Accession Number : ADP204483

Title :   Analysis of the Seismic Characteristics of U.S. and Russian Cavity Decoupled Explosions,

Corporate Author : MAXWELL LABS INC LA JOLLA CA S-CUBED DIV

Personal Author(s) : Murphy, J. R. ; Kitov, I. O. ; Rimer, N. ; Sultanov, D. D. ; Barker, B. W.

PDF Url : ADP204483

Report Date : 14 AUG 1995

Pagination or Media Count : 10

Abstract : The cavity decoupling evasion scenario remains as the greatest challenge to effective seismic monitoring of any eventual CTBT. However, despite the fact that the feasibility of this evasion concept was experimentally established nearly 30 years ago by the U.S. STERLING test, a number of issues of importance with respect to seismic monitoring still remain unresolved. In an attempt to address some of these issues, we have been working with scientists from the Russian Institute For Dynamics of the Geospheres to integrate the limited U.S. and Russian data and modeling experience into a uniform database on cavity decoupling. During the past year, our research has centered on analyses of data recorded from an extensive series of Russian HE cavity decoupling tests conducted in Kirghizia in 1960 and on analyses of seismic data recorded from six Russian nuclear tests conducted in a water-filled cavity at Azgir. The Kirghizia HE cavity decoupling series consisted of 10 tamped and 12 cavity tests in limestone, and included tests of the same yield in both spherical and nonspherical cavities of equal volume. Comparisons of near-field seismic data recorded from these tests indicate that the low frequency decoupling effectiveness is approximately independent of cavity shape for roughly cylindrical cavities with length to width ratios of 6 or more, in agreement with previous theoretical simulation results. Spectral analyses of waveform data recorded at the same distances from 1.0 ton tamped explosions and from a 1.0 ton decoupled test in a spherical cavity with a radius of 2.88 m indicate a maximum low frequency decoupling factor of about 25 for this test.

Descriptors :   *SEISMIC DETECTION, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, DATA BASES, USSR, YIELD(NUCLEAR EXPLOSIONS), UNITED STATES, SYMPOSIA, VERIFICATION, MONITORING, DISPLACEMENT, UNDERGROUND EXPLOSIONS, CAVITIES, NUCLEAR EXPLOSION SIMULATION, NUCLEAR EXPLOSION TESTING, SEISMIC DATA, LIMESTONE, RUSSIA, EVASION, SEISMIC DISCRIMINATION, TREATIES, SPECTRUM ANALYSIS, HIGH EXPLOSIVES.

Subject Categories : Government and Political Science
      Seismology
      Seismic Detection and Detectors
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE