Abstract
Abstract. This work shows the result of an electrical resistivity tomography (ERT) survey carried out for imaging and characterizing the shallow subsurface affected by the coseismic effects of the Mw = 6.1 Emilia-Romagna (northern Italy) earthquake that occurred on 20 May 2012. The most characteristic coseismic effects were ground failure, lateral spreading and liquefaction that occurred extensively along the paleo-Reno River in the urban areas of San Carlo and Mirabello (southwestern portion of Ferrara Province). In total, six electrical resistivity tomographies were performed and calibrated with surface geological surveys, exploratory boreholes and aerial photo interpretations. This was one of first applications of the electrical resistivity tomography method in investigating coseismic liquefaction.
Highlights
On 20 May 2012 a reverse-fault earthquake (Mw = 6.1; QRCMT, 2012) hit the Emilia-Romagna Region
In the urban areas of San Carlo and Mirabello, we investigated, by means of an electrical resistivity tomography (ERT) survey, the subsurface surrounding some of the major superficial manifestations of liquefaction
We indicated the uncertainty of the Fluvial Channel Unit (FCU)-Marshes Unit (MU) and MU-Pleistocene Alluvial Plain Unit (PAPU) boundaries using sectors T1 and T2, respectively
Summary
The hypocenter of the event was 6.3 km depth and the epicenter was localized at 44.889◦ N and 11.228◦ E, near the town of Finale Emilia (Fig. 1a). The coseismic effects associated with this event were observed in the nearby villages located within 20–30 km from the epicenter. The most impressive cases were those observed along the paleo-Reno River in the localities of San Carlo (Fig. 1b) and Mirabello (Fig. 1c). In the urban areas of San Carlo and Mirabello, we investigated, by means of an electrical resistivity tomography (ERT) survey, the subsurface surrounding some of the major superficial manifestations of liquefaction. The main aim of the ERT investigation was to provide rapid and valuable geological information (e.g., the shape, thickness and depth of the different geological units, depth of the water table, etc.) on the uppermost part of the subsoil affected by the coseismic liquefaction
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