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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 proven fact that the fabrics within the strong components of the Earth leave from completely elastic behaviour is now principal to basic geophysical experiences. gradual deformation (creep) by way of the strategies of mantle convection has been extensively acknowledged for approximately 25 years; it's been realised much longer that seismic waves are attenuated yet extra lately there has constructed a basic if imprecise understanding of a possible correlation among excessive attenuation and occasional resistance to creep and within the previous couple of years seismic attenuation has bought a lot larger realization since it implies a primary order dispersion of physique waves (frequency dependence of elasticity).

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These the observed than -6 db instabilities amplitudes and -10 db occur are respectively of 7). with the maximum This the when lower observed suggests residual an first higher Rayleigh mode. An independent convincing argument may be added. 5 cycle, a value which can explain a strong beat amplitudes of event NH3 at two stations of the array: BKS and AAM. The difference in epicentral effect distance major role in the experimental efficients •¾no have been estimated at two between The coefficients the two stations is 3264 km.

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. Sci. , 43, 162-167, 1979. , B. L. Isacks, M. Barazangui and J. Dubois, Precise relocations of earthquakes and seismotectonics of Arcs, J.

From the As 1960 the data Chilean for and these 1964 modes Alaskan are earth- quakes, recorded only at single stations on older instruments than those of the IDA network, our error bounds are fairly broad. These error bounds are quite realistic, though, as can be seen by comparison with other studies. The results (tabulated in Stein and Geller, 1978b) mode. 2 the error bars to provide an estimate and Jensen [1979] all fall within of the scatter in different measurements of Q-1 the for each mode.

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