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http://hdl.handle.net/2122/5129
Authors: | Palano, M.* Gresta, S.* Puglisi, G.* |
Title: | Time-dependent deformation of the eastern flank of Mt. Etna: after-slip or viscoelastic relaxation? | Journal: | Tectonophysics | Series/Report no.: | /473(2009) | Publisher: | Elsevier | Issue Date: | 3-Aug-2009 | DOI: | 10.1016/j.tecto.2009.02.047 | Keywords: | 2002-03 Mt. Etna eruption Post-intrusive relaxation Viscoelastic After-slip Rheology |
Subject Classification: | 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring |
Abstract: | Major results of post-intrusive GPS monitoring of the five months encompassing and following the onset of 2002-03 Mt. Etna eruption are presented and discussed here. The overall ground deformation pattern is characterized by a time-dependent relaxation function. We evaluated two different parameterizations of relaxation functions, each one linked to a different relaxation process: i) viscoelastic relaxation and ii) after-slip mechanism. The former indicated that the process occurred within a weak layer characterized by viscosity values ranging between 7.1 • 1014 Pa s and 1.3 • 1015 Pa s. The latter evidenced that frictional processes occurred beneath a layer of velocity-strengthening having a thickness with values ranging between 0.4 km and 1.7 km. Either model may explain the observed time-dependent deformation, both from the statistical point of view and the comparison with geologic and seismic information. Although we are unable to favour one model rather than the other, these results indicate that the mechanism, responsible for the observed post-intrusive deformation, occurs within a sliding “zone” located inside the clayey sedimentary basement. |
Appears in Collections: | Article published / in press |
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