Horizontal ground-motion models for subduction interface earthquakes based on the offshore ground motion database of the S-net in the Japan Trench area

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (18) : 186-200.

TAN Jingyang1,2,YAN Shilong1,2,CHEN Denghong1,2,ZHANG Qi1,2,CHEN Liuzhuo1,2

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Abstract

The prediction model of ground-motion response spectrum is the basis of probabilistic seismic hazard analysis (PSHA). Based on the offshore subduction interface ground-motion database of the large ocean-bottom network S-net in subduction zone of the Japan Trench, the horizontal ground-motion model of the offshore interface earthquakes in the subduction zone is established in the present study, and the difference of offshore and onshore ground-motion models of interface earthquakes is analyzed. The prediction model takes into account the water depths and the sedimentary thickness of the ocean-bottom stations, both of which are associated with the site condition. Due to the different buried methods of the ocean-bottom stations, these stations are classified according to buried and unburied methods in the model. Based on regression analysis and parameter smoothing, we established a prediction model of the horizontal offshore interface ground motion, taking into account earthquake types, moment magnitude, and focal depth, rupture distance, water depth, and sedimentary thickness and buried method. By separating the within-event residuals, we presented the single-station standard deviation of the offshore interface prediction model in the offshore region, which can be used for PSHA of specific sites. The offshore model can be utilized as a reference for the seismic zoning of offshore region considering the source type and the PSHA of offshore region.

Key words

offshore ground motion / subduction interface earthquake / prediction model / random effect model / marine engineering

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TAN Jingyang1, 2, YAN Shilong1, 2, CHEN Denghong1, 2, ZHANG Qi1, 2, CHEN Liuzhuo1, 2. Horizontal ground-motion models for subduction interface earthquakes based on the offshore ground motion database of the S-net in the Japan Trench area[J]. Journal of Vibration and Shock, 2024, 43(18): 186-200

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