Amplification Effects of Soil Sites on Ground Motion in the Weihe Basin

详细信息   

• 责任者：Wang Haiyun (Institute of Engineering Mechanics ; China Earthquake Administration ; Harbin 150080 ; China)
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(1)
• 关键词：场地勘查 ; site exploration ; 抗震设计 ; aseismic design ; 渭河盆地 ; Weihe Basin
• 页码：p.137-150
• 图表：8 illus., 2 tables, 30 refs.
• 分类号：1702
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

 Effects of soil sites on ground motion are relatively serious, their amplification effects on ground motion must be considered in site selection and seismic fortification of buildings to prevent or mitigate seismic hazard of buildings. The mainshock’s acceleration time histories of 27 stations (including 2 bedrock stations and 25 soil stations) in the digital strong motion seismograph network installed in the Weihe basin in Wenchuan great earthquake were recorded. The results are as follows: 1) peak ground accelerations (PGAs) on the soil sites in the Weihe basin in the Wenchuan great earthquake have decreasing trends with the epicentral distances regardless of the soil thickness; 2) according to the characteristics of both acceleration response spectra of soil sites and amplification effects of soil sites on ground motions in the Weihe basin in the Wenchuan great earthquake, the soil sites in Weihe Basin can be classified into 3 categories; 3) the amplification effects of soil sites on different direction (i.e. EW, NS and UD) ground motions in the Weihe basin in the Wenchuan great earthquake are different. Generally, EW>NS>UD; and 4) abnormal area of intensity Ⅶ along basin edge from Baoji to Meixian in the Weihe basin in the Wenchuan great earthquake resulted from combined amplification effects of both soil sites and basin edge effects on ground motions.