Quaternary tectonics and paleoseismologicalinvestigations have defined a reliable framework ofactive faults in the southern Umbria and AbruzziApennines. Two sets of NW–SE to NNW–SSE trending, 16to 33 km-long, normal and normal-oblique faults orfault systems have caused the displacement of...

Strong seismic events once again confirm the view that great destructive earthquakes are produced by the reactivation of pre-existing faults although they have usually remained inactive for many, perhaps thousands of years. It is evident that such active seismogenic zones, with little or no...