Parametric Explosion Spectral Model

Ford, S R ; Walter, W R

关键词: ATTENUATION;    CONTAINMENT;    EARTHQUAKES;    UNDERGROUND EXPLOSIONS;    GEOLOGY;    DETECTION;    NUCLEAR EXPLOSIONS;    SEISMIC SOURCES;    SIMULATION;    SPECTRA;   

DOI  :  10.2172/1034507
RP-ID  :  LLNL-TR-523538
PID  :  OSTI ID: 1034507
Others  :  TRN: US201204%%49

美国|英语

来源: SciTech Connect

【 摘 要 】

Small underground nuclear explosions need to be confidently detected, identified, and characterized in regions of the world where they have never before occurred. We develop a parametric model of the nuclear explosion seismic source spectrum derived from regional phases that is compatible with earthquake-based geometrical spreading and attenuation. Earthquake spectra are fit with a generalized version of the Brune spectrum, which is a three-parameter model that describes the long-period level, corner-frequency, and spectral slope at high-frequencies. Explosion spectra can be fit with similar spectral models whose parameters are then correlated with near-source geology and containment conditions. We observe a correlation of high gas-porosity (low-strength) with increased spectral slope. The relationship between the parametric equations and the geologic and containment conditions will assist in our physical understanding of the nuclear explosion source.