The study is focusing on the stress and strain
inversions from focal mechanisms in a revised
seismotectonic zonation of northeastern Italy and western
Slovenia. The recent increase of monitoring capability of
the local seismic network, the updated geologicalstructural
model of the area, and the novelties emerged
from studies on the spatial organization of the seismicity
allowed a redefinition of the seismotectonic zones. The
stress and strain tensors inversion is inferred from 203
focal mechanisms, corresponding to earthquakes occurred
between 1984 and 2016 with coda-duration magnitude
range from 2.0 to 5.6. The inverted stress domains reveal
an articulated picture of the interaction of the Adria microplate
with the Eurasian plate. A dominant strike-slip stress
field characterizes the eastern part of the area, while the
seismotectonic zones of the central part are undergoing to
thrusting regime. The stress pattern inferred in the western
part of the study area outlines a complex picture with
prevailing strike-slip regime and dominant compression
only in a seismotectonic zone. The comparison of stress
and strain tensor orientations evidences a relative uniformity
of the crustal strength in the eastern and northwestern
zones of the study area. The central and western zones
appear to be characterized by planes of mechanical weakness
not favorably oriented for failure with respect to the
stress tensor.
