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Title: Basic research in nuclear test monitoring: Explosions in non-spherical cavities: Investigations of enhanced backscattering. Annual technical report, 1 August 1992-31 July 1993

Abstract

We report on two studies. The first is a theoretical study of the seismic radiation from explosions detonated in finite cylindrical tunnels embedded in a homogeneous, isotropic, elastic medium. We developed a frequency domain boundary element/discrete wavenumber algorithm to model the seismic wavefields from such sources, and applied the algorithm to study two specific cases of explosion sources-nuclear and non-nuclear. Our calculations show different source radiation patterns between the two types of explosions, especially when the explosion is located off-center in the tunnel in which case the non-nuclear explosion radiation displays strong directivity effects. Both types of explosions radiate significant shear wave energy outside the cavity. The second study is on enhanced seismic backscattering from rough interfaces. We experimentally and numerically investigate the scattering of an acoustic P wave incident on a highly irregular, random acoustic-elastic interface to determine whether enhanced backscattering occurs. The experiments involve ultrasonic waves reflected from a glass surface etched to produce a highly irregular 3-D surface. We find that 2-D numerical results predict the 3-D experimental results well at small incident angles. Both numerical and experimental results strongly support the presence of enhanced backscattering. Explosion seismology, Non-spherical cavities, Seismic scattering, Enhanced backscattering.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge, MA (United States). Earth Resources Lab.
OSTI Identifier:
7106294
Report Number(s):
AD-A-278477/5/XAB
CNN: F49620-92-J-0413
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; NUCLEAR EXPLOSIONS; MONITORING; CALCULATION METHODS; THEORETICAL DATA; DATA; EXPLOSIONS; INFORMATION; NUMERICAL DATA; 450300* - Military Technology, Weaponry, & National Defense- Nuclear Explosion Detection

Citation Formats

Mandal, B, Schultz, C A, Dong, W, Toksoez, M N, and Rodi, W. Basic research in nuclear test monitoring: Explosions in non-spherical cavities: Investigations of enhanced backscattering. Annual technical report, 1 August 1992-31 July 1993. United States: N. p., 1994. Web.
Mandal, B, Schultz, C A, Dong, W, Toksoez, M N, & Rodi, W. Basic research in nuclear test monitoring: Explosions in non-spherical cavities: Investigations of enhanced backscattering. Annual technical report, 1 August 1992-31 July 1993. United States.
Mandal, B, Schultz, C A, Dong, W, Toksoez, M N, and Rodi, W. 1994. "Basic research in nuclear test monitoring: Explosions in non-spherical cavities: Investigations of enhanced backscattering. Annual technical report, 1 August 1992-31 July 1993". United States.
@article{osti_7106294,
title = {Basic research in nuclear test monitoring: Explosions in non-spherical cavities: Investigations of enhanced backscattering. Annual technical report, 1 August 1992-31 July 1993},
author = {Mandal, B and Schultz, C A and Dong, W and Toksoez, M N and Rodi, W},
abstractNote = {We report on two studies. The first is a theoretical study of the seismic radiation from explosions detonated in finite cylindrical tunnels embedded in a homogeneous, isotropic, elastic medium. We developed a frequency domain boundary element/discrete wavenumber algorithm to model the seismic wavefields from such sources, and applied the algorithm to study two specific cases of explosion sources-nuclear and non-nuclear. Our calculations show different source radiation patterns between the two types of explosions, especially when the explosion is located off-center in the tunnel in which case the non-nuclear explosion radiation displays strong directivity effects. Both types of explosions radiate significant shear wave energy outside the cavity. The second study is on enhanced seismic backscattering from rough interfaces. We experimentally and numerically investigate the scattering of an acoustic P wave incident on a highly irregular, random acoustic-elastic interface to determine whether enhanced backscattering occurs. The experiments involve ultrasonic waves reflected from a glass surface etched to produce a highly irregular 3-D surface. We find that 2-D numerical results predict the 3-D experimental results well at small incident angles. Both numerical and experimental results strongly support the presence of enhanced backscattering. Explosion seismology, Non-spherical cavities, Seismic scattering, Enhanced backscattering.},
doi = {},
url = {https://www.osti.gov/biblio/7106294}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

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