天津塘沽地区海河断裂的浅部构造特征  

Shallow Tectonic Characteristics of the Haihe Fault in Tanggu Area,Tianjin Municipality

作　　者：郑彦鹏[1] 王勇[1] 陈宇坤[2] 韩国忠[1] 

机构地区：[1]国家海洋局第一海洋研究所 [2]天津市地震局,天津300201

出　　处：《海洋科学进展》2006年第3期307-313,共7页Advances in Marine Science

基　　金：国家高技术研究发展计划项目---海洋资源开发技术(2003AA602190);国家自然科学基金项目---台湾以东海域加瓜"楔形"带的构造演化及其对冲绳海槽弧后二次扩张的影响(40406013)

摘　　要：基于在海河上开展水上人工地震探删获得的高分辨率浅部声学地震剖面，结合钻孔获得的年代地层资料．对海河断裂在天津塘洁地区的浅部地层结构扣断层活动特征进行了研究。研究结果表明，天津塘洁地区晚第四纪地层中的4个海相层具有层位稳定、地震相易于连续追踪的特点。在声学地震剖面上，自河底R0向下可识别出R1，R2，R3，R4，R5，R6，R7，R8和R9反射波组界面，可分别作为全新世陆相层、第Ⅰ海相层、海陆交互相地层、第Ⅱ陆相层、第Ⅱ海相层、第Ⅲ陆相层、第Ⅲ海相层、第Ⅳ陆相层、第Ⅳ海相层等地层单元之间的界限。此外，研究证实海河断裂在天津塘沽地区的上断点位于河面以下50～55ms深处，与钻孔资料基本吻合，海河断裂的最新活动时间大约在晚更新世晚期。In this paper, based on the high-resolution acoustic seismic profile data and the borehole stratigraphic data surveyed in the Haihe River area, the shallow stratigraphic structures and fault activity characteristics of the HaiheFault in Tanggu area, Tianjin municipality are studied. It is shown from the study results that 4 marine facies strata in the late Quaternary stratum are characrized by steady horizon and seismic facies easy to be traced. On the acoustic seismic profile, reflectors R1,R2,R3,R4,R5,R6.R7,R8 and R9 are identified downward from the riverbed reflector R0, and they are boundaries between two stratigraphic units, including Holocene land facies stratum, marine facies stratum Ⅰ ,marine-land alternating facies stratum, land facies stratum Ⅱ , marine facies stratum Ⅱ , land facies stratum Ⅲ, marine facies stratum Ⅲ , land facies stratum Ⅳ- and marine facies stratum Ⅳ, respectively. In addition, it is shown from the study results that the upper breaking points of the Haihe Fault in the area are located at 50 to 55 ms depths below the Haihe River surface, which is basically consistent with the borehole data. and the latest active period of the Heihe Fault is about in the late stage of latc Pleistocene.

关 键 词：海河断裂 海相层 上断点 断层活动特征 

分 类 号：P736[天文地球—海洋地质]