Site classification for offshore ground motion S-net stations based on spectral ratio method

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 90-101.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Site classification for offshore ground motion S-net stations based on spectral ratio method

WANG Shi1,2, WANG Xiang*1,2, HU Lei3, ZHOU Xutong4

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Abstract

The site information of offshore stations is usually difficult to obtain, and the engineering characteristics of marine sites are the important basis for the design, construction, operation and maintenance of major marine projects, as well as an important parameter for the study of site amplification in marine ground motion. To solve this problem, H/V spectral ratio curves of buried and unburied stations are obtained based on strong ground motion data from 150 stations of the S-net station network in the Japan Trench region and site classification is performed in this study. The results show that the offshore H/V spectral ratio curve has a large spectral ratio value. The H/V spectral ratio curves of each site category for buried and unburied stations differ dramatically in spectral ratio values and spectral ratio shapes. The magnitude and epicentral distance have a large effect on the long-periods H/V spectral ratio curves, and the focal depth has barely any effect on the H/V spectral ratio curves. The research results may provide references for the simulation of offshore ground motion, the study of site effects and the construction of marine engineering.

Key words

offshore ground motion / spectral ratio method / marine site / site classification / S-net

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WANG Shi1, 2, WANG Xiang1, 2, HU Lei3, ZHOU Xutong4. Site classification for offshore ground motion S-net stations based on spectral ratio method[J]. Journal of Vibration and Shock, 2025, 44(1): 90-101

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