Abstract

Source-generated seismic noise has been studied in several areas of Oklahoma and Texas having distinctly different near-surface layering and velocities. Surface-wave velocities, particularly those of the propagating modes, are closely related to near-surface layer thickness and velocity. Modal structure is strongly influenced by the shooting parameters, of which charge depth is the most important.The Rayleigh or first propagating mode and the third propagating mode are readily identifiable on the noise records and agree satisfactorily with theory, if frequency-dependent attenuation and modal overlapping are taken into account. Leaky modes are identifiable on the basis of their high phase and group velocities but to date have defied quantitative comparison with theory.

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