Abstract
Estimations of teleseismic P-wave attenuation beneath the French Massif Central allow two regions of strong attenuation to be identified, in the Devès-Velay and Cantal areas. These two abnormal regions of propagation are clearly correlated with lateral heterogeneities observed with the inversion of P-wave travel time residuals (Granet et al., 1995). Our thermomechanical modelisation shows that the thermal effect can explain only 8 % of the observed attenuation. Only the presence of fluids could explain the Q factor value lower than 100. The persistence of strong crustal perturbation shows that these two regions were key areas for the circulation of magmas in the crust during recent volcanic events.
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