文献类型：期刊文献

英文题名：Study of 3-D velocity structure characteristics in Dadu river Houziyan reservoir area at different impoundment stages

作者：Yang, Zhenggang Cao, Junxing Wu, Yuchuan Qin, Juan Huang, Huibao Du, Xingzhong Yang, Mingxing Wu, Jianchao

第一作者：Yang, Zhenggang

通信作者：Cao, JX[1];Qin, J[2]

机构：[1]Chengdu Univ Technol, Coll Geophys, Chengdu, Peoples R China;[2]Power China Guiyang Survey Design & Res Inst Co Lt, Guiyang, Peoples R China;[3]Chongqing Earthquake Agcy, Chongqing, Peoples R China;[4]Guodian Dadu River Basin Hydropower Dev Co Ltd, Chengdu, Peoples R China;[5]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang, Peoples R China;[6]China Earthquake Adm, Inst Seismol, Hubei Key Lab Earthquake Early Warning, Wuhan, Peoples R China

第一机构：Chengdu Univ Technol, Coll Geophys, Chengdu, Peoples R China

通信机构：corresponding author), Chengdu Univ Technol, Coll Geophys, Chengdu, Peoples R China;corresponding author), Chongqing Earthquake Agcy, Chongqing, Peoples R China.

年份：2024

卷号：12

外文期刊名：FRONTIERS IN EARTH SCIENCE

收录：;Scopus(收录号：2-s2.0-85187166337);WOS:【SCI-EXPANDED(收录号:WOS:001180718100001)】；

基金：The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This research was sponsored by the Key Scientific Research Projects of the Power China Guiyang Survey Design and Research Institute Co., Ltd. (YJ2022-09; DJ-ZDXM-2020-55); Chongqing Technology Innovation and Application Development Project of Chongqing Science and Technology Bureau (CSTB2022TIAD-KPX0197); Guizhou Provincial Science and Technology Projects [QKHJC-ZK(2022)-General 186]. Projects of National Natural Science Foundation of China (No. 41602275 and 41977298); Provincial Key Disciplines of Guizhou Province-Geological Resources and Geological Engineering [ZDXK(2018)001].

语种：英文

外文关键词：reservoir impoundment; reservoir earthquake; seismic tomography; velocity structure; houziyan reservoir area

摘要：High-resolution three-dimensional VP, VS and VP/VS images in the Houziyan Reservoir Area were obtained by using Fast Marching Tomography Package (FMTOMO) with the travel time data from 6330 seismic events monitored by the Houziyan Reservoir Seismic Network. This analysis yielded the 3-D velocity structure, including longitudinal wave velocity (VP), shear wave velocity (VS), and the ratio of longitudinal and shear wave velocity (VP/VS) at different impoundment stages. The data changes at various impoundment times, depths of sections, and directions of profiles were analyzed to obtain these results. The final findings demonstrate the following results: 1) Through tomographic analysis, it was determined that the underground velocity structure in the Houziyan reservoir area was anisotropic before impoundment. 2) The area of high wave velocity increases in stage 1, stage 3, and stage 4. The area of low wave velocity increases in stage 2, especially in depth, indicating significant changes in the underground velocity structure at different impoundment stages. 3) Compared to the changes in underground velocity structures in other reservoirs after impoundment, the Houziyan reservoir exhibited a unique pattern. 4) In general, the underground velocity structure displayed an overall increasing trend after impoundment. However, it also exhibited instances of decreasing velocity, reflecting continuous dynamic adjustments to the underground velocity structure after impoundment. These conclusions highlight the impact of impoundment in the reservoir area on the underground velocity structure and provide scientific theoretical support for seismic risk assessment following impoundment in the reservoir area.