Previous studies have indicated that the crust and upper mantle beneath the Caltech‐USGS large seismic array, SCARLET, is extremely heterogeneous. In this study, Chernov theory has been applied to characterize the crust and upper mantle as a random medium. The data consist of travel‐time residuals from plane waves fit to teleseismic arrival times. Amplitude data were not available. Consistent results were obtained for events arriving from the NW, SW and SE and indicate a correlation distance for the inhomogeneities of 25 km and a maximum velocity perturbation of 3.26%. The random medium extends to a minimum depth of 119 km. Although these values are similar to those obtained for other arrays, they indicate that it may be improper to apply Chernov Theory to teleseismic P‐waves with dominant frequencies near 1 Hz.
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Powell et al. (1984) studied this question.