• 责任者：Li Yonghua (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Wu Qiangju
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(6)
• 关键词：横波 ; S-wave ; 远震信号 ; teleseismic signals ; 青海 ; Qinghai Province
• 页码：p.1374-1383
• 图表：6 illus., 52 refs.
• 分类号：0500
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

Shear wave splitting analyses have been carried out using teleseismic data from 30 broad-band seismograph stations deployed at permanent locations in Qinghai Province, and the authors determined fast polarization directions φ, and delay times δt between fast and slow components using both the minimum energy method and rotation-correlation method. Shear wave splitting measurements show that there are variations with propagation directions beneath most stations. Analysis of individual measurements from multi-station highlights variations of splitting parameters with event backazimuth and can be best explained by a two-layer anisotropic model with horizontal symmetry axes. The optimal fast direction for the upper layer is in the 65°~95° range which is related to crust flow in this region. The fast direction for the lower layer ranges from 105° to 135° and can consequently be attributed to the ongoing NEE direction lithospheric shortening.