Fagliazione superficiale olocenica e paleoliquefazione nel sito di Monte Netto, Brescia : implicazioni sismotettoniche

In the framework of a regional project aimed at the assessment
of seismic hazard in Lombardia based on geological criteria, the first
evidence for Holocene coseismic surface faulting unequivocally associated
with a Quaternary compressional structure of the Po Plain Foredeep
has been identified in a quarry located at Monte Netto, few
km S of Brescia. Paleoliquefaction features have been also observed
at the same site. The availability of a seismic reflection profile (courtesy
of ENI E&P) running exactly beneath the Monte Netto anticline
allows in fact to understand in detail the structural relations
between the geometry of the causative backthrust at depth and the
surficial ruptures observed in the quarry. The implication that capable
faulting might characterize the active tectonics of the Southern
Alps in Lombardia calls for a thorough re-evaluation of the seismotectonic
models for this region, and a systematic application of paleoseismological
analyses.