Directional excitation of Rg due to ripple-fired explosions: 2-Dimensional finite-difference simulations

Conference · Mon Nov 01 04:00:00 EST 1993

OSTI ID:91013

Jih, Rong-Song ^[1]

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1. Teledyne Geotech Alexandria Labs., VA (United States)

A major issue for the Non-Proliferation Treaty is the discrimination of large chemical explosions from possible clandestine or small nuclear tests. Unless discrimination is possible, the numerous mining blasts could give ample opportunity for concealing clandestine tests. Ripple-fired explosions are commonly used to fragment rocks during quarry and open-pit mining. The periodicity inherent in the ripple firing could produce a seismic reinforcement at the frequency of the delay between shots or rows. It has been suggested that the convolution of a single explosion with a comb function of variable spacing and variable amplitude can be used to model the distinctive signature of ripple firing. Baumgardt and Ziegler (1988) delicately demonstrated that the incoherent array-stack spectra can be used to identify some multiple shots recorded at NORSAR. By superpositioning the waveform due to a single shot with proper time delay, they were able to model the source multiplicity under the assumption that the spatial spreading of the shots is negligible with respect to the distance to the receiver. The work by Stump et al. successfully characterized the major features of the wavefield due to ripple firings at near-source ranges.

• Research Organization: Los Alamos National Lab., NM (United States)
• OSTI ID: 91013
• Report Number(s): LA-UR--93-3839; CONF-930397--; ON: DE95003509; CNN: Contract F29601-91-C-DB23
• Country of Publication: United States
• Language: English

Related Subjects

35 ARMS CONTROL
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
CHEMICAL EXPLOSIONS
DETECTION
EXCITATION
MONITORING
NON-PROLIFERATION TREATY
NUCLEAR EXPLOSIONS
SEISMIC WAVES
TWO-DIMENSIONAL CALCULATIONS
WAVE PROPAGATION