High attenuation and the low-velocity zone

Details High attenuation and the low-velocity zone High attenuation and the low-velocity zone

Apr 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7...39g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 7, Issue 1, p. 39-46.

Physics

5

Scientific paper

Both elastic and anelastic properties of the earth simultaneously play an important role in the high-attenuation, low-velocity zone (H.A.L.V.Z.), in the upper mantle, where the drop of velocity appears to be correlated with high attenuation. Internal friction studies and experiments suggest the possibility of relaxation mechanisms occurring within the H.A.L.V.Z. and clearly it is important to compare assumptions sof relaxation processes with seismic data and investigate the consequences of such a model. A variety of physical explanations of the H.A.L.V.Z. are discussed and it is concluded that three mechanisms could produce the H.A.L.V.Z., namely partial melting, viscous grain-boundary effects and dislocation-impurity interactions. Only more experiments and more data on the Q-structure of the H.A.L.V.Z. would allow us to decide which is the most probable of these mechanisms. Now at Ecole Normale Supérieure de Saint-Cloud, Saint Cloud, France.

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