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AuthorsAmoruso, A.*
Crescentini, L.*
Morelli, A.* 
Scarpa, R.*
TitleSlow rupture of an aseismic fault in a seismogenic region of Central Italy
Issue Date27-Dec-2002
Series/Report no.29/24(2002)
KeywordsEarthquake dynamics and mechanics
Seismic hazard assessment and prediction
Seismicity and seismotectonics
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.05. Rheology 
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
AbstractSlow earthquakes and afterslips prove that the Earth does not have just two response time scales, i.e. that of tectonic loading and that of regular earthquakes. A swarm of slow earthquakes, with time constants of the order of hundreds of seconds, has been detected by a laser interferometer below the Gran Sasso massif (Italy). We analyse and model these observations to identify a very plausible source in a local fault, with no historic seismic behavior. While slow earthquakes occurring in subduction zones, and at the transition between locked and stably sliding segments of the San Andreas fault, are often associated with seismic events, in the case of the Apennines there is no correlation between local seismicity and slow earthquakes. Slow earthquakes, therefore, may also represent a specific failure behavior for a seismically locked fault, adding further complexity to the interpretation of geologic data for seismic hazard estimates.
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