Surface wave path corrections, deterministic discrimination and body wave attenuation. Semiannual technical report

Technical Report · Fri Oct 01 04:00:00 EDT 1982

OSTI ID:5311308

Farrell, W E; Stevens, J L; Savino, J M; Snkoller, B; Bache, L B

Rayleigh waves from the Eastern Kazakh test site recorded at Seismic research Observatory receivers have been analysed for phase-velocity dispersion, group velocity dispersion and spectral amplitude. Linear inversion theory has been used to interpret these data as arising from waves propagating in plane-layered earth models. This yields the mean shear velocity and attenuation over each path as well as the moment of the source. Using the path models, synthetic seismograms have been calculated for use in more refined estimated of source type and source strength. Multivariate linear discrimination has been used to distinguish synthetic body wave spectra of explosions from synthetic body wave spectra of earthquakes. The same algorithm with no modification is highly successful at distinguishing the body wave spectra for real events. High frequency attenuation of the spectra fro real data causes the deterministic discriminant to be biased. It is shown how the bias is used to infer t* (seismic attenuation). The attenuation parameter, t*, has been calculated for Kazakh-SRO and NTS-SRO paths for several score underground explosions. For NTS sources, t* is about 0.8. For Kazakh sources t* ranges between 0.2 and 0.8.

• Research Organization: S-Cubed, La Jolla, CA (USA)
• OSTI ID: 5311308
• Report Number(s): AD-A-133574/4; SSS-R-83-5776
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
ALGORITHMS
ASIA
ATTENUATION
CORRECTIONS
EARTHQUAKES
EASTERN EUROPE
EUROPE
FEDERAL REGION IX
MATHEMATICAL LOGIC
MATHEMATICS
MECHANICAL PROPERTIES
MULTIVARIATE ANALYSIS
NEVADA
NORTH AMERICA
RAYLEIGH WAVES
SEISMIC EVENTS
SEISMIC SURFACE WAVES
SEISMIC WAVES
SHEAR PROPERTIES
SPECTRA
STATISTICS
TEST FACILITIES
USA
USSR
VELOCITY