• 首页关于本刊投稿须知期刊订阅编委会期刊合作查看检索English
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 1625次   下载 1729 本文二维码信息
码上扫一扫!
分享到: 微信 更多
天津汉沽断裂准确位置及活动性的综合探测研究
闫成国,王志胜,陈宇坤,任峰,高武平
天津市地震局,天津市河西区友谊路19 号300201
摘要:
天津汉沽隐伏断裂属于滨海平原区隐伏断裂。本文采用化探、浅层地震勘探和联合钻孔剖面探测等方法,并结合年代样品测试对汉沽断裂进行了综合探测研究,首次查明了汉沽断裂的准确空间位置和晚第四纪活动性。探测结果表明,汉沽隐伏断裂最新上断点埋深25. 8m,断距为2. 15m。结合光释光年代样品测试结果,推断其最新活动时代为49. 3ka ~ 65kaBP,属晚更新世中期活动断裂。由于该断层是与主断层倾向相反的次级断层,可能并不是震源断层错动在地表的直接反映,同时汉沽断裂晚更新世早期以来的平均滑动速率为0. 063mm / a,明显低于海河断裂东段晚更新世以来0. 141mm / a 的平均滑动速率,这都表明汉沽隐伏断裂的活动强度并不是很大,应是一具有中等活动强度的活动断裂。
关键词:  汉沽断裂  滑动速率  活动性  综合探测研究
DOI:
分类号:
基金项目:天津市“十一·五”地震安全基础工程(津发改投资[2009]1039 号)、天津市矿产资源补偿费地质项目(国土房任[2012]14 号)共同资助
Comprehensive survey and investigation on the exact spatial location and activity of the Hangu fault in Tianjin
Yan Chengguo, Wang Zhisheng, Chen Yukun, Ren Feng, Gao Wuping
Earthquake Administration of Tianjin Municipality,Tianjin 300201,China
Abstract:
The Hangu buried fault in Tianjin belongs to the buried fault of coastal plain area. The paper used methods of geochemical exploration,shallow seismic exploration,drilling exploration and sample age to survey and research on the Hangu buried fault. This is the first identification of the exact spatial location and the Late Quaternary activity of the Hangu buried fault. The results showed that the depth of the latest upper break point of Hangu buried fault is 25. 8m,fault throw is 2. 15m. Combining with the test results of the optically stimulated luminescence dating sample, we found that the latest active age is between 49. 3ka ~ 65ka BP,which belongs to the late Pleistocene active fault. But the fault is secondary fault,with a tendency opposite to the main fault. The fault may not be the direct reaction of the earthquake source fault on the surface,and the slip rate of Hangu fault since the early Late Pleistocene is 0. 063mm / a,significantly lower than the eastern section of the Haihe fault which has an average slip rate of 0. 141mm / a since the Late Pleistocene. All this indicates that the activity strength of Hangu buried fault is not strong, an active fault of moderate activity level with the maximum potential earthquake with MS6. 5.
Key words:  Hangu fault  Slip rate  Activity  Comprehensive survey and investigation