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Journal of Tropical Oceanography >

2012 , Vol. 31 >Issue 3: 79 - 89

DOI: https://doi.org/10.11978/j.issn.1009-5470.2012.03.011

Marine geomorphology

OBS seismic data processing and preliminary results on the hydrothermal field of the Southwest Indian Ridge

  • ZHANG Jia-Zheng ,
  • DIAO Meng-Hui ,
  • QIU Hua-Lin ,
  • Ruan-Ai-Guo ,
  • LI Jia-Biao ,
  • CHEN Yong-Shun ,
  • AO Wei ,
  • WEI Xiao-Dong
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  • 1. Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
    2. Second Institute of Oceanography, SOA, Hangzhou 310012, China;
    3. Computational Geodynamics Laboratory, Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    4. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2011-10-25

  Revised date: 2011-12-26

  Online published: 2012-09-11

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Abstract

Three-dimensional (3D) ocean bottom seismometer (OBS) survey provides a significant foundation for the deep crustal and upper mantle structure of the hydrothermal field (49°39′E) (Area A) in the Southwest Indian Ridge. OBS data processing is the basic step of obtaining the 3D seismic velocity structure. The flow steps for data processing of three types of OBS (domestic, French and Germanic OBS) were firstly introduced, containing the decompilation, cutting and seismic signal visualization. Taking the shot 2790th for example, waveforms and frequency spectrums of three types of OBSs were then analyzed, which were related to frequency band, sensor and seismograph for different OBSs. Domestic and French OBSs recorded long-periodic and short-periodic noises, and Germanic OBS only recorded short-periodic noises. However, air-gun signals were highlighted and noises were suppressed for all the OBSs after using a band-passed filter. Moreover, several seismic phases, e.g., Pg, PmP and Pn, were clearly revealed in the recorded seismic sections of three types of OBSs (OBS04, OBS08 and OBS23) along the profile X1X2. These phases will provide a strong data base for 3D tomography for studying Area A.

Key words： ocean bottom seismometer (OBS); waveform character; frequency spectrum analysis; seismic phase; Southwest Indian Ridge

Cite this article

ZHANG Jia-Zheng , DIAO Meng-Hui , QIU Hua-Lin , Ruan-Ai-Guo , LI Jia-Biao , CHEN Yong-Shun , AO Wei , WEI Xiao-Dong . OBS seismic data processing and preliminary results on the hydrothermal field of the Southwest Indian Ridge[J]. Journal of Tropical Oceanography, 2012 , 31(3) : 79 -89 . DOI: 10.11978/j.issn.1009-5470.2012.03.011

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