Dependence of the apparent seismic quality factor on epicentral distance: an interpretation in terms of fractal structure of the seismic medium

Physics

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Scientific paper

Following Sato (1988a, b, Pageoph, 128:43-47) we evaluated an explicit formulation of the scattered energy in the single scattering approximation for a fractal distribution of scatterers in the lithosphere. We find that by using this hypothesis it is possible to explain the widely observed lapse time dependence of Q-coda and the distance dependence of the measured direct-wave Q. On the basis of this approach we can estimate the fractal dimension of the scatterers distribution by means of a simple fit of the experimental curves Q-coda versus lapse time (or distance). We estimated the fractal dimension of the scatterer distribution for a number of regions of Italy and New Mexico, finding that it is in the range 2-3 for all of the regions.

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