Seismic pulse propagation with constant Q and stable probability distributions

Details Seismic pulse propagation with constant Q and stable probability distributions Seismic pulse propagation with constant Q and stable probability distributions

2010-08-07

arxiv.org/abs/1008.1341v1

ANNALI DI GEOFISICA, Vol. 40, No 5, pp. 1311-1328 (1997)

Physics

Mathematical Physics

23 pages, 4 figures

Scientific paper

The one-dimensional propagation of seismic waves with constant Q is shown to be governed by an evolution equation of fractional order in time, which interpolates the heat equation and the wave equation. The fundamental solutions for the Cauchy and Signalling problems are expressed in terms of entire functions (of Wright type) in the similarity variable and their behaviours turn out to be intermediate between those for the limiting cases of a perfectly viscous fluid and a perfectly elastic solid. In view of the small dissipation exhibited by the seismic pulses, the nearly elastic limit is considered. Furthermore, the fundamental solutions for the Cauchy and Signalling problems are shown to be related to stable probability distributions with index of stability determined by the order of the fractional time derivative in the evolution equation.

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