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http://hdl.handle.net/2122/361
Authors: | Barberi, G.* Cocina, O.* Maiolino, V.* Musumeci, C.* Privitera, E.* |
Title: | Insight into Mt. Etna (Italy) kinematics during the 2002–2003 eruption as inferred from seismic stress and strain tensors | Journal: | Geophysical Research Letters | Series/Report no.: | 21/31(2004) | Publisher: | AGU | Issue Date: | 13-Nov-2004 | DOI: | 10.1029/2004GL020918 | Keywords: | Seismology: Seismicity and seismotectonics Seismology: Volcano seismology Volcanology: Eruption mechanisms Volcanology: Magma migration |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology | Abstract: | Seismic activity linked to the 2002–03 Mt. Etna eruption was investigated by analyzing the Md > 2.3 earthquakes. The results of 3D relocation were used to compute fault plane solutions and a selected dataset was inverted to determine stress and strain tensors. The analysis revealed a complex kinematic response of the eastern flank dominated by fast stress propagation and reorientation. We hypothesize that a vertical dike intruded the southern flank, generating an extensional regime that triggered a radial intrusion in the northeast sector of the volcano. The combined effects gave rise to a rotation of the stress tensor that controlled the activation of the Pernicana fault system. The volcanic and tectonic interactions produced a second reorientation of the stress tensor, causing a structural response in the southeast lower flank. The overall result of the deformation processes observed during the eruption was an E-W extension on the eastern flank of the volcano. |
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