Dispersion splitting of Rayleigh waves in layered azimuthally anisotropic media |
| |
| Authors: | Shuang X Zhang Yu Wang Hua-Wei Zhou Lung S Chan |
| |
| Institution: | 1. Department of Physics, Boise State University, 1910 University Drive, Boise, ID 83725-1570, USA;2. Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng West Road, Guiyang 550081, Guizhou Province, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Puding Karst Ecosystem Observation and Research Station, Chinese Academy of Sciences, Puding 562100, PR China;4. School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550001, PR China;5. Institute of Agricultural Ecology and Rural development, Guizhou Normal College, Guiyang 550018, Guizhou Province, PR China;6. Puding County Science and Technology Service Center, Puding 562100, PR China |
| |
| Abstract: | Rayleigh wave dispersion can be induced in an anisotropic medium or a layered isotropic medium. For a layered azimuthally anisotropic structure, traditional wave equation of layered structure can be modified to describe the dispersion behavior of Rayleigh waves. Numerical stimulation results show that for layered azimuthal anisotropy both the dispersion velocities and anisotropic parameters depend principally on anisotropic S-wave velocities. The splitting S-wave velocities may produce dispersion splitting of Rayleigh waves. Such dispersion splitting appears noticeable at azimuthal angle 45°. This feature was confirmed by the measured results of a field test. The fundamental mode splits into two branches at azimuthal angle 45° to the symmetry axis for some frequencies, and along the same direction the difference of splitting-phase velocities of the fundamental model reaches the maximum. Dispersion splitting of Rayleigh waves was firstly displayed for anisotropy study in dispersion image by means of multichannel analysis of surface waves, the image of which provides a new window for studying the anisotropic property of media. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
