海底地震仪实测信号特性分析*

doi:10.11978/j.issn.1009-5470.2012.03.012

Abstract

Abstract: Seismic signals of ocean bottom seismometer (OBS) on the seafloor hundreds or thousands meters deep are different from those of land seismometer. The records of short-period OBS are also obviously different from those of broad-band OBS due to effects of sea water or signal frequency. This study carried out time-frequency analysis and compared the seismic signals excited by air gun as well as earthquake signals of OBS during a seismic survey in the southwest sub-basin of the South China Sea. The results are as follows. 1) Air-gun shooting generated two kinds of noises: one is long-wave noise due to the superposition of water fluctuation, with a period of 50s mainly in the horizontal component; the other is high-frequency noise, mainly due to fin vibration of OBS pedestal itself. 2) Broad-band OBS is able to detect the fluctuation caused by moving object under water, especially in the horizontal component whose amplitude is large and whose frequency feature is clear, from which the direction of the signal source can be distinguished. 3) During this survey broad-band OBS recorded many high-quality earthquakes that will benefit our study on the lithosphere structure of the survey area, while short-period OBS had also obtained direct P-wave arrivals clearly. The I-4C type OBS happened to record the catastrophe earthquake of M9.0 occurred near Japan in March 2011.

Key words: ocean bottom seismometer, OBS signals, short period, broad band

CLC Number:

P716.83

LIU Hong-yang, NIU Xiong-wei, RUAN Ai-guo, , WU Zhen-li, LI Jia-biao, , PAN Shao-jun. Analysis of seismic signals of ocean bottom seismometer[J].Journal of Tropical Oceanography, 2012, 31(3): 90-96.

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Analysis of seismic signals of ocean bottom seismometer

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