The eastern Alps earthquake catalogue (1977-2022)

The National Institute of Oceanography and Applied Geophysics (OGS) manages the Monitoring System for NE Italy (SMINO), which performs the institutional tasks of monitoring and researching seismic activity in NE Italy (Bragato et al., 2021), for civil protection, and includes collaboration activities concerning alert notifications, emergency plans, and voluntary work involvement (Sandron et al., 2016, 2020). SMINO, an infrastructure of national importance, consists of the NE Italy Seismic Network, OX network code (OGS, 2016), a strong motion network, and a geodetic monitoring network. The first stations of the seismometric network were originally deployed in May 1977, one year after the strong earthquake, which heavily damaged central Friuli, NE Italy (Rebez et al., 2018; Slejko, 2018).
Real-time data are exchanged with national and international networks in neighbouring countries, and information on seismic events is disseminated to the public through a dedicated web portal (https://terremoti.ogs.it).
Since 2010, the monitoring network managed by OGS has reached a stable configuration, in terms of the number of stations installed, the homogenisation and modernisation of the installed instruments and, ultimately, in terms of a data processing system that has reached a well-established level of robustness (Moratto and Sandron, 2015; Sandron et al., 2023). Since 2015, a seismic bulletin has, also, been made available and it includes the calculation of the local magnitude on the analysis of the event waveform amplitude in addition to the historical duration magnitude, based on the readings of the earthquake duration in real-time. In a recent work of recalibration of the duration magnitude on the local magnitude, also including past reviews of more energetic earthquakes based on the estimate of the local magnitude of the Trieste station [equipped with an original Wood Anderson (WA) seismograph (Sandron et al., 2015)], a new regression relation (between the duration in seconds and the local magnitude) was created and, here, used to obtain a new homogeneous catalogue from 1977 to 2022 (Sandron et al., 2023).
Aim of the present work is to describe and make available a comprehensive data set of locations and magnitudes of events, which occurred in the eastern Alps in the last 45 years. The present paper can be considered an addendum to the paper by Sandron et al. (2023) and, for this reason, it is presented in the form of short note.