The regional disaster investigation of Dadu River of Luding earthquake and feasibility study of Green's function database application
Huang Ting
Li Zongchao
Tang Fangtou
Sun Jize
Fu Changhua
Wang Xiaohui
Ji Zhiwei
Gao Mengtan
Ye Kun
Abstract：On September 5,2022,an MS6.8 earthquake occurred in Luding County,Ganzi Prefecture,Sichuan Province,China,causing extensive damage.The scientific expedition team of the Institute of Geophysics of the China Earthquake Administration investigated the damage caused by the earthquake in several terrace hydropower stations on the main stream of the Dadu River and nearby areas.It was determined that the cascade power stations ware less affected by the earthquake and that normal operation was not affected.Using the empirical Green's func-tion method and considering the uncertainty characteristics of the seismic source parameters,the ground motion ac-celeration time histories were estimated for a reasonable range of three typical locations in the seismic region:the Shimian Caluo area(termed location 1),the Xingkang Expressway bridge area in the Dadu River basin(termed loc-ation 2),and the area near the historical seismic ancient landslides(Mogangling,termed location 3).The prelimin-ary results showed that:buildings at locations 1 and 3 may be destroyed by an earthquake of this strength,whereas the bridges in location 2 are less likely to be destroyed.Here,combining the results of the disaster investigation,the seismic network built by the key engineering project,and the results of the rapid estimation of the ground motion at typical locations,we consider the feasibility of applying the Green's function library based on the waveforms of ac-tual small earthquakes in key project areas.
Keywords：Luding MS6.8 earthquakedisaster investigationDadu River terrace hydropower stationsempiri-cal Green's function databaseground motion simulation
Publication Date：2024-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 440-452 )