A reappraisal of shear wave splitting parameters from Italian active volcanic areas through a semiautomatic algorithm

Francesca Bianco (1) , Lucia Zaccarelli (1)

1 Osservatorio Vesuviano

Shear wave splitting parameters represent a useful tool to detail the stress changes occurring in volcanic environments before impending eruptions. In the present paper, we display the parameter estimates obtained through implementation of a semiautomatic algorithm applied to all useful datasets of the following Italian active volcanic areas: Mt. Vesuvius, Campi Flegrei, and Mt. Etna. Most of these datasets have been the object of several studies (Bianco et al., Annali di Geofisica, XXXXIX 2:429–443, 1996, J Volcanol Geotherm Res 82:199–218, 1998a, Geophys Res Lett 25(10):1545–1548, 1998b, Phys Chem Earth 24:977–983, 1999, J Volcanol Geotherm Res 133:229–246, 2004, Geophys J Int 167(2):959–967, 2006; Del Pezzo et al., Bull Seismol Soc Am 94(2):439–452, 2004). Applying the semiautomatic algorithm, we confirmed the results obtained in previous studies, so we do not discuss in much detail each of our findings but give a general overview of the anisotropic features of the investigated Italian volcanoes. In order to make a comparison among the different volcanic areas, we present our results in terms of the main direction of the fast polarization () and percentage of shear wave anisotropy ().

Mots clés: Shear wave splitting parameters; Temporal variations; Volcano seismology; Semiautomatic techniques

Francesca Bianco, Lucia Zaccarelli. A reappraisal of shear wave splitting parameters from Italian active volcanic areas through a semiautomatic algorithm. Journal of Seismology, 2008, 13 (2), pp.253-266. ⟨10.1007/s10950-008-9125-z⟩. ⟨hal-00478438⟩