Abstract

Large differences in group velocities of short-period Rayleigh waves from strip mine blasts for different propagation paths in the Ozark Uplift-Illinois Basin area have been observed. Good well control in the area makes possible the construction of structural models of the sediments-basement system for these paths. Theoretical group velocities computed for these models agree well with observations, thus explaining the large variations in velocities in terms of basement-depth differences. This sensitivity of short-period surface waves to sedimentary thickness suggests an inexpensive, single-station technique of basin reconnaissance where commercial blasting is available.

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