郯庐断裂带渤海段第四纪活动规律探讨  

Analysis of Quaternary activity along the Bohai segment of the Tan-Lu Fault Zone

作　　者：胡惟[1] 朱光[1] 宋利宏[1] 严乐佳[1] 刘备[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《地学前缘》2013年第4期137-150,共14页Earth Science Frontiers

基　　金：中国地质调查局项目(1212011120104);国家自然科学基金重大研究计划项目(91214301)

摘　　要：郯庐断裂带渤海段也称为营潍断裂带。文中利用一系列地震剖面,对营潍断裂带第四纪活断层的几何学特征、活动方式与时间、应力场及活动性进行了综合分析,探讨其第四纪活动规律。结果表明,该断裂带第四纪以来活动广泛而强烈,基本上继承了新近纪的断裂格局,由东、西两支主干断裂构成,各自呈左阶雁列式展布。其主干断裂在第四系内陡立的断面、常见的第四系背斜构造及区域上NEE SWW向挤压应力状态,皆表明该断裂带第四纪以来呈逆右行平移活动。大量的地震剖面揭示,该断裂带渤中地区为全新世活断层,而潍北—莱州湾和辽东湾地区呈现为全新世、晚更新世与第四纪活断层相间出现的现象。地震分布表明,该断裂带近代在中段渤中地区活动性最强,而南、北段活动性较弱。The Bohai segment of the Tan-Lu Fault Zone is also called the Yingwei Fault Zone.On the basis of a series of seismic profiles,the Quaternary activities of the Yingwei Fault Zone,including fault geometry,the mode and time of the activities,and the stress field and activity,are analyzed in this study.The results show that the activities of the fault zone are extensive and intense since the Quaternary.Active faults in the zone mostly inherited Neogene faults,and are composed of eastern and western major faults.Each of the two major faults shows left-stepped,en echelon arrangement.Their steeply-dipping fault planes in the Quaternary sediments,the common Quaternary anticlines and the ENE WSW regional compression stress field all suggested that the fault zone has undergone the reverse dextral slip since the Quaternary.Many seismic profiles revealed that the active faults in the Bozhong area,the center of the Bohai Sea,are active since the Holocene,whereas in the Weibei,Laizhou Bay and Liaodong Bay areas,the active faults were alternately present in the Holocene,the Late Pleistocene and the Quaternary.Earthquake distribution shows that recent fault activity is most intense in the Bozhong area and relatively weak along the northern and southern segments.

关 键 词：营潍断裂带 第四纪 活断层 逆右行平移 渤海 

分 类 号：P546[天文地球—构造地质学]