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http://hdl.handle.net/2122/1417
Authors: | Barberi, G.* Caccamo, D.* De Luca, G.* Neri, G.* Scarpa, R.* |
Title: | Seismic response to stress-strain fields in the lithosphere of Sicily | Issue Date: | Oct-1999 | Series/Report no.: | 5/42 (1999) | URI: | http://hdl.handle.net/2122/1417 | Keywords: | stress strain lithosphere Sicily |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress 05. General::05.02. Data dissemination::05.02.02. Seismological data |
Abstract: | Earthquake locations and fault-plane solutions are investigated in Sicily and the surrounding areas, by using local network data for the period 1988-1995, and a recently proposed 3D model of the local crustal structure. The results were used for local-to-regional scale stress inversion and strain tensor computations, after integration by a set of selected focal mechanisms taken from the literature. The area under study appears to be affected by heterogeneity of seismic deformation and the stress field. The contraction-to-extension transition from west to east on a regional scale can find a reasonable explanation in the framework of current geodynamic models, such as those assuming the activity of two main tectonic sources in the South Italy region, e.g., the Africa-Europe north-south slow convergence and the faster eastward roll-back of a westward-dipping Ionian subducting slab (Cinque al., 1993). The analysis of low-magnitude (2.5-4.0) earthquakes permitted us to perform an investigation of local-scale strain heterogeneities in this region and to evidence notable changes in the deformation style when processes at different scales are considered. |
Appears in Collections: | Annals of Geophysics |
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