渤海湾西南缘及其邻近地区地壳结构特征  

CRUSTAL STRUCTURE AND ITS FEATURES IN THE SOUTHWEST MARGIN OF BOHAI BAY AND ADJACENT AREAS

作　　者：王帅军[1] 王夫运[1] 张建狮[1] 郑彦鹏[2] 张成科[1] 赵金仁[1] 刘宝峰[1] 黄灿 

机构地区：[1]中国地震局地球物理勘探中心,郑州450002 [2]国家海洋局第一海洋研究所,青岛266061 [3]郑州地震台,郑州450062

出　　处：《地震地质》2013年第2期278-289,共12页Seismology and Geology

基　　金：863项目"海陆联合深部地球物理探测关键技术研究"(2009AA093401)资助;中国地震局地球物理勘探中心论著号RCEG201113

摘　　要：利用2011年8月在渤海湾的探测剖面资料及其周缘地震测深剖面的结果,对渤海湾探测剖面的数据资料进行一、二维处理,计算和综合解释研究,获得了渤海湾西南缘及其邻近地区二维地壳速度结构和构造的基本特征、断层的空间展布特征和深浅部地质构造环境等。研究结果表明,沿剖面具有明显的层状结构,不同区域的地壳速度结构在纵向和横向上均具有明显的非均匀性。基底厚度由渤海湾附近向SW方向逐渐减薄,在220km桩号下方G界面的埋深为7.4km。中间层厚度变化较大,变化幅度达4.0km。莫霍面由沿海向SW方向逐渐加深,变化幅度为2.0km左右。DSS data of Bohai Bay profile was processed in August 2011 and the result obtained in this paper and the results of other profiles, which cross this profile, were interpreted comprehensively in this pa- per. The DSS data were calculated and interpreted synthetically using 1-D and 2-D processing tech- niques in order to find out the basic features of 2-D velocity structures, spatial distribution of faults, ge- ological structure of shallow and deep crust in the southwest margin of Bohai Bay and adjacent areas. The result shows that obvious layered structure appears along the profile, and the crustal velocity struc- tures in different regions have obvious heterogeneity in the lateral and vertical directions. The crystal- line basement near the Bohai Bay is gradually thinning southwestwards, and beneath the 220km Stake, the depth of G interface is 7.4km. The thickness of the middle layer varies greatly,with the change range up to 4.0km. The crustal depth varies relatively moderately, with a change range of about 2.0km. The Moho deepens gradually from coastal area to the inland along the southwest direction.

关 键 词：地震测深 速度结构 地壳 渤海湾 

分 类 号：P313[天文地球—固体地球物理学]