Seismological observations play an important role in detecting and locating all nuclear events, determining their yields and distinguishing them from earthquakes and other chemical explosions. Regional phases play a critical role for small-yield nuclear test monitoring. Regional phases travel in the crust and the upper mantle, which are very heterogeneous, therefore, calibration of phase propagation characteristics within different tectonic and geologic environments is necessary to use regional phases for nuclear ...
We review the progress of a collaborative academic-industry research consortium, comprised of five institutions, that has started an integrated series of projects to improve the capability to locate seismic events based on data acquired by International Monitoring System (IMS) stations in Eastern Asia. This effort is to develop and deliver validated high-resolution travel time grids for operational use. During the first year of work we have focused on IMS stations ...
We develop two-dimensional (2-D) P-wave velocity models for the crust and for the upper mantle along the ultra-long Deep Seismic Sounding profile (DSS) 'Quartz'. Two-dimensional effects play a principal role in Lg propagation and are directly related to the problem of quantitative modeling of Lg and its use as a seismic discriminant. The use of DSS profiles provides us with unique opportunities to study large-scale propagation effects of various seismic ...
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