Abstract
Analysis of infrasound signals is presented for a set of 31 earthquakes located mostly in the western United States and recorded at infrasound arrays operated by the Los Alamos National Laboratory. By normalizing measured amplitudes for the effects of propagation and distance, a pressure-amplitude versus earthquake magnitude relation is derived. Further analysis showed that the observed variance in this relation is likely due to the variation in source ground motion and variation in upper atmospheric winds. Signal durations can be tens of minutes and azimuth deviations have a mean of three degrees (measured from array data compared to great circle azimuths). Other characteristics of the infrasound data will be discussed. Our analysis of the observed data combined with surface ground motion accelerations, led to estimates of the minimum surface accelerations needed to generated infrasound signals measured at distant arrays.
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