Research on the Upper Mantle Seismic Anisotropy Beneath Hubei and Its Geodynamic Implication

详细信息   

• 责任者：Zhang Lifen (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Yao Yunsheng
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(1)
• 关键词：上地幔 ; upper mantle ; 各向异性 ; anisotropy ; 大别山 ; Dabie Mountains
• 页码：p.35-43
• 图表：5 illus., 1 table, 40 refs.
• 分类号：0400
• 出版序号：20120070
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

In this paper, Hubei digital seismograph network and China Broadband Digital Seismograph Network are used to analyze the direction and extent of seismic anisotropy. The authors use the rotation correlation method and the technique of Silver and Chan to determine SKS wave splitting parameters at 27 three-component broadband stations in Hubei area, including the azimuths of fast polarization direction and delay times of split shear wave. Combining with the structural evolution process, the authors infer that the preferred orientation of NWW maybe reflects the north-south-trending compression and collision of Yangtze block and North China block, and the mantle flow is the power source leading to this compression. And the preferred orientation of NE in Yangtze platform should have a certain relation with the change of stress field after the late-Yanshan stage.