Abstract：In order to study the site amplification characteristics of submarine sites, 8199 acceleration recordings are selected from 6 offshore strong motion stations and 23 nearby onshore strong motion stations in 188 earthquakes in the Sagami Bay area of Japan. The consistency of seismic source displacement spectrum is studied by generalized inversion method. The characteristics of the attenuation function are analyzed by using the non-parametric generalized inversion method, which is not constrained by the traditional attenuation function. Finally, the site amplification of submarine station is separated. The subsurface structure is obviously different for the sea area and the land area of the Sagami Bay area. When the attenuation function of the sea area and the land area is assumed same in the decoupling process of source, propagation path and site conditions, the estimation precision of amplification of the submarine site will be influenced. The attenuation functions of the land and the sea area are both considered differently in the study of submarine site amplification. The results show that the quality factor of the sea area in the Sagami Bay area in Japan is very sensitive to the geometric attenuation model at high frequency and smaller than that on land. The attenuation rate of horizontal ground motion in sea area is higher than that in land area. It is also shown that the site amplification estimation accuracy of the submarine strong seismic station can be further improved by considering the attenuation characteristics of the sea area.
宋健 师黎静 党鹏飞 谭景阳. 考虑海域衰减特性的日本相模湾海底场地放大研究[J]. 土木工程学报, 2021, 54(12): 74-84.
Song Jian Shi Lijing Dang Pengfei Tan Jingyang. Study on site amplification of strong ground motion stations considering attenuation characteristics of the sea area in the Sagami Bay area, Japan. 土木工程学报, 2021, 54(12): 74-84.
