GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 Improving the quality of the seismic catalogue by updating outdated or preliminary reference studies: case histories V. Castelli 1 , S. Baranello 1 , F. Bernardini 1 , R. Camassi 1 , C.H. Caracciolo 1 , C. Castellano 2 , E. Ercolani 1 , S. Filosa 2 , Laura Graziani 2 , A. Maramai 2 , S. Paolini 3 , A. Rossi 2, A. Tertulliani 2 1 INGV Istituto Nazionale di Geofisica e Vulcanologia , Bologna, Italy 2 INGV Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy 3 ENEA Ente per le nuove tecnologie, l’energia e l’ambiente, Roma, Italy The Parametric Catalogue of Italian Earthquakes CPTI15 [Rovida et al., 2022] includes 241 earthquakes whose epicentral parameters are based on studies marked AMGNDT95 [Archivio Macrosismico GNDT, 1995]. These are preliminary (or, in some cases, extremely basic) studies, that were carried out in the early 1990s by the GNDT/CNR (Gruppo Nazionale per la Difesa dai Terremoti of the Consiglio Nazionale delle Ricerche of Italy) in the frame of the “Hazard Project”, whose aim was making available the basic data required for preparing an updated hazard model, as quickly as possible and in the form of a parametric catalogue. Those AMGNDT95 studies that we define as “preliminary” derived the epicentral parameters of each studied earthquake from a data base reconstructed starting from the bibliographic references of the PFG catalogue [Postpischl, 1985] and going back, wherever possible to their original sources, according to a procedure called “Analysis Through Catalogues” [Stucchi, 1993]. The AMGNDT95 studies that we define as ‘extremely basic’, limited themselves to parameterizing the information provided by the bibliographic references of the PFG catalogue, i.e. in most cases the Baratta [1901] earthquake compilation or the seismological bulletins of the 19th-20th centuries. The AMGNDT95 studies remained unpublished and on paper only until the year 2017, when they were digitized within the framework of Annex B2 of the DPC-INGV 2016-2017 Convention, and made public via the ASMI platform [Rovida et al., 2017]. In the framework of the following triennial DPC-INGV Convention, an operation was then launched to update AMGNDT95 studies with revision priorities established according to the relevance of each earthquakes and to the potential margins for improving knowledge on each of them. As the operation was under way, the revision was extended to another 8 damaging earthquakes whose parameters in the CPTI15 catalogue were derived straight from the PFG