Abstract

Within the Alpine-Mediterranean deformational system, several interesting features in the physical properties of the upper mantle have been recognized through the regional analysis of surface-wave dispersion. A large upper mantle anomaly (UMA), here called the Tuscan UMA, has been identified in the area northeast of Corsica, which includes part of the northern Tyrrhenian Sea and part of the North-Central Apennines. This anomalous upper mantle area together with the upper mantle characteristics of the Tyrrhenian Sea, located further to the south, provides a natural framework for comprehensive interpretation of the large data set of geological and geophysical observations, such as land and marine geology, volcanism, gravity, magnetic data, seismic data and seismology, deep temperatures, and surface heat flow.

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