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DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES SAINT LOUIS UNIVERSITY, P.O. BOX 8099, LACLEDE STATION, ST. LOUIS, MISSOURI 63156
INSTITUTE OF GEOPHYSICS POLISH ACADEMY OF SCIENCES, PASTEUR STREET NO. 3, 00973 WARSAW, Poland
Abstract
Higher mode surface wave theory is used to model the vertical component Lg wave observed in eastern North America at regional distances. Tests of the model are made to determine whether it is capable of describing empirical spectral scaling laws, spatial attenuation, and peak time domain Lg amplitudes. It is found that a simple crustal model and a rough estimate of crustal Qß are all that are required to accomplish this. Good results are obtained if the average crustal Qß is equated to the coda Q of the same frequency.
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