Searching for the effects of the May-June 2012 Emilia seismic sequence (northern Italy): medium-depth deformation structures at the periphery of the epicentral area

摘要: In 2012, a seismic sequence occurred in the lowlands of Emilia-Romagna Region (northern Italy), between borders Modena, Ferrara and Bologna Provinces. It consisted seven mainshocks (5.9 > Ml 5) that were recorded May 20 29, 2012 [INGV 2012a] 2,200 minor earthquakes 2012b]. An interferometric analysis [Bignami et al. Salvi this volume] highlighted three main deformation areas, each which was 12 km wide (from S to N) 10 long an ESE-WNW E-W direction, thus affecting area about 600 km2 (Figure 1). Field aerial geological surveys numerous surficial effects, such as: (i) sediment liquefaction [Crespellani 2012]; (ii) localized ground fissures resembling faulting [Fioravante Giretti 2012] 2); (iii) groundwater levels rising up 400 cm above local level phreatic wells during (lower values observed confined aquifers); (iv) dormancy previously known sinkholes [Borgatti 2010, Cremonini 2010a, references therein]. Some surface phenomena as coseismic effects (1570) Argenta (1624) [Boschi 1995, Galli 2000], together with early water Po River Stellata section. […]