caa a22 4500 475826256 CHVBK 20180406123829.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s004450000101 doi (NATIONALLICENCE)springer-10.1007/s004450000101 Volcanological inferences from seismic-strain tensor computations at Mt. Etna Volcano, Sicily [Elektronische Daten] [G. Barberi, O. Cocina, G. Neri, E. Privitera, S. Spampinato] Abstract.: Kostrov's (1974) algorithm for seismic-strain tensor computations, in the version implemented by Wyss et al. (1992a) for error estimates, has been applied to shear-type earthquakes occurring beneath the Etna volcano during 1990-1996. Space-time variations of strain orientations and amplitudes have been examined jointly with ground-deformation and gravimetric data collected in the same period and reported in the literature. Taking also into account the information available from volcanological observations and structural geology, we propose a model assuming that hydraulic pressure by magma emplaced in nearly north-south vertical structures produces the E-W orientation of the maximum compressive strain found in the upper 10km beneath the crater area. In contrast, regional tectonics deriving from the slow, north-south convergence between the African and European plates appear to play a dominant role in the generation of stress and strain fields at crustal depths deeper than 10km below the volcano. According to our interpretation, the progressive ascent of magma through the upper crust prior to eruption produces the observed gravity changes, cone inflation and unusual seismic strain rate in the upper 10km associated with a more sharply defined seismic deformation regime (i.e. very small confidence limits of the ε1 orientation). In agreement with this model, deflation revealed by ground-deformation data during the course of the major 1991-1993 eruption was accompanied by a practically nil level of shallow seismicity. Springer-Verlag, 2000 Mt. Etna Italy Earthquakes Seismic strain Stress inversion Volcanic processes nationallicence Barberi G. Dipartimento di Scienze della Terra, University of Messina, Salita Sperone 31, 98166 Messina, Italy aut Cocina O. Istituto Internazionale di Vulcanologia, CNR, Piazza Roma 2, 95123 Catania, Italy aut Neri G. Dipartimento di Scienze della Terra, University of Messina, Salita Sperone 31, 98166 Messina, Italy aut Privitera E. Istituto Internazionale di Vulcanologia, CNR, Piazza Roma 2, 95123 Catania, Italy aut Spampinato S. Istituto Internazionale di Vulcanologia, CNR, Piazza Roma 2, 95123 Catania, Italy aut https://doi.org/10.1007/s004450000101 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004450000101 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Barberi G. Dipartimento di Scienze della Terra, University of Messina, Salita Sperone 31, 98166 Messina, Italy aut NATIONALLICENCE 700 1- Cocina O. Istituto Internazionale di Vulcanologia, CNR, Piazza Roma 2, 95123 Catania, Italy aut NATIONALLICENCE 700 1- Neri G. Dipartimento di Scienze della Terra, University of Messina, Salita Sperone 31, 98166 Messina, Italy aut NATIONALLICENCE 700 1- Privitera E. Istituto Internazionale di Vulcanologia, CNR, Piazza Roma 2, 95123 Catania, Italy aut NATIONALLICENCE 700 1- Spampinato S. Istituto Internazionale di Vulcanologia, CNR, Piazza Roma 2, 95123 Catania, Italy aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer