Page 3 - 05 albarello

Finite element modelling of the recent-present deformation pattern in the Calabrian are and surrounding regions

block is recognized (Finetti and Del Ben, SE-NW to E-W extensional regime has af-
1986). A sinistra! shear along the Palinuro fault fected the Tyrrhenian margin of Calabria
system (PF) has decoupled the Calabrian are (Barone et al., 1982; Del Ben, 1993). Com-
from the Southem Apennines (Finetti and Del pressional deformations are recorded in the ex-
Ben, 1986; Cello et al., 1985; Reuther, 1990; tema! Calabrian are, offshore the Ionian coast
Van Dijk and Okkes, 1991). Other transform
faults have been active in Calabria (Ghisetti of Calabria. This feature is interpreted as an ef-
and Vezzani, 1982; Knott and Turco, 1991; Del fect of the overthrusting of the Calabrian
Ben, 1993), one of the most important of wedge over the thinned Ionian foreland (Rossi
which seems to be the Catanzaro fault (CZ). A and Sartori, 1981; Barone et al., 1982; Del
Ben, 1993).

12"E 14"

;+----- --------ll
l
1~

l
l
l
l
l
L ________ _

Fig. 2. Fault piane solutions of shallow earthquakes (h ::; 50 km) in the study area (Riuscetti and Schick,
1975; D'Ingeo et al., 1980; Gasparini et al., 1982, 1985; Giardini et al., 1984; Hfaiedh et al., 1985; Benina
et al., 1985; Anderson and Jackson, 1987; Westaway, 1987; Udias et al., 1989; Dziewonski et al., 1985,
1987a,b,c, 1991a,b). The horizontal projections of T and P axes are respectively represented by diverging
and converging arrows. Only axes dipping less than 30° are reported. Dashed lines identify the boundaries
of the «Calabria>> and <<Sicily>> zones, which have been considered for the analysis of stress and strain fields
(table I).

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