Lg Wave Excitation and Propagation with Application to Nuclear Yield Determination
Final rept. 1 Apr 1983-31 Mar 1985
SAINT LOUIS UNIV MO DEPT OF EARTH AND ATMOSPHERIC SCIENCES
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Malins 1980 first-order single scattering theory has been extended to study the scattering of surface waves as well as body waves by distributed point scatterers in a layered medium. The scattered waveform itself is generated and examined instead of its energy envelope. The theory used allows 1 mode conversion 2 wave type conversion 3 finite scatterer distribution and 4 the effect of attenuation from scattering as well as intrinsic absorption. The cases studied are for elastic or slightly attenuative media with any kind of source and receiver at any place in the layered structure. This direct calculation of coda waves provides us an immediate description of the relation of coda and scattering. The objectives are to find 1 the effect of layering on scattering 2 the effect of scatterer distribution on recorded vertical and horizontal motion 3 the relation of scattering Q to intrinsic Q 4 the scattering behavior of surface and body waves and 5 the superposition of scattering waves to form the coda. The generation of body waves by locked mode approximation, which makes the body wave a subset of the surface wave, is extensively studied.