Abstract:

Based on systematic geologic mapping,we found that the active fault in the Tancheng-Lujiang fault zone is not continuous and can be divided into three independent rupture segments,which are Anqiu segment,Juxian-Tancheng segment and Xinyi-Sihong segment．The geometrical pattern,displacment amount and strong earthquake recurrence interval on these three seg-ments are obviously different．Each segment responds to the maximum rupture length of a strongearthquake.At the separation of the segments,the faults are arranged in left-stepover,where an 8～10km wide local uplift was formed．The local uplifts serve as the barriers between the segments.By analysing the strong earthquake recurrence intervals and the age of the latest activity ofeach segment,we suggest that the Xinyi-Sihong segment is the most dangerous segment in thefuture,the Anqiu segment is the secondary one and the Juxian-Tancheng segment has little possibility to suffer the strong earthquake.

Key words: Tancheng-Lujiang fault zone, Fault segmentation, Barrier, Strong earthquake risk

摘要：

郯庐活断层长360km,通过系统的填图可将其分为3个独立的活断层破裂段。对每段的几何形态、最新活动时代、大震复发间隔、现今活动状态以及分段障碍体等作了介绍,并对各段未来的大震危险性做了初步分析。

关键词: 郯庐断裂带, 活断层分段, 障碍体, 大震危险性