Analysis of dispersion and attenuation of surface waves in poroelastic media in the exploration-seismic frequency band

摘要: SUMMARY We analyse dispersion and attenuation of surface waves at free surfaces possible vacuum/poroelastic media: permeable—‘open pore’, impermeable—‘closed pore’ partially permeable boundaries, which have not been previously reported in detail by researchers, under different surface-permeable, viscous-damping, elastic fluid-flowing conditions. Our discussion is focused on their characteristics the exploration-seismic frequency band (a few through 200 Hz) for near-surface applications. We find two surface-wave modes exist, R1 all conditions, R2 closed-pore For waves, velocities disperse most conditions least open-pore condition. High-coupling damping coefficients move main range to high frequencies. There an f1 dependence as a constant-Q model open pore are sensitive modulus variation, but tortuosities variation. radiate non-physical (Im(k) < 0) low slightly lower than bulk slow P2 waves. At frequencies, both velocity diffusive f1/2 dependence, It found that surfaces, displays −f1 increasing. High permeability, low-coupling coefficients, Poisson's ratios, increase slope dependence. When reach 0, begin