Preliminary imaging of active faults in the Montello-Collalto area (Southeastern Alps, Italy) by a high-sensitivity seismometric network

The Montello-Collalto (MC) area, located at the front of Southeastern Alps, is very interesting for the high convergencerates documented by geodetic measurements; geological and geophysical surveys provide evidence of active compressivestructures. Historically this area has been struck by at least one event with M>6; during the last decades the seismicity has beenmoderate, with one MD=4.0 earthquake, and only few events with MD>3.At the end of 2011, a high-quality seismometric network has been deployed in the MC area for monitoring the seismicitypotentially induced by gas storage activities in an underground natural reservoir, depleted in the 90’ies. The network allows torecord background microseismicity with a completeness magnitude that reaches ML=0.0 locally. None of the 518 events of ourcatalogue (January, 1st, 2012 till October, 31st, 2014) is located in proximity of the reservoir; instead the imaging at depth of themain tectonic structures can be clearly depicted.