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Tomography for Q of the Eastern Section of the Tianshan Area from High-frequency Attenuation of S-wave
Li Jin,Zhou Longquan,Wang Huilin,Xiang Yuan
作者单位E-mail
Li Jin Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 830011, China  
Zhou Longquan China Earthquake Networks Center, Beijing 100045, China lqzhou@seis.ac.cn 
Wang Huilin Hainan Earthquake Agency, Haikou 570203, China  
Xiang Yuan Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 830011, China  
摘要:
Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital Seismic Network, a data set of 19,140 attenuation factors t* is obtained by fitting the high-frequency attenuation of S-wave spectra with a genetic algorithm. The spatial distribution of QS is determined by inverting the t* data with seismic tomography. The results show that the average Q0 in eastern Tianshan is 520, and there is a significant correlation between the QS value distribution or attenuation characteristics it disclosed and the surface structure of the study area. The QS value is lower in the intersection area of the mountain basin which is located on the north and south sides of the Tianshan Mountains, and the high QS distribution is more concentrated inside the Tianshan orogenic belt. The M ≥ 6.0 earthquakes have been basically located in the Low-QS region since 1900. 24 high heat flow points in eastern Tianshan are located at the north and south of Tianshan Mountains where low QS exists, indicating a negative correlation. In addition, there is a positive correlation between the velocity structure and the attenuation structure in the study area, which reflects the consistency of the 2-D attenuation structure with the velocity structure and the two-dimensional density structure.
关键词:  Eastern section of the Tianshan area  High-frequency attenuation of S-wave  Attenuation operator t*  Q tomography
DOI:
分类号:
基金项目:This project was jointly funded by the Contract Oriented Work Task for Seismic Situation in 2017(2017010104), Science for Earthquake Resilience (XH17041Y) and Fund of Earthquake Agency of Xinjiang Uygur Autonomous Region (201401).
Tomography for Q of the Eastern Section of the Tianshan Area from High-frequency Attenuation of S-wave
Li Jin,Zhou Longquan,Wang Huilin,Xiang Yuan
Abstract:
Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital Seismic Network, a data set of 19,140 attenuation factors t* is obtained by fitting the high-frequency attenuation of S-wave spectra with a genetic algorithm. The spatial distribution of QS is determined by inverting the t* data with seismic tomography. The results show that the average Q0 in eastern Tianshan is 520, and there is a significant correlation between the QS value distribution or attenuation characteristics it disclosed and the surface structure of the study area. The QS value is lower in the intersection area of the mountain basin which is located on the north and south sides of the Tianshan Mountains, and the high QS distribution is more concentrated inside the Tianshan orogenic belt. The M ≥ 6.0 earthquakes have been basically located in the Low-QS region since 1900. 24 high heat flow points in eastern Tianshan are located at the north and south of Tianshan Mountains where low QS exists, indicating a negative correlation. In addition, there is a positive correlation between the velocity structure and the attenuation structure in the study area, which reflects the consistency of the 2-D attenuation structure with the velocity structure and the two-dimensional density structure.
Key words:  Eastern section of the Tianshan area  High-frequency attenuation of S-wave  Attenuation operator t*  Q tomography