Geodesic
Geometrical spreading and $Q$ of $P_n$ waves
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 23, Tome 210 (1994), pp. 154-157 Cet article a éte moissonné depuis la source Math-Net.Ru

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Simple analytic formula for geometrical spreading and factor $Q$ of $P_n$ waves, propagating near the Moho is derived. Boundary layer theory and asimptotic expansions the small parameter: the ratio wave length to effective radious of curvature of Moho, are used. Bibliography: 6 titles. 
@article{ZNSL_1994_210_a12,
     author = {P. V. Krauklis and G. Kovalle},
     title = {Geometrical spreading and~$Q$ of~$P_n$ waves},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {154--157},
     year = {1994},
     volume = {210},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_210_a12/}
}
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P. V. Krauklis; G. Kovalle. Geometrical spreading and $Q$ of $P_n$ waves. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 23, Tome 210 (1994), pp. 154-157. http://geodesic.mathdoc.fr/item/ZNSL_1994_210_a12/