Dispersion curves and mode energy distribution of Rayleigh wave based on wavefield numerical simulation
Shao Guangzhou1, Li Qingchun1, Wu Hua2
1. School of Geology Engineering and Geomatics, Chang'an University, Xi'an, Shaanxi 710054, China;
2. School of Science, Chang'an University, Xi'an, Shaanxi 710054, China
Abstract:In the seismic exploration, Rayleigh wave dispersion curves are usually extracted from the time-domain seismic records, which involve shooting modes. Dispersion curves with different energy by different shooting modes correspond to different frequency bands. And those in low-energy frequency band cannot be extracted. Therefore, for dispersion curves based on dispersion equation, not all the modes of seismic records can be stimulated. The dispersion curve characteristics of each mode and its actual shooting conditions have to be analyzed by time domain seismic records. A numerical simulation method is adopted first to obtain simulated records of Rayleigh waves. Then dispersion curves are extracted from these records. Finally, these extracted dispersion curves are compared with the theoretical dispersion curves from dispersion function to analyze their characteristics and frequency range for different modes. The multiple-mode dispersion characteristics and its mode energy distribution in the Rayleigh wave field are also summarized in this paper.
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Shao Guangzhou, Li Qingchun, Wu Hua. Dispersion curves and mode energy distribution of Rayleigh wave based on wavefield numerical simulation. OGP, 2015, 50(2): 306-315.
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