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 Qβ are all that are required to accomplish this. Good results are obtained if the average crustal Qβ is equated to the coda Q of the same frequency.

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