Accession Number : AD0864299

Title :   Dependence of Theoretical and Observed Rayleigh-Wave Spectra on Distance, Magnitude, and Source Type.

Descriptive Note : Seismic data lab. rept.,

Corporate Author : TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

Personal Author(s) : Von Seggern, D. H. ; Lambert, D. G.

Report Date : 27 OCT 1969

Pagination or Media Count : 56

Abstract : Theoretical source spectra which are closely tied to empirical evidence from explosions and earthquakes are presented. The effects of the transfer functions of a layered media upon these source spectra are shown and a theoretical earthquake-explosion spectra ratio is defined for Rayleigh waves. Using spectral estimates on many widely distributed events, it has been found that explosions and earthquakes can be separated by splitting Rayleigh-wave energy between 10 and 50 seconds into two period bands and calculating their ratio. Explosion ratios are confined to a narrow range. Earthquake ratios have a large scatter because they depend on depth and source mechanism parameters. (Author)

Descriptors :   (*RAYLEIGH WAVES, SOURCES), (*UNDERGROUND EXPLOSIONS, DETECTION), SEISMIC WAVES, NUCLEAR EXPLOSIONS, TRANSFER FUNCTIONS, VELOCITY, RANGE(DISTANCE), CORRELATION TECHNIQUES.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE