Application of the Double-difference Relocation Method Combined with Waveform Cross-correlation on the Three Gorges Reservoir Seismicity

作     者：Luo Jiahong Ma Wentao Li Chunzheng 

作者机构：Key Laboratory of Active Tectonics and VolcanoInstitute of GeologyCEABeijing 100029China 

出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)

年 卷 期：2017年第31卷第3期

页      面：368-380页

核心收录：

学科分类：081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 

基　　金：funded by the National Science and Technology Pillar Program(2008BAC38B04) the Special Research Fund for Seismology(16A44ZX282) 

主　　题：Bi-spectrum verification Waveform cross-correlation Double-difference location The Three Gorges Reservoir 

摘      要：In this paper,we use the double difference location method based on waveform crosscorrelation algorithm for precise positioning of the Three Gorges Reservoir( TGR)earthquakes and analysis of seismic activity. First,we use the bi-spectrum cross-correlation method to analyze the seismic waveform data of TGR encrypted networks from March,2009 to December,2010,and evaluate the quality of waveform cross-correlation analysis.Combined with the waveform cross-correlation of data obtained, we use the double difference method to relocate the earthquake position. The results show that location precision using bi-spectrum verified waveform cross-correlation data is higher than that by using other types of data,and the mean 2 sig-error in EW,NS and UD are 3.2 m,3.9 m and 6.2 m,respectively. For the relocation of the Three Gorges Reservoir earthquakes,the results show that the micro-earthquakes along the Shenlongxi river in the Badong reservoir area obviously show the characteristics of three linear zones with nearly east-west direction,which is in accordance with the small faults and carbonate strata line of the neotectonic period,revealing the reservoir water main along the underground rivers or caves permeated and induced seismic activity. The stronger earthquakes may have resulted from small earthquakes through the active layers.