| Temporal and Spatial Images of Ambient Noise Intensity in the Chinese Mainland |
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| 作者姓名： | Zhou Lianqing Song Xiaodong Zhao Cuiping |
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| 作者单位： | Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, Beijing 100036, China;University of Illinois at Urbana-Champaign, Urbana IL 61801, USA;Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,University of Illinois at Urbana-Champaign, Urbana IL 61801, USA,Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, Beijing 100036, China |
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| 基金项目： | This project was jointly funded by the "Track Research on Strong Earthquake Risk along Southern Segment of the Longmenshan Fault Zone by Seismological Method (2014IES0100103)", and "Dynamic Stress Response of Typical Faults in Reservoir Area to Reservoir Filling and Water Level Variation(2015IES010305)", special projects of basic scientific research of Institute of Earthquake Science, China Earthquake Administration, and Joint Inversion of Crustal Upper Mantle Structure in the Taiwan Straits and Its Surrounding Area, Natural Science Foundation of China(NSFC4127405). |
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| 摘 要： | Successive waveforms of the vertical component recorded by 888 broadband seismic stations in the China Seismography Network from January,2010 to June,2011 are used to investigate the temporal and spatial distribution of ambient noise intensity,and the images of ambient noise intensity at the period of 10 s in the Chinese Mainland are obtained. The temporal variation of ambient noise intensity shows some seasonal and periodic characteristics. The maximum ambient noise intensity occurred from January,2011 to March,2011. The spatial distribution images of ambient noise intensity show obvious zoning features,which doesnt correlate with surface geology,suggesting that the noise field is stronger than the site factors. The strength in southeastern coastal areas reaches its maximum and generally decreases toward to inland areas,and arrives at the minimum in the Qinghai-Tibetan Plateau. The zonal intensity distribution is probably correlated with ocean tides from the Philippine Ocean and the Pacific Ocean. It also shows that the influence from the Indian Ocean seems small. However, the ambient noise intensity increases to a certain degree in the Xinjiang area,indicating that the main source of ambient noise in the western area of the Chinese Mainland is not derived from the East and South China Sea,but rather from the deep interior of the Eurasian continent. The ambient noise intensity obtained in this study can supply reference for seismology research based on ambient noise correlation. Moreover,it can supply basic data for attenuation research based on ambient noise, and thus help achieve the object of retrieving the attenuation of Rayleigh waves from ambient noise.
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| 关 键 词： | Ambient noise Noise source Amplitude of surface wave Attenuation |
| 收稿时间： | 2016/7/8 0:00:00 |
| 修稿时间： | 2016/10/8 0:00:00 |
Temporal and Spatial Images of Ambient Noise Intensity in the Chinese Mainland |
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| Zhou Lianqing,Song Xiaodong,Zhao Cuiping.Temporal and Spatial Images of Ambient Noise Intensity in the Chinese Mainland[J].Earthquake Research in China,2017,31(3):289-308. |
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| Authors: | Zhou Lianqing Song Xiaodong and Zhao Cuiping |
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| Institution: | Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, Beijing 100036, China;University of Illinois at Urbana-Champaign, Urbana IL 61801, USA;Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,University of Illinois at Urbana-Champaign, Urbana IL 61801, USA and Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, Beijing 100036, China |
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| Abstract: | Successive waveforms of the vertical component recorded by 888 broadband seismic stations in the China Seismography Network from January, 2010 to June, 2011 are used to investigate the temporal and spatial distribution of ambient noise intensity, and the images of ambient noise intensity at the period of 10s in the Chinese Mainland are obtained. The temporal variation of ambient noise intensity shows some seasonal and periodic characteristics. The maximum ambient noise intensity occurred from January, 2011 to March, 2011. The spatial distribution images of ambient noise intensity show obvious zoning features, which doesn''t correlate with surface geology, suggesting that the noise field is stronger than the site factors. The strength in southeastern coastal areas reaches its maximum and generally decreases toward to inland areas, and arrives at the minimum in the Qinghai-Tibetan Plateau. The zonal intensity distribution is probably correlated with ocean tides from the Philippine Ocean and the Pacific Ocean. It also shows that the influence from the Indian Ocean seems small. However, the ambient noise intensity increases to a certain degree in the Xinjiang area, indicating that the main source of ambient noise in the western area of the Chinese Mainland is not derived from the East and South China Sea, but rather from the deep interior of the Eurasian continent. The ambient noise intensity obtained in this study can supply reference for seismology research based on ambient noise correlation. Moreover, it can supply basic data for attenuation research based on ambient noise, and thus help achieve the object of retrieving the attenuation of Rayleigh waves from ambient noise. |
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| Keywords: | Ambient noise Noise source Amplitude of surface wave Attenuation |
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