Abstract
Fundamental-mode Rayleigh wave attenuation data for stable and tectonically active regions of North America, South America, and India are inverted to obtain several frequency-independent and frequency-dependentQβ models. Because of trade-offs between the effect of depth distribution and frequency-dependence ofQβ on surface wave attenuation there are many diverse models which will satisfy the fundamental-mode data. Higher-mode data, such as 1-Hz Lg can, however, constrain the range of possible models, at least in the upper crust. By using synthetic Lg seismograms to compute expected Lg attenuation coefficients for various models we obtained frequency-dependentQβ models for three stable and three tectonically active regions, after making assumptions concerning the nature of the variation ofQβ with frequency.
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