| Crust and upper mantle structure in east China and sea areas |
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| 作者姓名： | 李红谊 刘福田 孙若昧 郑月军 彭艳菊 黄忠贤 |
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| 作者单位： | LI Hong-yi1) () LIU Fu-tian2) () SUN Ruo-mei2) () ZHENG Yue-jun1) () PENG Yan-ju1) () HUANG Zhong-xian1) () 1) Institute of Crustal Dynamics，China Seismological Bureau，Beijing 100085，China 2) Institute of Geology and Geophysics，Chinese Academy of |
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| 基金项目： | State Hi-Tech Development Project (8200104) and Natural Science Foundation of China (49874008). |
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| 摘 要： | Introduction Rayleigh wave is a kind of seismic wave propagating along the surface of the Earth, its propagation speed depends chiefly on the S-wave velocity structure of the Earth. Rayleigh wave energy of different periods concentrated in different depth ranges. The layered structure of the Earth causes the phenomenon of dispersion of surface waves, that is, surface waves of different periods are propagated with different speeds. By measuring the dispersion curves of surface waves the S-wav…
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| 收稿时间： | 25 October 2000 |
| 修稿时间： | 21 August 2001 |
Crust and upper mantle structure in east China and sea areas |
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| LI Hong-yi,LIU Fu-tian,SUN Ruo-mei,ZHENG Yue-jun,PENG Yan-ju,Huang Zhong-xian.Crust and upper mantle structure in east China and sea areas[J].Acta Seismologica Sinica(English Edition),2001,14(5):503-511. |
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| Authors: | LI Hong-yi LIU Fu-tian SUN Ruo-mei ZHENG Yue-jun PENG Yan-ju Huang Zhong-xian |
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| Institution: | 1. Institute of Crustal Dynamics, China Seismological Bureau,
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, |
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| Abstract: | Eastern China and vicinal sea areas (98~150E, 5~50N) are located in the junction zone of Eurasian and Pacific plates, and it is also profoundly influenced by the collision between Indian and Eurasian plates. We utilized surface wave data recorded by 35 digital seismic stations in the area, extracted dispersion curves of fundamental-mode Rayleigh waves along 1 252 paths by means of time-frequency analysis based on multiple-filter and other tech-niques. The study area was divided into a grid of 11, group velocity distributions of fundamental Rayleigh waves between 10~158 s were determined by Occams inversion. These velocity distributions roughly depict the lateral variations of shear wave velocities in different depth ranges. With the determined pure path dispersions we further inverted for the S wave velocity structures along two profiles from eastern Tibet to Pacific Ocean and from South China Sea to Mongolia. It is found that the lateral heterogeneity is obvious down to 400 km depth, and the velocity structures are correlated with tectonic units in the study area. |
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| Keywords: | Rayleigh wave group velocity inversion crust-upper mantle velocity structure CLC number: P313 2 Document code: A |
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