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《应用地球物理(英文版)》 2005-01
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Converted-wave Seismology in Anisotropic Media Revisited, Part Ⅰ: Basic Theory

Xiangyang Li and Jianxin Yuan British Geological Survey, West Mains Road, Edinburgh EH9 3LA,UK. Formerly at British Geological Survey; now at PGS Inc., 10550 Richmond Avenue, Suite 300, Houston, TX 77042, USA.  
We have developed new basic theories for calculating the conversion point and the travel time of the P-SV converted wave (C-wave) in anisotropic, inhomogeneous media. This enables the use of conventional procedures such as semblance analysis, Dix-type model building and Kirchhoff summation, to implement anisotropic processing, and makes anisotropic processing affordable. Here we present these new developments in two parts: basic theory and application to velocity analysis and parameter estimation. This part deals with the basic theory, including both conversion-point calculation and moveout analysis. Existing equations for calculating the PS-wave (C-wave) conversion point in layered media with vertical transverse isotropy (VTI) are strictly limited to offsets about half the reflector depth (an offset-depth ratio, x/z, of 0.5), and those for calculating the C-wave traveltimes are limited to offsets equal to the reflector depth (x/z=1 .0). In contrast, the new equations for calculating the conversion-point extend into offsets about three-times the reflector depth (x/z=3.0), those for calculating the C-wave traveltimes extend into offsets twice the reflector depth (x/z=2.0). With the improved accuracy, the equations can help in C-wave data processing and parameter estimation in anisotropic, inhomogeneous media.
【Fund】: This work is funded by the Edinburgh Anisotropy Project (EAP) of the British Geological Survey
【CateGory Index】: P315.3
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