Accession Number:

ADA305955

Title:

Further Studies of the Seismic Characteristics of Russian Explosions in Cavities: Implications for Cavity Decoupling of Underground Nuclear Explosions.

Descriptive Note:

Final rept. Aug 93-Nov 95,

Corporate Author:

S-CUBED LA JOLLA CA

Report Date:

1996-01-01

Pagination or Media Count:

79.0

Abstract:

This report provides a summary of the results of a joint research program under which scientists from S-CUBED have been working with scientists from the Russian Institute for Dynamics of the Geospheres in an attempt to develop a better understanding of the effects of cavity decoupling on the seismic signals produced by underground nuclear explosions. Investigations conducted under this program have focused on analyses of seismic data recorded from a series of HE cavity decoupling experiments conducted by the Russians in Kirghizia in 1960, and from a sequence of nuclear tests conducted in a water-filled cavity at the Soviet Azgir test site during the period 1975-1979. The Kirghizia series included tests designed to assess the influence of cavity geometry on decoupling effectiveness, and comparisons of near-field seismic data recorded from these tests indicate that the low frequency decoupling factor is independent of cavity shape for elongated cavities with length to width ratios of 6 or more, in agreement with previous theoretical simulation results. Broadband seismic data recorded from the Azgir water-filled cavity tests are analyzed to estimate cavitytamped source spectral ratios, and the results are compared with theoretical finite difference simulations of these tests.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors
  • Nuclear Weapons

Distribution Statement:

APPROVED FOR PUBLIC RELEASE