热带海洋学报 ›› 2012, Vol. 31 ›› Issue (3): 35-39.doi: 10.11978/j.issn.1009-5470.2012.03.005cstr: 32234.14.j.issn.1009-5470.2012.03.005

• 海洋地球物理学 • 上一篇    下一篇

南海西南次海盆广角地震探测*

吴振利1, 阮爱国1, 李家彪1 , 李昭兴2, 丘学林3, 丁巍伟1   

  1. 1.国家海洋局 第二海洋研究所, 国家海洋局 海底科学重点实验室, 浙江 杭州 310012;2. 台湾海洋大学应用地球物理研究所, 台湾 基隆 20224; 3. 中国科学院南海海洋研究所, 广东 广州 510301
  • 收稿日期:2011-11-02 修回日期:2012-03-29 出版日期:2012-09-11 发布日期:2012-09-11
  • 作者简介:吴振利(1977—), 男, 河北省唐山市人, 博士, 副研究员, 主要从事边缘海构造方面的研究。E-mail: zhenli318@vip. sina.com。
    * 赵明辉副研究员在项目准备和执行过程中给予了有力支持, 朱俊江副研究员, 董崇志助研, 卫小冬博士, 黄海波博士, 梁进维助研, 牛雄伟博士, 潘少军硕士, 张洁硕士及科调队全体人员在地震数据获取和处理工作中分别给予了支持和帮助, 诚挚感谢!
  • 基金资助:

    国家自然科学基金资助项目(91028006, 41106053, 41176046); 中国科学院边缘海地质重点实验室资助项目(MSGL09-07); 国家海洋局第二海洋研究所基本科研业务费专项资助项目(JT201101)

Wide-angle seismic exploration in the southwest sub-basin of the South China Sea

WU Zhen-li1, RUAN Ai-guo1, LI Jia-biao1, LEE Chao-shing2, QIU Xue-lin3, DING Wei-wei1   

  1. 1. Second Institute of Oceanography, Laboratory of Submarine Geosciences, State Oceanic Administrtion, Hangzhou 310012, China; 2. Institute of Applied Geosciences National Taiwan Ocean University, Keelung 20224, China;3. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  • Received:2011-11-02 Revised:2012-03-29 Online:2012-09-11 Published:2012-09-11

摘要: 2010年12月—2011年3月在南海西南次海盆开展了海底地震仪(Ocean Bottom Seismometer, OBS)探测, 采用Sedis IV型、I-4C型和MicrOBS3种不同型号的OBS, 以4×24.5L的大容量气枪为震源, 获得了覆盖西南次海盆残留扩张脊的3D人工地震数据。从处理的地震数据可知, 此次试验是一次比较成功的地震实验, OBS地震记录清晰、震相丰富, 所使用的气枪有足够的能量输出, 显示了其良好的工作能力。选取剖面1中的7台OBS进行了2D剖面处理。初步建模结果表明, 南海西南次海盆地壳结构为普通洋壳, 海山顶部沉积层很薄, 莫霍面埋深较浅。

关键词: 海底地震仪, 广角地震, 南海, 西南次海盆, 海底扩张

Abstract: During December 2010 and March 2011, Ocean Bottom Seismometer (OBS) experiment was carried out in the southwest sub-basin of the South China Sea (SWSB). Three types of OBS, Sedis IV type, I-4C type and MicrOBS type, were used in the experiment, and the energy source was supplied by 4?24.5L large volume air-gun. High quality seismic data that covered the extinct mid ocean ridge of the SWSB were acquired. The data could provide evidence for oceanic crust structure of the SWSB and seafloor spreading course, among others. The data of the seven stations of Profile 1 have been processed, which shows that the seismic records are clear and seismic phases are abundance and that the air-guns had enough energy supplies. Seismic phase analysis and first arrival tomography indicate that the crust of the SWSB is normal oceanic crust with a thin sedimentary layer on the seamount and shallow moho, which provides a good foundation for future research.

Key words: OBS, wide-angle seismic, southwest sub-basin of the South China Sea, seafloor spreading

中图分类号: 

  • P738.4