SEISMOLOGY AND GEOLOGY ›› 2004, Vol. 26 ›› Issue (1): 111-121.

• Brief Report • Previous Articles     Next Articles

CHARACTERISTICS OF LATE QUATERNARY ACTIVITY OF THE HAIHE BURIED FAULT IN TIANJIN MUNICIPALITY

CHEN Yu-kun1,2, REN Feng1, ZHANG Cui-fen1, SHAO Yong-xin1   

  1. 1. Earthquake Administration of Tianjin Municipality, Tianjin 300201, China;
    2. Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2002-12-29 Revised:2003-07-13 Online:2004-03-04 Published:2009-10-26

天津海河隐伏断裂的晚第四纪活动特征研究

陈宇坤1,2, 任峰1, 张翠芬1, 邵永新1   

  1. 1. 天津市地震局, 300201, 天津;
    2. 中国地震局地质研究所, 100029, 北京
  • 作者简介:陈宇坤,男,1970年生,1997年毕业于国家地震局兰州地震研究所,获地震地质专业硕士学位,中国地震局地质研究所在职博士研究生,副研究员,主要从事地震地质、活动构造、工程地震方面的研究,电话:022-28371762,E-mail:chenyukun@mail.eq-tj.ac.cn.
  • 基金资助:
    天津市海河隐伏断裂活动性定量评价项目(津计290)、地震科学联合基金(6002003)与天津市地震局中青年基金(024012)共同资助.

Abstract: On the basis of precise locating of the Haihe buried fault, the characteristics of late Quaternary activity of the fault was identified through drilling, identification of microfossils, stratigraphic correlation and chronological dating, by taking 4 marine strata of late Quaternary ages in Tianjin area as key horizon. The result indicates that the upper breaking point of the Haihe Fault in Tianjin downtown area is buried 21m below ground surface, and the corresponding latest movement of the fault had continued through the late stage of late Pleistocene to the early stage of Holocene. On the Tanggu segment of the fault, however, the upper breaking point is buried 16.4m deep, and its latest active period was in the early and middle stage of Holocene. Therefore, the average vertical movement rate on Tianjin downtown segment since the late stage of late Pleistocene (36,290a BP) can be estimated as 0.248mm/yr, and that on the Tanggu segment since the middle stage of Holocene (7200a BP) may reach 0.333mm/yr. This may indicate that the activity of the Haihe Fault on Tanggu segment (eastern segment) is obviously stronger than that on the Tianjin downtown segment (western segment).

Key words: buried fault, marine strata, stratigraphic correlation, upper breaking point, movement rate, characteristics of fault activity

摘要: 在海河隐伏断裂精确定位的基础上,文中利用天津地区晚第四纪地层中的4个海相地层作为标志层,通过地质钻孔勘探、微体古生物鉴定、地层对比及年代学测定和研究,获得了海河断裂的晚第四纪活动特征.研究表明,海河断裂在天津市区段的上断点埋深为21m,对应的最新活动时代为晚更新世晚期至全新世早、中期,塘沽区段的上断点埋深为16.4m,最新活动时代已进入了全新世早、中期;天津市区段在晚更新世晚期(36 290a BP)以来,垂直运动速度为0.248mm/a,塘沽区段全新世(7 200a BP)以来的平均垂直运动速率为0.333mm/a.这表明海河断裂塘沽区段(东段)的活动性明显高于市区段(西段).

关键词: 隐伏断裂, 海相层, 地层对比, 上断点, 运动速率, 活动特征

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