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《Chinese Journal of Geophysics》 2007-01
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Seismic sounding of anisotropic self-similar self-organized medium

LIU Yong-Xia~1,XU Tao~1,ZHAO Bing~1,LIU Chun-Cheng~(1,2)1 State Key Laboratory of Lithosphere Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China2 China National Offshore Oil Corporation,Tianjin 300452,China  
The multi-scale variation in composition and anisotropy in rocks and minerals may cause corresponding fractal variations of seismic velocity hence lead to self-organized models.Based on 2-D self-organized models with three layers and the acoustic finite difference method,we investigate the seismic sounding in the anisotropic self-similar medium to explain the volcano vertical or transverse intrusion in the earth.We find some interesting phenomena.In the horizontal intrusion medium,the diffraction and refraction of waves at randomly distributed inhomogeneities results in a random focusing and defocusing of wave energy and consequently results in an increase of the amplitude fluctuation with increasing propagation distances.When the lateral correlation length increases within the wavelength,focusing of energy will be enhanced.While it continues to increase beyond the wavelength,defocusing will play a main role and wave energy decreases greatly.In the self-similar media dominated by vertical intrusion,diffraction of seismic waves becomes noticeable.Moreover,the random amplitudes fortify the reflection energy and the large-scale velocity backgrounds influence the assembling of waves.We also investigated two-layer random medium like the crust,the result shows that seismic recordings from different layers carry selforganized characteristics of corresponding layer.Therefore,we can detect the characteristics of the earth in the field data.
【Fund】: 国家自然科学基金项目(40234044 40374010 40404009);; 科技部973项目(2002CB412604)资助
【CateGory Index】: P631.4
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