Accession Number : AD0856110

Title :   Effects of Radiation Patterns on Spectra and Magnitude Estimates.

Descriptive Note : Seismic data lab. rept.,

Corporate Author : TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

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

Report Date : 28 MAY 1969

Pagination or Media Count : 33

Abstract : According to surface-wave radiation pattern theory, amplitude at any given period is a function of azimuth for a given tectonic source at a given depth. Also the shape of the observed spectra is dependent upon azimuth as well as depth and source type. For a source with a constant magnitude force system, a uniform far-field measurement of its strength, namely Ms, can vary by up to one unit of magnitude depending on angles of dip and slip. Body-wave radiation pattern theory predicts that amplitude will be dependent on take-off angle as well as azimuth. (Author)

Descriptors :   (*EARTHQUAKES, SEISMIC WAVES), POWER SPECTRA, SOURCES, RAYLEIGH WAVES, ATTENUATION, MATHEMATICAL ANALYSIS, COMPUTER PROGRAMMING, AZIMUTH, FAULTS(GEOLOGY), EARTH MODELS, MOTION, INTENSITY.

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE