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郯庐活断层的分段及其大震危险性分析
SEGMENTATION OF ACTIVE FAULT ALONG THE TANCHENG-LUJIANG FAULT ZONE AND EVALUATION OF 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。
【Abstract】 Based on systematic geologic mapping,we found that the active fault in the Tancheng-Lu-jiang 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 geometri-cal 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 an8~10km wide local uplift was formed.The local uplifts serve as the barriers between the seg-ments.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 pos-sibility to suffer the strong earthquake.
【Key words】 :Tancheng-Lujiang fault zone; Fault segmentation; Barrier; Strong earthquake risk;
- 【文献出处】 地震地质 ,SEISMOLOGY AND GEOLOGY , 编辑部邮箱 ,1994年02期
- 【分类号】P315.2
- 【被引频次】112
- 【下载频次】464