetail splay). Its latest active era is the middle and late Middle Pleistocene, and it is inactive since the Late Pleistocene. The maximum slip rate of the Middle Pleistocene is 0.061 mm/a. Based on this, it can be concluded that the southern segment of the Lanliao Fault is a Middle Pleistocene fault.