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|Authors: ||Villani, F.*|
|Title: ||Late Quaternary tectonics of the Vallo di Diano basin (southern Apennines, Italy)|
|Title of journal: ||Quaternary Science Reviews|
|Series/Report no.: ||23-24/29(2010)|
|Issue Date: ||Nov-2010|
|Keywords: ||fault scarp|
|Abstract: ||We discuss new data concerning the late Quaternary tectonics of the Vallo di Diano basin, the largest
intramontane depression in the southern Apennines chain (Italy).
The southern Apennines axis is currently subject to NEeSW extension. Here, active NW-trending
normal faults are associated with strong earthquakes (M > 6), with average recurrence times >1 ka. The
Vallo di Diano basin is a half-graben bounded by an extensional fault system VDFS (Vallo di Diano Fault
System), featuring three major NW-trending, SW-dipping, w15e17 km long fault segments. Holocene
faulting and possible historical seismicity have been documented only for the northern fault segment. No
major historical earthquakes can be associated with the other fault segments, and the recent sedimentary
and structural evolution of the basin is still poorly constrained. As a consequence, its seismogenetic
potential has probably been underestimated.
We found evidence of late PleistoceneeHolocene faulting in the relay zone of the central and southern
fault segments bordering the basin. Here, late Pleistocene volcaniclastic layers at the apex of an alluvial
fan are affected by normal displacements on the order of w1 m. Additionally, in the same area we
recognized a previously unreported, 9 km long and 0.5e1.4 km wide set of scarplets (ranging in height
between w1 m and 2.5 m) affecting late Pleistoceneelate Holocene alluvial fans. The last deformation is
younger than 3 ka BP.
Due to the geometric arrangement of these scarplets and the long-term displacement along the Vallo
di Diano Fault System, we hypothesize that the central and southern fault segments belong to a w32 km
long hard-linked system, capable of generating Mw > 6.5 earthquakes.
The Vallo di Diano basin is thus bounded to the east for its entire length (w45 km) by an active
segmented extensional fault system. Therefore it has to be considered one of the major seismogenic
sources in southern Italy.|
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