We report two studies related to numerical modeling of seismic wave generation and propagation. In the first, numerical calculations of seismic wave scattering using the multiple multipole technique are compared to laboratory data that we collected in an ultrasonic experiment. The results demonstrate the validity of the multiple multipole approach for seismic wave propagation modeling. The second study investigates seismic radiation from explosively loaded cavities in isotropic and transversely isotropic ...
We investigate two topics related to seismic nuclear monitoring and discrimination. The first is elastic wave propagation in complex earth models containing lateral variations in elastic properties or irregular interfaces. We describe an improved boundary element technique based on the conjugate gradient method and apply it to study the effects of surface topography. We also investigate the usefulness of a hybrid modeling method that combines multiple multipole and finite element ...
Three studies related to nuclear monitoring and discrimination are reported. First, we present a new approach to modeling elastic wave scattering, based on multiple multipole Expansions. Numerical examples demonstrate that the new algorithm is a very general tool for solving relatively large and complex two dimensional scattering. problems. Second, we apply relative event location and waveform cross-correlation techniques to relocate four presumed nuclear explosions at the Balapan, Kazakhstan Test Site. ...
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