Descr: This project addresses critical phenomenology questions on the generation and propagation of seismic and low frequency acoustic energy from a wide variety of shallow sources that impact the use of observations for source identification, location and characterization in areas with little ground truth. The study is done in Utah, Wyoming and Nevada a region with a variety of sources, a good regional seismic network, and an area where ground truth is available to develop models and tests. The program augments the existing Utah seismic network with 4 infrasound arrays; delivers the real-time data to IRIS for distribution; analyzes the Utah catalog and ground truth database to produce a calibrated library of seismic and infrasound signals from a wide variety of sources (mines, collapses, planned explosions, demolitions, etc); investigates the relationship between infrasound and earthquakes; adds a set of dense infrasound and seismic measurements to a planned 600-ton near –surface explosion at NTS (Divine Strake); produces a moment-tensor inversion of the Divine Strake experiment; investigates discriminants using the calibrated library and ground truth observations from the University of Utah; assesses infrasound signals as discriminants; and makes a detailed examination of infrasound propagation along a few paths.
