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

The analysis of the seismic survey performed at the San Carlo site shows that the whole local sedimentary column is cut by a set of faults/fractures. The observed medium-depth geometric features might have had a role in the development of surface fracturing that occurred in the surveyed area after the May 20, 2012, event. In the near future, only a few geological pieces of evidence of coseismic surface phenomena will be preserved, and the San Carlo fracture system should be better investigated, to understand whether it should be considered as a mere site-effect due to the 4-m-high river bank surficial morphology, or whether other possible conditioning factors might exist.