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Surface Wave Group Velocity Tomography Imaging from Ambient Noise for Fujian Province and Its Adjacent Areas
ZHANG Lina,LUO Yan,CHEN Zhiyong,XIE Zhizhao,ZHOU Lanjie,ZENG Xiangfang
Author NameAffiliationE-mail
ZHANG Lina Xiamen Seismic Survey Research Center, Fujian Earthquake Agency, Xiamen 361021, Fujian, China zengxf@whigg.ac.cn 
LUO Yan Institute of Earthquake Forecasting, CEA, Beijing 100036, China  
CHEN Zhiyong Fujian Earthquake Agency, Fuzhou 350003, China  
XIE Zhizhao Xiamen Seismic Survey Research Center, Fujian Earthquake Agency, Xiamen 361021, Fujian, China  
ZHOU Lanjie Xiamen Seismic Survey Research Center, Fujian Earthquake Agency, Xiamen 361021, Fujian, China  
ZENG Xiangfang State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China  
摘要:
Two-month continuous waveforms of 108 broadband seismic stations in Fujian Province and its adjacent areas are used to compute noise cross-correlation function (NCF). The signal quality of NCF is improved via the application of time-frequency phase weighted stacking. The Rayleigh and Love waves group velocities between 1s-20s are measured on the symmetrical component of the NCF with the multiple filter method. More than 5,000 Rayleigh wave dispersion curves and about 4,000 Love wave dispersion curves are obtained and used to invert for group velocity maps. This data set provides about 50km resolution that is demonstrated with checkerboard tests. Considering the off great circle effect in inhomogeneous medium, the ray path is traced based on the travel time field computed with a finite difference method. The inverted group velocity maps show good correlation with the geological features in the upper and middle crust. The Fuzhou basin and Zhangzhou basin showed low velocity on the short period group velocity maps. On the long period group velocity maps, the low velocity anomaly in the high heat flow region near Zhangzhou and clear velocity contrast across the Zhenghe-Dapu faults, which suggests that the Zhenghe-Dapu fault might be a deep fault.
关键词:  Fujian  Ambient noise  Surface wave group velocity  Tomography imaging
DOI:10.19743/j.cnki.0891-4176.201901015
分类号:
基金项目:This project was sponsored by the Youth Foundation of Fujian Earthquake Agency (Y201710) and the Basic Research Fund of the Institute of Earthquake Forecasting,China Earthquake Administration (2015IES010302).
Surface Wave Group Velocity Tomography Imaging from Ambient Noise for Fujian Province and Its Adjacent Areas
ZHANG Lina,LUO Yan,CHEN Zhiyong,XIE Zhizhao,ZHOU Lanjie,ZENG Xiangfang
Abstract:
Two-month continuous waveforms of 108 broadband seismic stations in Fujian Province and its adjacent areas are used to compute noise cross-correlation function (NCF). The signal quality of NCF is improved via the application of time-frequency phase weighted stacking. The Rayleigh and Love waves group velocities between 1s-20s are measured on the symmetrical component of the NCF with the multiple filter method. More than 5,000 Rayleigh wave dispersion curves and about 4,000 Love wave dispersion curves are obtained and used to invert for group velocity maps. This data set provides about 50km resolution that is demonstrated with checkerboard tests. Considering the off great circle effect in inhomogeneous medium, the ray path is traced based on the travel time field computed with a finite difference method. The inverted group velocity maps show good correlation with the geological features in the upper and middle crust. The Fuzhou basin and Zhangzhou basin showed low velocity on the short period group velocity maps. On the long period group velocity maps, the low velocity anomaly in the high heat flow region near Zhangzhou and clear velocity contrast across the Zhenghe-Dapu faults, which suggests that the Zhenghe-Dapu fault might be a deep fault.
Key words:  Fujian  Ambient noise  Surface wave group velocity  Tomography imaging