Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9545
AuthorsMalagnini, L.* 
Herrmann, R. B.* 
Munafò, I.* 
Buttinelli, M.* 
Anselmi, M.* 
Akinci, A.* 
Boschi, E.* 
TitleThe 2012 Ferrara seismic sequence: Regional crustal structure, earthquake sources, and seismic hazard
Issue Date2012
Series/Report no./39 (2012)
DOI10.1029/2012GL053214
URIhttp://hdl.handle.net/2122/9545
Keywordsearthquake sources, seismic hazard
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
AbstractInadequate seismic design codes can be dangerous, particularly when they underestimate the true hazard. In this study we use data from a sequence of moderate-sized earthquakes in northeast Italy to validate and test a regional wave propagation model which, in turn, is used to under- stand some weaknesses of the current design spectra. Our velocity model, while regionalized and somewhat ad hoc, is consistent with geophysical observations and the local geology. In the 0.02–0.1 Hz band, this model is validated by using it to calculate moment tensor solutions of 20 earth- quakes (5.6 MW 3.2) in the 2012 Ferrara, Italy, seismic sequence. The seismic spectra observed for the relatively small main shock significantly exceeded the design spectra to be used in the area for critical structures. Observations and synthetics reveal that the ground motions are dominated by long-duration surface waves, which, apparently, the design codes do not adequately anticipate. In light of our results, the present seismic hazard assessment in the entire Pianura Padana, including the city of Milan, needs to be re-evaluated. Citation: Malagnini, L., R. B. Herrmann, I. Munafò, M. Buttinelli, M. Anselmi, A. Akinci, and E. Boschi (2012), The 2012 Ferrara seismic sequence: Regional crustal structure, earthquake sources, and seismic hazard, Geophys. Res. Lett., 39, L19302, doi:10.1029/ 2012GL053214.
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