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Vol. 34, n.133, March 1992
pp. 29 - 40

Body-wave velocity model in the upper mantle of the southern Tyrrhenian region

A. Bottari, B. Federico and E. Stillitani

Abstract

This modelling of propagation velocity for body waves in the upper mantle of the Southern Tyrrhenian region, the subject of previous studies, was done with the ray-tracing method. The results of previous analyses provided the elements needed for a suitable model of the crust-mantle velocity to be used in the methodology. The velocities of the body waves in the mantle of the analyzed region were determined with an iterative version of the ray-tracing methodology, together with other statistical procedures. The results obtained show a gradually increasing trend for P wave velocities, whereas for the S waves an almost uniform trend was found for the whole region. Apart from the fact that the ray-tracing analysis does not show great variations of velocity, which is related to the presence of a lithospheric body, these results lead to the conclusion that the zone of mantle investigated is anomalous in terms of its kinematic quantities. A comparison with other velocity models found in the literature confirms this anomalous nature of the kinematic quantities for the mantle of the Southern Tyrrhenian basin.

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