| HAO Tianyao,YOU Qingyu,LIU Lihua,LV Chuanchuan,XU Ya,LI Zhiwei,ZHAO Chunlei,ZHENG Yanpeng,LIU Chenguang,HAN Guozhong. 2013. Joint land-sea seismic survey and research on the deep structures of the Bohai Sea areas. Acta Oceanologica Sinica, 32(12):13－24 |
| Joint land-sea seismic survey and research on the deep structures of the Bohai Sea areas |
| Joint land-sea seismic survey and research on the deep structures of the Bohai Sea areas |
| Received:May 10, 2013 Revised:August 05, 2013 |
| DOI：10.1007/s13131-013-0383-4 |
| Key words:seismic survey profiles velocity anomaly crustal structure lithospheric thinning Bohai Sea |
| 中文关键词: seismic survey profiles velocity anomaly crustal structure lithospheric thinning Bohai Sea |
| 基金项目:Expedition and Assessment of Environment in the Polar Area under contract Nos CHINARE 2012-03-03 and 2013-04-03; the Polar Strategic Research Foundation under contract No. 20100210; Public Science and Technology Research Funds Projects of Ocean under contract No. 200905024-3. |
| Author Name | Affiliation | E-mail | | HAO Tianyao | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China | tyhao@mail.iggcas.ac.cn | | YOU Qingyu | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China | | | LIU Lihua | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China | | | LV Chuanchuan | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China | | | XU Ya | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China | | | LI Zhiwei | Wuhan Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China | | | ZHAO Chunlei | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China | | | ZHENG Yanpeng | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LIU Chenguang | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | HAN Guozhong | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
|
| Hits: 1934 |
| Download times: 1879 |
| Abstract: |
| This paper presents the survey and research work of two land-sea profiles in the Bohai Sea, China, carried out in 2010-2011, including the seismic sources on land and in the sea, the ocean bottom seismographs (OBS) and their recovery, the coupling of OBS and the environment noise in sea area, the data quality of OBSs, and the result of data analysis. We focused on the investigation of crustal structures revealed by the two NE\EW-trending joint land-sea profiles. In combination with the Pn-velocity distribution and gravity-magnetic inversion results in the North China Craton, we propose that the undulation of the Moho interface in the Bohai and surrounding areas is not strong, and the lithospheric thinning is mainly caused by the thinning of its mantle part. The research result indicates that obvious lateral variations of Moho depth and seismic velocity appear nearby all the large-scale faults in Bohai Sea, and there is evidence of underplating and reforming of the lower crust by mantle material in the Bohai area. However, geophysical evidence does not appear to support the "mantle plume" or "delamination" model for the North China Craton destruction. The crustal structure of the Bohai Sea revealed "a relatively normal crust and obviously thinned mantle lid", local velocity anomalies and instability phenomena in the crust. These features may represent a combined effect of North China-Yangtze collision at an early stage and the remote action of Pacific plate subduction at a late stage. |
| 中文摘要: |
| This paper presents the survey and research work of two land-sea profiles in the Bohai Sea, China, carried out in 2010-2011, including the seismic sources on land and in the sea, the ocean bottom seismographs (OBS) and their recovery, the coupling of OBS and the environment noise in sea area, the data quality of OBSs, and the result of data analysis. We focused on the investigation of crustal structures revealed by the two NE\EW-trending joint land-sea profiles. In combination with the Pn-velocity distribution and gravity-magnetic inversion results in the North China Craton, we propose that the undulation of the Moho interface in the Bohai and surrounding areas is not strong, and the lithospheric thinning is mainly caused by the thinning of its mantle part. The research result indicates that obvious lateral variations of Moho depth and seismic velocity appear nearby all the large-scale faults in Bohai Sea, and there is evidence of underplating and reforming of the lower crust by mantle material in the Bohai area. However, geophysical evidence does not appear to support the "mantle plume" or "delamination" model for the North China Craton destruction. The crustal structure of the Bohai Sea revealed "a relatively normal crust and obviously thinned mantle lid", local velocity anomalies and instability phenomena in the crust. These features may represent a combined effect of North China-Yangtze collision at an early stage and the remote action of Pacific plate subduction at a late stage. |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
