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in creator/contributor: "Rodean, H.C."  
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Inelastic processes in seismic wave generation by underground explosions

Description: Theories, computer calculations, and measurements of spherical stress waves from explosions are described and compared, with emphasis on the transition from inelastic to almost-elastic relations between stress and strain. Two aspects of nonspherical explosion geometry are considered: tectonic strain release and surface spall. Tectonic strain release affects the generation of surface waves; spall closure may also. The reduced-displacement potential is a common solution (the equivalent elastic so… more
Date: August 1, 1980
Creator: Rodean, H.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Elastic-wave radiation from spherical sources

Description: The radiation of spherical compressional waves from a spherical cavity in an ideal elastic solid is treated. The equations for the radiation source and field are written in terms of the reduced-displacement potential. The source equation is studied in terms of characteristic frequencies, corresponding periods and wavelengths, and damping. The field equations for the stresses, strains, radial displacement, etc., are reviewed with regard to the transitions between the near and far fields. The nat… more
Date: December 7, 1979
Creator: Rodean, H.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mass conservation for instantaneous sources in FEM3 simulations of material dispersion

Description: This report presents the results of a systematic study in which it is shown that the numerical integration errors in determining material mass content are negligible; the material phase-change model by itself is not a cause of material mass variation; and a linear relation between fractional mass change and fractional density change at the source center for given mesh and source geometries exists over a range of values from 10/sup -5/ to 10/sup -1/. This suggests that the omission of the par. d… more
Date: November 1, 1987
Creator: Rodean, H.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ISC origin times for announced and presumed underground nuclear explosions at several test sites

Description: Announced data for US and French underground nuclear explosions indicate that nearly all detonations have occurred within one or two tenths of a second after the minute. This report contains ISC origin-time data for announced explosions at two US test sites and one French test site, and includes similar data for presumed underground nuclear explosions at five Soviet sites. Origin-time distributions for these sites are analyzed for those events that appeared to be detonated very close to the min… more
Date: December 3, 1979
Creator: Rodean, H.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimum frequencies for regional detection of cavity-decoupled explosions

Description: The natures of compressional (P) waves that originate in the crust, propagate in the crust and upper mantle, and are observed as Pg, Pn, and anti P waves at regional distances are examined. The discussion includes the observed variations of amplitude with epicentral distance for these waves as well as an estimate of values for the specific dissipation function Q/sub ..cap alpha../ in different regions. Studies were made on theoretical source and propagation functions for direct, reflected, and … more
Date: March 21, 1979
Creator: Rodean, H.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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