Anelasticity in the Earth by Frank D. Stacey, M. S. Paterson, A. Nicholas

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

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

The incontrovertible fact that the fabrics within the reliable components of the Earth go away from completely elastic behaviour is now critical to basic geophysical experiences. gradual deformation (creep) via the methods of mantle convection has been generally acknowledged for approximately 25 years; it's been realised much longer that seismic waves are attenuated yet extra lately there has built a basic if imprecise know-how of a possible correlation among excessive attenuation and occasional resistance to creep and within the previous few years seismic attenuation has obtained a lot larger realization since it implies a primary order dispersion of physique waves (frequency dependence of elasticity).

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OS stations at Raratongaand Brazilia, shows •a• thedl•ference in Q-1 measured at than nominal the different stations error is bound much greater from the least squares fit. The least squares fit, then measures the uncertainty in the single station measurement, rather than that between stations. We attribute the additional scatter to lateral heterogeneity, which is one cause of mode splitting [Madariaga, 1971; Usami, 1971; Saito, 1972; Luh, 1973, 1974]. Although individual singlets are not resolvable in this frequency band, a bias is introduced in the attenuation measurements [Buland, 1979].

4 Q and Standard Deviation of Fundamental Spheroidal Modes are Q-1 dataset used for the inversion, with error bars, is ulated in Table 1. Mode shown in figure 6 and tabIn the period range where 1/Q • the surface wave and normalmodeQ-1 data overlap the results are averaged. 00136 result. 00072 Sailor [1978] and Sailor and Dziewonski [1978]. Our analysis differs from theirs in that we used only fundamental spheroidal mode data, which we consider the best constrained, over a broader frequency range.

Geoph¾s. , 75, 5729- 5743, 1970. Weidner, D. , The effect of oceanic sediments on surface wave propagation, Bull. Seism. Soc. , 65, 1531-1552, 1975. COEFFICIENTS Copyright American Geophysical Union FOR RAYLEIGH WAVES 37 Geodynamics Series -1 Q Anelasticity in the Earth Vol. 4 MODELSFROM DATA SPACE INVERSION OF FUNDAMENTALSPHEROIDALMODE ATTENUATION MEASUREMENTS SethStein, Joseph M. Mills, Jr• andRobert J. Geller 1 1 Department of Geophysics, Stanford, CA 94305 2 Earth Sciences National Abstract.

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