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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8202

Authors: Malagnini, L.*
Herrmann, R. B.*
Buttinelli, M.*
Anselmi, M.*
Akinci, A.*
Boschi, E.*
Title: The 2012 Ferrara seismic sequence: Regional crustal structure, earthquake sources, and seismic hazard
Title of journal: Geophysical Research Letters
Series/Report no.: /39(2012)
Publisher: American Geophysical Union
Issue Date: 2012
DOI: 10.1029/2012GL053214
Keywords: 2012 Ferrara seismic sequence
regional crustal structure
seismic hazard
earthquake sources
Abstract: Inadequate 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 understand 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 earthquakes (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.
Appears in Collections:Papers Published / Papers in press
04.06.99. General or miscellaneous

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