主动源海底地震仪横波模型的自动搜索与非唯一性分析*

doi:10.11978/2020153

Abstract

Abstract:

Active Ocean Bottom Seismometer (OBS) prospecting is taking the leading role in illuminating submarine structures, among which converted shear wave modeling provides precise constrains on seismic structures and lithology. Due to the tedious procedures involved, difficulties in reaching optimal solution and insufficiency in non-uniqueness analysis in the present modeling method, we propose a new modeling method based on model solution space and objective function. Automatic modeling of converted shear waves can be realized using this new method with the aid of computer programming. This method is tested for its utilities in a realistic wide-angle OBS seismic profile, OBS2013-3, traversing the Xisha block, the northwestern South China Sea continental margin. PPS phases from a single station and PSS phases from all stations are employed in the case to model V_p/V_s ratios in sediments and the crust, respectively, where V_p is compressional wave velocity and V_s is shear wave velocity. Capacities of the new method to provide quick and accurate search for optimal models and estimates for modeling non-uniqueness are demonstrated. The new method is expected to promote the efficiency of converted shear wave modeling using OBS data and lay solid foundation for reliability and stability of modeling results.

Key words: Ocean Bottom Seismometer (OBS), converted shear wave, modeling method, automatic search, non-uniqueness analysis

CLC Number:

P712.83

ZHANG Haoyu, QIU Xuelin, HUANG Haibo. Automatic search and non-uniqueness analysis of shear wave models from active Ocean Bottom Seismometer data[J].Journal of Tropical Oceanography, 2022, 41(1): 194-203.

Figures/Tables 8

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References 30

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Automatic search and non-uniqueness analysis of shear wave models from active Ocean Bottom Seismometer data

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