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AuthorsGovoni, A.* 
Passarelli, L.* 
Braun, T.* 
Maccaferri, F.* 
Moretti, M.* 
Lucente, F. P.* 
Rivalta, E.* 
Cesca, S.* 
Hainzl, S.* 
Woith, H.* 
De Gori, P.* 
Dahm, T.* 
Chiarabba, C.* 
Margheriti, L.* 
TitleInvestigating the Origin of Seismic Swarms
Issue Date8-Oct-2013
Series/Report no.41/94(2013)
Seismic Swarms
Seismic Hazard
Rapid Response Networks
Subject Classification04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
AbstractAccording to the U.S. Geological Survey’s Earthquake Hazards Program, a seismic swarm is “a localized surge of earth- quakes, with no one shock being conspicuously larger than all other shocks of the swarm. They might occur in a variety of geologic environments and are not known to be indicative of any change in the long- term seismic risk of the region in which they occur” ( Seismicitydescription_earthquakes.html). The definition reveals how little is actually known about seismic swarms. For example, could certain seismic settings be more prone to swarms? Could a fault zone prone to large energetic earthquakes release part of its stress through seismic swarms? Do swarms keep hazards in balance, or could their onset increase hazards? To gain insight into the nature of seismic swarms in nonvolcanic areas and to better understand their influence on seismic hazards, the Istituto Nazionale di Geofisica e Vulcanologia (INGV) and the German Research Centre for Geoscience (GFZ) began a combined research project within the framework of the Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation (NERA; see http:// The project focused on monitoring swarm activity occurring in the Pollino range in Southern Apennines, Italy.
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