Abstract
<p>On May 20, 2012, a Ml 5.9 seismic event hit the Emilia Po Plain, triggering intense earthquake activity along a broad area of the Po Plain across the provinces of Modena, Ferrara, Rovigo and Mantova (Figure 1). Nine days later, on May 29, 2012, a Ml 5.8 event occurred roughly 10 km to the SW of the first main shock. These events caused widespread damage and resulted in 26 victims. The aftershock area extended over more than 50 km and was elongated in the WNW-ESE direction, and it included five major aftershocks with 5.1 ≤Ml ≤5.3, and more than 2000 minor events (Figure 1). In general, the seismic sequence was confined to the upper 10 km of the crust. Minor seismicity with depths ranging from 10 km to 30 km extended towards the southern sector of the epicentral area (ISIDe, http://iside.rm.ingv.it/). […]</p><br />
Highlights
On May 20, 2012, a ML 5.9 seismic event hit the EmiliaPo Plain, triggering intense earthquake activity along a broad area of the Po Plain across the provinces of Modena, Ferrara, Rovigo and Mantova (Figure 1)
Minor seismicity with depths ranging from 10 km to 30 km extended towards the southern sector of the epicentral area (ISIDe, http://iside.rm.ingv.it/)
The input data in the siE are grouped into two main categories: (i) existing base maps and other available datasets (e.g., INGV Kharita - Geoserver portal Project; CSI 1.1 - Castello et al [2006]; Bollettino Sismico Italiano; Italian Seismic Instrumental and Parametric Database - ISIDe; CPTI11 Rovida et al [2011]; DISS Working Group [2010]); (ii) geological coseismic surface effects collected during the post-earthquake survey by the EMERGEO teams
Summary
Po Plain, triggering intense earthquake activity along a broad area of the Po Plain across the provinces of Modena, Ferrara, Rovigo and Mantova (Figure 1). The thrust faulting focal mechanisms of the main shocks and the strongest aftershocks show fault planes with E-W, ENE-WSW, and WNW-ESE orientations [Pondrelli et al 2012, Scognamiglio et al 2012, this volume], compatible with the approximately N-S direction of the compression in the area [Montone et al 2012]. The most external structures, the active Ferrara and Mirandola thrusts and folds [Bigi et al 1992], were responsible for the Emilia Romagna 2012 earthquake sequence [Bignami et al 2012, Salvi et al 2012, this volume]. The recent activity of the Ferrara and Mirandola thrusts [DISS Working Group 2010] has been responsible for drainage diversions of the Po, Secchia, Panaro and Reno rivers [Burrato et al 2003, Burrato et al 2012, this volume]. The work in the field was organized according to EMERGEO procedures (http://emergeo.ingv.it/it/2012-06-11-07-35-01/887protocollo-operativo.html/), and it lasted for one month, with about 30 researchers and technicians of the Istituto
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