西南印度洋洋中脊热液A区海底地震仪数据处理初步成果*

doi:10.11978/j.issn.1009-5470.2012.03.011

Abstract

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

CLC Number:

P738

ZHANG Jia-zheng, ZHAO Ming-hui, QIU Xue-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.

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

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