Istituto nazionale di geofisica e vulcanologia
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Seismotectonic sketch of the central Apennines
 
Synoptic view of the active faults and the seismogenic sources (DISS, version 3.1.1) of the central Apennines. Notice that the main extensional sources terminate to the northwest and to the southeast at the transverse OASL and ORL, respectively (from Vannoli et al. [2012]).