The role of trench retreat on the geometry and stress regime in the subduction complexes of the Mediterranean
Articolo
Data di Pubblicazione:
2004
Citazione:
The role of trench retreat on the geometry and stress regime in the subduction complexes of the Mediterranean / C. Rizzetto, A.M. Marotta, R. Sabadini. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - 31:11(2004 Jun 08), pp. L11604-1-L11604-4.
Abstract:
Numerical modelling of the Aegean and Calabrian subductions using geological reconstructions starting 75–80 Myr before the present reproduces the present-day geometries of the slabs and mantle wedges imaged by seismic tomography. The change from a shallow subduction dip of about 15° from the surface to a depth of 200 km into a dip of 60° below this depth in the Aegean subduction is caused by the south-west migration of the trench at the velocity of 3 cm/yr, obtained from GPS and geological data. The largest dip of 70° Calabrian subduction is caused by the termination of the active phase of opening of the Tyrrhenian back-arc basin and by the essentially purely gravitational sinking of the slab, in agreement with the null trench-migration velocity obtained from GPS data in Calabria. These two different tectonic settings are the ultimate causes of the different styles of seismicity within the two subduction complexes.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
C. Rizzetto, A.M. Marotta, R. Sabadini
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