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By Frank D. Stacey, M. S. Paterson, A. Nicholas

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Published by way of the yankee Geophysical Union as a part of the Geodynamics Series.

The undeniable fact that the fabrics within the strong elements of the Earth leave from completely elastic behaviour is now imperative to basic geophysical stories. gradual deformation (creep) by means of the procedures of mantle convection has been broadly regarded for approximately 25 years; it's been realised much longer that seismic waves are attenuated yet extra lately there has built a normal if obscure wisdom of a likely correlation among excessive attenuation and occasional resistance to creep and within the previous couple of years seismic attenuation has got a lot better recognition since it implies a primary order dispersion of physique waves (frequency dependence of elasticity).

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Jobert, free N. and G. Roult, oscillations Periods observed sixteen earthquakes, 45, 155-176, 1976. in and damping of France Geophys. R. after astr. , 15, 105-112, 1977. Geophys. R. astr. , 47, Seism. Soc. • 66, 1189-1202, 1976. Mitchell, B. , Anelasticity of the crust and upper mantle beneath the Pacific Ocean from the inversion of attenuation, observed surface wave astr. • Geophys. R. 46, 521-533, 1976. Mitchell, B. , N. K. Yacoub and A. M. U. Monograph 20, 405-425, 1977. , Higher-mode Rayleigh waves studied as individual seismic phases, Earth Planet.

4. Observed and theoretical amplitudes for the modes 0 and 1 excited by event NH1 and observed in the station BKS (after both spatial and multiple frequency filtering). Three constant apparent Q values have been tried to compute the theoretical amplitudes (Q = 50,100, and Q = 200). The amplitudes are given in decibel versus the period T, the value 100 db corresponding to the maximum of the theoretical amplitude for the mode 0. 0 i••,,,,i IOO Vol. 4 A• IOO ß i": 4-NH2 •-- NH1 i' '-,3 ß 9o 200 0 ß NH3, NH4 •E 3OO 8o .....

The effect of changing the • / 8o elastic model is shown in Table IIa. Model 1 is a homogeneous layer approximation of the elastic Pacific model obtained by Cara (1978) from the same sets of records. Model 2 exhibits a less pronounced low velocity zone, the S velocity distribution with depth being close to the average model of the Earth 1066A (Gilbert and Dziewonski, 1975). Both models 1 and 2 are reasonable oceanic models and may be regarded as candidates for the source region of 20 60 I00 Period, sec Fig.

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