Accession Number : ADA290881

Title :   Characteristics of Rockbursts for Use in Seismic Discrimination.

Descriptive Note : Final rept. Nov 91-Oct 93,

Corporate Author : MAXWELL LABS INC SAN DIEGO CA

Personal Author(s) : Bennett, Theron J. ; Marshall, Margaret E. ; Barker, Brian W. ; Murphy, John R.

PDF Url : ADA290881

Report Date : JAN 1994

Pagination or Media Count : 103

Abstract : As a result of changing emphases in nuclear explosion monitoring, alternative types of seismic sources have become significant. This research program was designed to investigate the identification of one such source type - rockbursts. Development of a reliable scheme to separate these sources from other events is important for CTBT and non-proliferation monitoring. Our research has found that rockbursts occur in many seismic and aseismic regions throughout the world. In many areas rockbursts are frequent and they may be large (M > 5). Seismic waveform databases were assembled for two geographical regions: Central Europe and South Africa. Discrimination analyses, including comparisons of time domain and spectral measurements of signals for different source types, have been performed on selected events. Because of the nature of rockbursts, some traditional discriminants, such as those related to focal depth, cannot be used. The most promising characteristics of rockburst seismic signals for discrimination seem to be spectral behavior and complexity. With regard to evasion the predictability of rockburst occurrence and size may offer the potential for concealment of a small or decoupled nuclear explosion test.

Descriptors :   *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, DATA BASES, VERIFICATION, MONITORING, WAVEFORMS, DEPTH, RELIABILITY, TREATIES, GEOGRAPHIC AREAS, SPECTRUM ANALYSIS, TIME DOMAIN, SEISMIC SIGNATURES, SEISMOLOGY, SOUTH AFRICA, ASEISMIC AREAS, CENTRAL EUROPE.

Subject Categories : Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE