FREQUENCY-DEPENDENT ATTENUATION OF LOVE WAVES AND ITS ESTIMATION

A modification of the spectral ratio method is presented to invert the frequency-dependent quality factor of Love-waves as the classical spe ctral ratio method can only be valid for a constant quality factor. A simple symmetric three-layered linear elastic model is used because it s frequency-dependent attenuation relation can be given explicitly ass uming that the quality factor of the coal and the country rock is cons tant. Synthetic seismograms are computed for this simple three-layered model to demonstrate the superiority of the modification to the class ical spectral ratio method.