Surface Wave Group Velocity Distribution Based on Ambient Noise Analysis in Eastern Tibet

• 责任者：Gong Meng (Key Laboratory of Geo-Detection ; Ministry of Education ; China University of Geosciences ; Beijing 100083 ; China) ; Li Hongyi
• 刊名：Earth Science Frontiers
• 出版年：2010
• 卷期：17(5)
• 关键词：波群速度 ; group velocity ; 地壳结构 ; crustal structure ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.151-162
• 图表：7 illus., 47 refs.
• 分类号：0400
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

The obtained surface wave group velocity distribution in eastern Tibet from ambient noise analysis with the broadband seismic data recorded from January to December of 2008 at 76 stations from the Qinghai, Gansu and Sichuan Earthquake Administration digital seismic network. First, the authors used the multiple-filter analysis method to extract more than one thousand three-component surface wave group velocity dispersion curves from inter-station paths at periods from 5 to 50 s. Then the studied area was reticulated into a 0. 2°×0. 2° grid, and using O’ccam inversion method to obtain the Rayleigh (R-R)and Love (T-T) wave group velocity distribution. The results show that at the short periods (820 s), Sichuan Basin is clearly resolved with low group velocity due to its thick sedimentary layer, and the eastern part of Tibet shows relative higher group velocity distribution.