热带海洋学报 ›› 2009, Vol. 28 ›› Issue (6): 61-67.doi: 10.11978/j.issn.1009-5470.2009.06.061

• 海洋地球物理学 • 上一篇    下一篇

利用海底地震仪数据分析台风对海底环境噪音的影响

敖威1, 2, 赵明辉1, 阮爱国3, 丘学林1   

  1. 1.中国科学院边缘海地质重点实验室, 中国科学院南海海洋研究所, 广东 广州 510301;2. 中国科学院研究生院, 北京 100049; 3. 国家海洋局第二海洋研究所, 浙江 杭州 310012
  • 收稿日期:2008-09-04 修回日期:2008-11-22 出版日期:2009-12-30 发布日期:2009-12-12
  • 作者简介:敖威(1985—),男,湖北潜江人,在读硕士,主要从事海洋深部地球物理方向的研究工作。
  • 基金资助:

    科技部973项目(2007CB411701);国家自然科学基金(40776025);广东省自然科学基金(07004190);广东省科技计划项目(2006B37201007);国家海洋局海底科学重点实验室基金(klsg2007-03)

The impaction of typhoon on seafloor ambient noise by analyzing the OBS recording data

AO Wei1, 2 ZHAO Ming-hui1, RUAN Ai-guo3, QIU Xue-lin1   

  1. 1. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, CAS, Guangzhou 510301, China;2. Graduate University of CAS, Beijing 100049, China;3. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China
  • Received:2008-09-04 Revised:2008-11-22 Online:2009-12-30 Published:2009-12-12
  • About author:敖威(1985—),男,湖北潜江人,在读硕士,主要从事海洋深部地球物理方向的研究工作。
  • Supported by:

    科技部973项目(2007CB411701);国家自然科学基金(40776025);广东省自然科学基金(07004190);广东省科技计划项目(2006B37201007);国家海洋局海底科学重点实验室基金(klsg2007-03)

摘要:

在海底布设的海底地震仪(OBS)能比较清晰地记录到海底的环境噪音,而台风可以直接或间接的产生在海底传播的弹性波,从而影响海底的环境噪音,并在较大程度上影响OBS的数据记录。本文通过分析台风对工作区的整个影响过程中OBS记录数据的振幅变化,再选择合适的滤波方式,首次发现台风产生的风浪及涌浪在短周期海底地震仪的记录数据上有良好的表现特征,指出了台风对海底环境噪音的另一种可能的影响方式,并由此得出:1)台风产生的风浪和涌浪对海底环境噪音的影响模式不同;2)风浪和涌浪所加强的海底环境噪音的范围和程度不同;3)短周期OBS可以比较清晰的记录涌浪信息,其周期主要是6—8 s,且能量稳定(简称“8秒现象”)。这三点结论为后期的海洋地震研究和海洋学其他研究提供经验与借鉴。

关键词: 台风, 海洋环境噪音, 海底地震仪, 涌浪, 8秒现象

Abstract:

Ocean Bottom Seismometer (OBS) deployed in the seafloor can record information of ocean ambient noise, and typhoon can generate elastic waves propagating through the seafloor directly or indirectly. These factors cause great changes on OBS recording data to some extent. The OBS data during the process of typhoon was analyzed, and the methods of optimum filter were used in order to separate signals. After those work, we found that wind wave and ground swell were well recorded by short-period OBSs for the first time, and a new mode which typhoon affected seafloor ambient noise was put forward. We get three preliminary conclusions from above analysis: (1) Wind wave and ground swell caused by typhoon have their own distinctive modes to affect seafloor ambient noise;(2)The range and extent of seafloor ambient noise are obviously different which have been strengthened by two above waves;(3)Short-period OBSs can clearly record the information of ground swell, whose dominating period is 6—8 seconds and its energy is generally steady (we call it “8-second phenomenon); These results will have great significance for the future research on marine seismology and other aspects of oceanography.

Key words: typhoon, ocean ambient noise, OBS, ground swell, 8-second phenomenon