首页 | 本学科首页   官方微博 | 高级检索  
     检索      

用深地震反射方法研究邢台地震区地壳细结构
引用本文:王椿镛,王贵美.用深地震反射方法研究邢台地震区地壳细结构[J].地球物理学报,1993,36(4):445-452.
作者姓名:王椿镛  王贵美
作者单位:1. 国家地震局地球物理研究所,北京 100081; 2. 地震技术专科学校,河北三河 101601; 3. 江苏省地震局,南京 210014; 4. 山东省地震局,济南 250021; 5. 国家地震局地球物理勘探大队,郑州 450003
基金项目:国家地震局震害防御司资助的课题
摘    要:为了取得邢台地震区的地壳细结构,1990年冬,国家地震局地球物理研究所等实施了一条穿过华北平原中部束鹿断陷盆地的深地震反射剖面.经过叠加和偏移后的剖面显示出清晰的地壳细结构图像.剖面图上1-4s之间的强反射对应于由一组正断层产生的沉积层变形,其中新河断裂为束鹿盆地和新河凸起之间的边界主断裂,它伸展到8km以下深处.在5s左右显示出一组较强的反射界面,它可能对应于脆性上地壳的下界面.10-11s之间的壳-幔过渡带包含一组振幅大、连续性好的强反射,在震源下方的Moho界面上似乎被间断.岩浆从上地幔顶部侵入到地壳中,使得地壳可能出现部分熔融,这一过程是产生扩张盆地和发生邢台地震的主要原因.

关 键 词:深地震反射  CDP叠加剖面  铲形断层  壳-幔过渡带  邢台地震区  
收稿时间:1992-09-10

A STUDY ON FINE CRUSTAL STRUCTURE IN XINGTAI EARTHQUAKE AREA BASED ON DEEP SEISMIC REFLECTION PROFILING
WANG CHUN YONG WANG GUI-MEI LIN ZHONG-YANG ZHANG SI-WEILIU YUN-SHENG MAO TONG-EN LIU YUAN-SHENG DUAN YI-WEI Institute of Geophysics,State Seismological Bureau,Beijing .College of Seismic Techniques,Sanhe,Hebei .Seisraological Bureau of Jiangsu Province,Nanjing .Seismological Bureau of Shandong Province,Jinan .Geophysical Prospecting Brigade,State Seismological Bureau,Zhenzhou ..A STUDY ON FINE CRUSTAL STRUCTURE IN XINGTAI EARTHQUAKE AREA BASED ON DEEP SEISMIC REFLECTION PROFILING[J].Chinese Journal of Geophysics,1993,36(4):445-452.
Authors:WANG CHUN YONG WANG GUI-MEI LIN ZHONG-YANG ZHANG SI-WEILIU YUN-SHENG MAO TONG-EN LIU YUAN-SHENG DUAN YI-WEI Institute of Geophysics  State Seismological Bureau  Beijing College of Seismic Techniques  Sanhe  Hebei Seisraological Bureau of Jiangsu Province  Nanjing Seismological Bureau of Shandong Province  Jinan Geophysical Prospecting Brigade  State Seismological Bureau  Zhenzhou
Institution:1. Institute of Geophysics, State Seismological Bureau, Beijing 100081; 2. College of Seismic Techniques, Sanhe, Hebei 101601; 3. Seisraological Bureau of Jiangsu Province, Nanjing 210014; 4. Seismological Bureau of Shandong Province, Jinan 250021; 5. Geophysical Prospecting Brigade, State Seismological Bureau, Zhenzhou 450003
Abstract:Xingtai earthquakes of 1966 are located in the Shulu fault basin and its neighbor in the central region of North China Plain. In order to reveal the fine crustal structure in the earthquake area, a deep seismic reflection profile passed through the fault basin was conducted in the winter of 1990. The seismic section after stacking and migrating shows clearly the image of the fine crustal structure. On the section, strong reflections in 1-4 s TWT correspond to the deformation of sedimentary layers produced by a set of normal faults, where Xinghe fault is the main boundary fault between Shulu basin and Xinghe uplift, and extends to 8 km deep. The reflections at about 5 s may be correlated to the lower boundary of the brittle upper crust. The crust-mantle transition in 10-11 s contains a set of strong reflections with high amplitude and well continuity. However, it seems to be discontinuous beneath the hypocenter. The injection of magma from uppermost mantle to crust and partial melting of the lower crust may occur in this zone. This process may produce the extensional basin and the strong earthquakes.
Keywords:Deep seismic reflection  CDP stacking profile  listric fault  Crust-mantletransition  Xingtai earthquake area  
本文献已被 CNKI 维普 等数据库收录!
点击此处可从《地球物理学报》浏览原始摘要信息
点击此处可从《地球物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号