| 穿越南沙礼乐滩的海底地震仪广角地震试验 |
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| 引用本文： | 阮爱国,牛雄伟,丘学林,李家彪,吴振利,赵明辉,卫小冬.穿越南沙礼乐滩的海底地震仪广角地震试验[J].地球物理学报,2011,54(12):3139-3149. |
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| 作者姓名： | 阮爱国 牛雄伟 丘学林 李家彪 吴振利 赵明辉 卫小冬 |
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| 作者单位： | 1. 国家海洋局第二海洋研究所,杭州 310012;
2. 浙江大学地球科学系,杭州 310027;
3. 中国科学院南海海洋研究所,广州 510301 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 本文对穿越礼乐滩东北部向西北方向延伸进入中央海盆长369 km的广角地震剖面OBS973-2进行了反演研究,以期了解南海南部陆缘的地壳结构,同时探讨南、北陆缘的共轭问题.结果表明OBS973-2剖面的速度模型中三个沉积层的速度分别为1.8～2.0 km/s、2.0～2.7 km/s和3.5～4.0 km/s;沿剖面沉积...
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| 关 键 词： | OBS广角地震剖面 地壳结构 南海礼乐滩 共轭边缘 |
| 收稿时间： | 2011-06-15 |
A wide angle Ocean Bottom Seismometer profile across Liyue Bank,the southern margin of South China Sea |
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| RUAN Ai Guo
,
NIU Xiong-Wei
,
QIU Xue-Lin
,
LI Jia-Biao
,
WU Zhen-Li
,
ZHAO Ming-Hui
,
WEI Xiao-Dong.A wide angle Ocean Bottom Seismometer profile across Liyue Bank,the southern margin of South China Sea[J].Chinese Journal of Geophysics,2011,54(12):3139-3149. |
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| Authors: | RUAN Ai Guo NIU Xiong-Wei QIU Xue-Lin LI Jia-Biao WU Zhen-Li ZHAO Ming-Hui WEI Xiao-Dong |
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| Institution: | 1. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;
2. Department of Earth Sciences, ZheJiang University, Hangzhou 310027, China;
3. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | The wide angle seismic profile OBS973-2 that extends 369 km in NW-SE direction from the northeastern Liyue Bank to the central sub-basin is established by trial-and-error 2D ray-tracing method. This profile is compared with that in the northern continental margin for discussing the conjugation relationship between the northern margin and the southern margin. The velocity model consists of seven layers, i.e. water layer three sediment layers, upper crust, lower crust and upper mantle .The velocities of the three sediment layers are 1.8~2.0 km/s, 2.0~2.7 km/s and 3.5~4.0 km/s respectively. The sediment layers are thin in general and absent in some parts. There are some small volcanoes on the top of the crust in Liyue Bank and P wave velocities downward increase from 5.5~6.4 km/s in the upper crust (9~10 km thick) to 6.6~7.1 km/s in the lower crust (11 km thick). In the transition zone and sea basin P wave velocities downward increase from 5.9~6.1 km/s in the upper curst (4~5 km thick) to 6.6~6.9 km/s in the lower crust (2~4 km thick). The crust in the transition zone and sea basin shows some tectonic effect of stretching and thinning. The velocity structure of the model indicates that its continental crust is a standard one but its oceanic upper crust has relatively higher velocity than standard one. The seaward rising depth of Moho is 23 km in Liyue Bank and 8~12 km in the sea basin. The velocity beneath Moho is 8.0 km/s in sea basin, obviously smaller than 8.2 km/s in Liyue Bank. The comparison of profile OBS973-2 with a previous profile OBS2006-1 in the northern margin shows the remarkable similarity between them. This result and detailed discussion suggests a possibility of conjugation relationship between Liyue Bank and Zhongsha Massif, separated by the central seamount chain of the South China Sea. Furthermore, we calculate the seafloor spreading rate of the northwestern sub-basin and the southwestern sub-basin. |
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| Keywords: | Wide angle seismic profile of OBS Crustal structure Liyue Bank of SCS Conjugate margins |
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