Abstract
Abstract Teleseismic body-wave magnitudes due to nuclear tests at Yucca Flat, Nevada, display a fluctuation of approximately ±0.2 m b units. The magnitude anomaly correlates well with geologic structure at this test site, and it is hypothesized that a seismic response model of the local structure could account for most of the variance in the magnitude observations. A detailed model of the geophysical structure along a profile near the center of Yucca Flat has been constructed from independent geologic and geophysical data. The seismic response of this model has been calculated for a global network of six observing stations. The theoretical m b anomaly compares favorably with the observed anomaly. Corrections to the observed magnitudes based on the model would result in an order of magnitude decrease in the variance of the observations.
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