In this report, we focus on a zone including the Sant'Agostino, San Carlo and Mirabello villages (west Ferrara Province), which were built along an abandoned reach of the Reno River and where liquefaction phenomena were particularly diffuse, with very intense local effects (Figure 1). The map in Figure 1 is based on original data collected in the days following the mainshock (and before the event of May 29, 2012) and locally integrated with data published by ISPRA [2012]. Similar maps have also been presented by other geological teams [e.g., Decanini et al. 2012, EMERGEO Working Group 2012], including of the western sector of the epicentral area and the manifestations that occurred during the second major earthquake. However, for the aims of this report that focuses on the Sant'Agostino, San Carlo and Mirabello case study, they will be not discussed. Based on stratigraphic reconstructions from boreholes and penetrometric tests, and on new direct measurements within numerous water wells, a preliminary conceptual hydrogeological model for the first ca. 30 m is also proposed for the investigated area. This hydrogeological model provides essential information for the liquefaction susceptibility discussed in this report. Grain-size analyses of ejected material collected a few days after the event in several locations were also carried out, and are here discussed in relation to the classical susceptibility criteria proposed by Tsuchida [1971]. In addition, a preliminary evaluation of the macroseismic intensity is performed based on the Environmental Seismic Intensity (ESI) scale.

Liquefaction phenomena along the palaeo-Reno River caused by the May 20, 2012 Emilia (Northern Italy) earthquake

CAPUTO, Riccardo;RAPTI, Dimitra
2012

Abstract

In this report, we focus on a zone including the Sant'Agostino, San Carlo and Mirabello villages (west Ferrara Province), which were built along an abandoned reach of the Reno River and where liquefaction phenomena were particularly diffuse, with very intense local effects (Figure 1). The map in Figure 1 is based on original data collected in the days following the mainshock (and before the event of May 29, 2012) and locally integrated with data published by ISPRA [2012]. Similar maps have also been presented by other geological teams [e.g., Decanini et al. 2012, EMERGEO Working Group 2012], including of the western sector of the epicentral area and the manifestations that occurred during the second major earthquake. However, for the aims of this report that focuses on the Sant'Agostino, San Carlo and Mirabello case study, they will be not discussed. Based on stratigraphic reconstructions from boreholes and penetrometric tests, and on new direct measurements within numerous water wells, a preliminary conceptual hydrogeological model for the first ca. 30 m is also proposed for the investigated area. This hydrogeological model provides essential information for the liquefaction susceptibility discussed in this report. Grain-size analyses of ejected material collected a few days after the event in several locations were also carried out, and are here discussed in relation to the classical susceptibility criteria proposed by Tsuchida [1971]. In addition, a preliminary evaluation of the macroseismic intensity is performed based on the Environmental Seismic Intensity (ESI) scale.
2012
Papathanassiou, G.; Caputo, Riccardo; Rapti, Dimitra
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1710713
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