GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 Earthquake Early Warning system: case of the 2022 Marche sequence S. Carannante 1 , C. Ladina 2 1 Istituto Nazionale di Geofisica e Vulcanologia, Milano 2 Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Nazionale Terremoti In recent years, the implementation of an early warning system (Earthquake Early Warning, EEW) has become widespread in many countries of the world and in some cases they have been made operational. The study of the vulnerability of urban areas in relation to seismic events has led to the development of different approaches, methodologies and combinations of new experiences. All these systems have in common the purpose of providing rapid notification of the potential harmful effects of a seismic event through the processing of data from monitoring networks in the areas where the source of the event is located or in the areas surrounding the selected targets. Furthermore, the systems, in general, have the purpose of detecting, locating and estimating the magnitude and the shaking parameters of an event starting from the analysis of a few seconds from the first arrival (P wave) recorded at the stations. The correct functioning of an early warning system can actually ensure more effective management of a seismic emergency from the first seconds after the occurrence of a strong earthquake, allowing rapid actions to reduce seismic exposure and risk. The present work aims to show the functioning and performance of a particular integrated earthquake early warning system s, currently widespread and tested in some critical areas of Italy: the software PRESTo (PRobabilistic and Evolutionary early warning SysTem, Iannacone et al., 2010; Satriano et al., 2011). After an accurate calibration of the configuration parameters (Carannante et al., 2022), the software is currently acquiring in real time at the Milano office. During its acquisition period, the system was able to record the events of the Marche offshore sequence (November 2022), allowing us to test the software's performances in a real early warning framework. Since the beginning of the sequence, the PRESTo software has triggered 70 probable seismic events. The analyzes are conducted by comparing the catalogue of the National Institute of Geophysics and Volcanology ( http://terremoti.ingv.it/ ), considered as reference, with the events triggered by the system.