GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 Was the August 26, 1806 earthquake really the largest event in the Roman area ? A. Tertulliani, C. Castellano Isttuto Nazionale di Geofsica e Vulcanologia, Roma, Italy The August 26, 1806 earthquake, M w 5.6 and I 0 8 MCS, with epicenter in the Alban Hills region, is known as the largest one that occurred in the Roman area (CPTI15, Rovida et al., 2020; 2022). The shock occurred at 7:35 GMT, provoking damage in several localites, partcularly severe in the villages of Genzano, Rocca di Papa and Velletri. Some sources have even mentoned the death and injury of some people in Genzano and Rocca di Papa. The earthquake was felt in Naples and caused light damage in Rome. This is the summary of how the event is known so far in the catalogs (Guidoboni et al., 2018; Rovida et al., 2020). However, some unique features of this event intrigued us, and motvated us to undertake in-depth research. A dedicated investgaton showed that there was stll room for improvement in the knowledge about this earthquake, in partcular through the examinaton of archival documents, which had not been consulted by previous studies. The aim of this work is to present the path of revision and enrichment of the knowledge about the earthquake of August 26, 1806, from which a rather diferent picture has emerged from what has been known and present in the catalogs so far. References Guidoboni E., Ferrari G., Mariot D., Comastri A., Tarabusi G., Sgatoni G., Valensise G.; 2018: CFTI5Med, Catalogo dei Fort Terremot in Italia (461 a.C.-1997) e nell’area Mediterranea (760 a.C.-1500). Isttuto Nazionale di Geofsica e Vulcanologia (INGV). doi: htps://doi.org/ 10.6092/ingv.it-cfi5 Rovida, A., M. Locat, R. Camassi, B. Lolli, and P. Gasperini; 2020: The Italian earthquake catalogue CPTI15, Bull. Earthq. Eng. 18, 2953–2984, doi: 10.1007/s10518-020-00818-y Rovida A., Locat M., Camassi R., Lolli B., Gasperini P., Antonucci A.; 2022: Catalogo Parametrico dei Terremot Italiani (CPTI15), versione 4.0. Isttuto Nazionale di Geofsica e Vulcanologia (INGV) . htps://doi.org/10.13127/CPTI/CPTI15.4 Corresponding author: andrea.tertulliani@ingv.it