Abstract
Atmospheric infrasound data and co-located, three-component seismic data have been collected by the eight microbarometers of the International Monitoring System (IMS) station and the IRIS seismic station at Pinon Flat (PFO) plus five additional microbarometer/space filter systems at five Anza seismic stations located within 40-km range of PFO in Southern California. Characteristics of the infrasound and seismic recordings from this large-horizontal-aperture array of signals from 400-km-distant rocket launches at Vandenberg Air Force Base are analyzed using waveguide invariant theory. The Navy standard Gaussian Ray Bundle (GRAB) underwater acoustic propagation code (with slight modifications), along with launch trajectory information and atmospheric data collected at the time of the launches, is used to to examine the predictability of the signal arrival structure. The predictions take into account the signal-distorting effects caused by phase delays across the spatial aperture of the space filters, which cause each infrasound array element to be directional over the frequency band of interest. [Work supported by the Defense Threat Reduction Agency.]
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