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Authors: Camassi, R.* 
Castelli, V.* 
Molin, D.* 
Bernardini, F.* 
Caracciolo, C. H.* 
Ercolani, E.* 
Postpischl, L.* 
Title: Materiali per un catalogo dei terremoti italiani: eventi sconosciuti, rivalutati o riscoperti
Journal: Quaderni di Geofisica 
Series/Report no.: 96 /(2011)
Publisher: INGV Istituto Nazionale di Geofisica e Vulcanologia
Issue Date: Dec-2011
Keywords: Parametric catalogue
Historical Seismology
Historical sources
Forgotten and unknown earthquakes
Subject Classification05. General::05.02. Data dissemination::05.02.02. Seismological data 
Abstract: The large-scale studies of historical seismology carried out in Italy and Europe in the last decades were mostly aimed at improving knowledge about earthquakes that were already listed in the extant parametric catalogues, rather than at identifying earthquakes that were not listed in them. From 1992 onwards, some of the authors of this study started to look for such “forgotten” earthquakes in different ways (by systematic surveys of serial historical sources, or by extensive investigation of local records in selected areas). More than 2000 pieces of evidence related to as many earthquakes not listed by any seismological compilations/catalogues were thus identified. In 2003 all resources were pooled in a common effort, meant to complete the revision of minor “known” earthquakes carried out by Molin et al. [2008] with a study of the most relevant “unknown” earthquakes identified so far. We present here the results of the analysis of 227 damaging earthquakes, 155 of which are “unknown” to the seismological tradition. Other 72 events were listed in the Postpischl [1985] catalogue, but not in newer parametric catalogues, no evidence of damage being available for them at the time: such evidence has now been found and, in 21 cases at least, it allows for a significant re-evaluation of macroseismic intensity.
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