合肥盆地东缘北西向断裂活动性  

Activity of Northwestward Faults in Segment of Hefei Basin

作　　者：方良好 郑颖平[1,2] 疏鹏 路硕 杨源源[1,2] 李鹏飞 FANG Lianghao;ZHENG Yingping;SHU Peng;LU Shuo;YANG Yuanyuan;LI Pengfei(Anhui Earthquake Agency,Hefei 230031,China;Key Laboratory of Research on the South Section of the Tan-Lu Fault Zone,Hefei 230031,China)

机构地区：[1]安徽省地震局,合肥230031 [2]郯庐断裂带中南段重点研究室,合肥230031

出　　处：《华北地震科学》2020年第3期6-12,共7页North China Earthquake Sciences

基　　金：“合肥市地震活断层探测及地震危险性分析”项目;安徽省地震科研青年基金(20170614)。

摘　　要：对合肥盆地东缘基岩区的NW向断层剖面进行了观察和年代样品测试,并跨其中1条断层布设了浅层地震勘探测线;结合本区第四系厚度和沉积特征,对浅震测线时间剖面进行了地质解释。根据调查所揭示的剖面特征、断层泥ESR测年数据、浅层地震勘探结果及本区的中强地震活动构造背景,认为这组NW向断裂中更新世有过活动;合肥盆地东缘NW向横向断裂的第四纪活动情况与断裂所在地区的新构造环境有关,尽管断层泥测年结果表明断裂在中更新世有过活动,但其活动强度不大。There are a series of NW transverse faults along the eastern margin of the Hefei basin. We analyzed and sampled the NW fault profiles in the bedrock outcropping area and constructed shallow seismic lines across one of the faults. Based on the Quaternary thickness and sedimentary characteristics of this area, geological interpretation of shallow seismic profile is made. The profile characteristics and the ESR dating of fault gouges indicate that the NW faults have been active in the Middle Pleistocene. The Quaternary activity of the NW transverse faults in the eastern margin of the Hefei basin are related to the neotectonic environment in the area. Although the results of gouge dating show that the faults have been active in the Middle Pleistocene, theirs activity are not strong.

关 键 词：郯庐断裂带 合肥盆地 NW向横向断裂 断裂活动性 

分 类 号：P315.2[天文地球—地震学]