Accession Number ADA568811
Title Source Physics Experiment: Research in Support of Verification and Nonproliferation.
Publication Date Sep 2011
Media Count 12p
Personal Author C. R. Bradley D. Coblentz E. Rougier H. J. Patton W. M. Brunish
Abstract The Source Physics Experiment (SPE-N) was designed to provide a carefully controlled seismic and strong motion data set from buried explosions at the Nevada National Security Site (NNSS). The first experiment in a series (SPE1) was conducted in May of this year. It consisted of a 100 kg high explosive stemmed for coupling at 180 feet below the surface. In preparation for this experiment, predictive hydrodynamic calculations were performed, strong ground motion free-field and surface gauges were fielded, and a dense network of seismometers and some complimentary infrasound sensors were deployed. The data return for a majority of these sensors was excellent. This paper reports on a finite element analysis of the observable effects of an explosion in realistic earth material with particular focus on predicted and observed strong ground motion patterns. The model correctly incorporates the near-field cavity dynamics, energy deposition partitioned into internal (heat and plastic strain) and kinetic (e.g., radiated seismic) energy, giving more confidence in predicted free-field displacement/velocities and measured attenuation of the free-field peak velocity with distance. The degree of source asymmetry is studied with predictions of the hydrodynamic calculations for close-in free-field particle velocities. We present progress in improving our near-source modeling and predictive capabilities. A number of material test are presented on the granodiorite for both intact and weathered/damaged rock samples. These were used to improve our material model for the near-source environment. Additionally, a detailed 3D geologic framework model was created to represent the complex heterogeneities in the near-source environment (topography, faults, lithology, saturation and weathering).
Keywords Data bases
Ground motion
Spe-n(Source physics experiment)

Source Agency Non Paid ADAS
NTIS Subject Category 48F - Geology & Geophysics
Corporate Author Los Alamos National Lab., NM.
Document Type Technical report
Title Note Conference paper.
NTIS Issue Number 1312
Contract Number DE-AC52-06NA25396/LA10

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