• 责任者：He Zhengqin (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Hu Gang
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(11)
• 关键词：浅层地震勘探 ; shallow seismic exploration ; 速度结构 ; velocity structure ; 云南 ; Yunnan Province
• 页码：p.3819-3827
• 图表：6 illus., 15 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     In order to study the site effect on the ground motion in Tonghai basin, the model with shallow layer velocity structure must be provided for the simulation of strong ground motion. To this end, reflection surveys with high resolution along 10 km profile combined with the surface wave exploration at 30 observations are carried out in Tonghai basin. Integrating the existing data from borehole and electrical sounding performed before for lignite prospecting, the depth distribution of the bedrock is figured out by analyzing the measured data. Results show that the thickness of Cenozoic is 100~300 m in the centre of the basin and exhibit an overall trend of thick in southwest and thin in northeast. The variation of the sediment thickness is apparently controlled by the branch fault in the south of Xiaojiang fault. The shallow layer velocity at the edge of the basin is larger than that in the centre for the same depth.