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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9044

Authors: Govoni, A.*
Marchetti, A.*
De Gori, P.*
Di Bona, M.*
Lucente, F. P.*
Improta, L.*
Chiarabba, C.*
Nardi, A.*
Margheriti, L.*
Agostinetti, N. P.*
Di Giovambattista, R.*
Latorre, D.*
Alselmi, M.*
Ciaccio, M. G.*
Moretti, M.*
Castellano, C.*
Piccinini, D.*
Title: The 2012 Emilia seismic sequence (Northern Italy): Imaging the thrust fault system by accurate aftershock location
Title of journal: Tectonophysics
Series/Report no.: /622(2014)
Publisher: Elsevier Science Limited
Issue Date: 2014
DOI: 10.1016/j.tecto.2014.02.013
URL: http://www.sciencedirect.com/science/article/pii/S0040195114001139
Keywords: Seismology
Hypocentral location
Seismic sequence
Velocity model
Thrust fault system
Po alluvial Plain
Abstract: Starting from late May 2012, the Emilia region (Northern Italy) was severely shaken by an intense seismic sequence, originated from a ML 5.9 earthquake on May 20th, at a hypocentral depth of 6.3 km, with thrusttype focal mechanism. In the following days, the seismic rate remained high, counting 50 ML ≥ 2.0 earthquakes a day, on average. Seismicity spreads along a 30 km east–west elongated area, in the Po river alluvial plain, in the nearby of the cities Ferrara and Modena. Nine days after the first shock, another destructive thrust-type earthquake (ML 5.8) hit the area to the west, causing further damage and fatalities. Aftershocks following this second destructive event extended along the same east-westerly trend for further 20 km to the west, thus illuminating an area of about 50 km in length, on thewhole. After the first shock struck, on May 20th, a dense network of temporary seismic stations, in addition to the permanent ones, was deployed in the meizoseismal area, leading to a sensible improvement of the earthquake monitoring capability there. A combined dataset, including threecomponent seismic waveforms recorded by both permanent and temporary stations, has been analyzed in order to obtain an appropriate 1-D velocity model for earthquake location in the study area. Here we describe the main seismological characteristics of this seismic sequence and, relying on refined earthquakes location, we make inferences on the geometry of the thrust system responsible for the two strongest shocks.
Appears in Collections:04.07.07. Tectonics
Papers Published / Papers in press

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