A new, largely revised and updated version of the Catalogue of Strong Earthquakes in Italy and in the Mediterranean area, termed CFTI5Med, was released in 2018 by Guidoboni et al. (https://doi.org/10.6092/ingv.it-cfti5). The Catalogue collects the results of over three decades of research in historical seismology in Italy and in the Mediterranean area.What makes CFTI5Med different from all other earthquake catalogues is that its database does not only contain parametric data and macroseismic intensities assigned to individual localities, but also textual descriptions of the territorial impact of each investigated earthquake sequence on both the built and the natural environment. For every investigated earthquake sequence, CFTI5Med supplies also the relevant bibliography in an organised form.Instrumental catalogues generally supply one record per earthquake. In contrast, the earthquake effects described by historical sources often refer to the combined effect of multiple shocks belonging to a sequence. For this reason, CFTI5Med presents the data organised "by earthquake sequence", after aggregating shocks that appear reasonably clustered in both time and space.For each investigated earthquake sequence we provide three different types of parametric information:1) the full parameters of each shock of the sequence;2) the intensity (according to the MCS scale) assigned to individual localities where each shock caused damage, or was felt, or was reported not felt;3) a list of effects on the natural environment associated with a single shock (whenever possible) or with the entire sequence, subdivided into 32 different categories and assigned to individual localities.In addition, we supply the following synthetic summaries (in plain text form):• descriptions of the territorial impact and temporal evolution of the entire earthquake sequence;• descriptions of the effects on the built and natural environment for each individual locality.

Supplement to: Guidoboni, Emanuela; Ferrari, Graziano; Tarabusi, Gabriele; Sgattoni, Giulia; Comastri, Alberto; Mariotti, Dante; Ciuccarelli, Cecilia; Bianchi, Maria Giovanna; Valensise, Gianluca (2019): CFTI5Med, the new release of the catalogue of strong earthquakes in Italy and in the Mediterranean area. Scientific Data, 6(1), 80