南沙地块海底地震仪转换横波震相识别最新进展*

doi:10.11978/2015025

Abstract

Abstract: Using converted shear-wave information recorded by Ocean Bottom Seismometer (OBS) can promote our understanding about lithology and physical properties of crustal rocks. Taking 18 OBS stations along Profile OBS973-1 of Nansha Block in the South China Sea (SCS) as examples, we illustrated the method of OBS converted shear-wave identification. First, noise reduction processing of three-component OBS seismic data was completed using a band-pass filter, Wiener filter and polarization filter. Then, we used energy scanning method to find out the polarization angle, and obtained the optimal radial component data by horizontal component rotation. The results showed that the angle obtained by energy scanning method was more accurate and reliable than the magnetic compass angle recorded by OBS. Finally, the types of converted shear-waves were determined through the comparisons of travel times, particle trajectory and velocity model trial between vertical component and radial component. The method was applied successfully to the experiment in Nansha Block of the SCS for Profile OBS973-1. A few converted shear-wave phase groups, such as PgSs, PnSc and PmS, were identified in 10 OBSs. These results not only provided solid foundation for shear-wave velocity structure, but also offered experience and reference for effective application and promotion of OBS-converted shear-wave in other areas in the future.

Key words: Ocean Bottom Seismometer (OBS), converted shear wave, filter, horizontal components rotation, Nansha Block

ZHANG Li, ZHAO Minghui, QIU Xuelin, WANG Qiang. Recent progress of converted shear-wave phase identification in Nansha Block using Ocean Bottom Seismometers data[J].Journal of Tropical Oceanography, 2016, 35(1): 61-71.

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Recent progress of converted shear-wave phase identification in Nansha Block using Ocean Bottom Seismometers data

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