AUTOMATIC SEISMIC EVENT DETECTIONS IN THE AEOLIAN ARCHIPELAGO (SOUTHERN TYRRHENIAN SEA, ITALY)
The Aeolian volcanic archipelago (southern Tyrrhenian Sea, Italy) formed as a result of the subduction of the African plate beneath the European plate, leading to the development of a back-arc basin that also hosts different volcanic activity. This geological framework results in a complex tectonic setting including strike-slip, compressional and extensional regimes. Volcanism and seismicity in this region are mainly controlled by the Aeolian-Tindari-Letojani (NNW–SSE) and the Sisifo-Alicudi (WNW–ESE) fault systems, which generate seismicity down to ~40 km of depth.
In 2025, two relevant seismic sequences occurred: 1) SSE of Alicudi (the westernmost island of the Archipelago) in February, and 2) SSW of Salina to the east in June. Using the continuous records from the temporary broadband seismic network of the CAVEAT project (Central-southern Aeolian islands: Volcanism and tEAring in the Tyrrhenian subduction system) and from the permanent network operated by INGV, we enhanced the detection of small magnitude events since all stations provide a better azimuthal coverage. We applied machine learning techniques for automatic phase picking and phase association, and for the location, we tested different velocity models to better constrain the depth distribution and source mechanisms of the events.
The increase in the number of detected seismic events allows a more detailed characterization of seismicity across the Aeolian archipelago allowing us to discriminate between different tectonic structures for a better understanding of the shallow processes occurring in this complex geological setting.
This study is funded by the INGV Pianeta Dinamico project 2023-2025 CAVEAT (grant no. CUP D53J19000170001) supported by the Italian Ministry of University and Research “Fondo finalizzato al rilancio degli investimenti delle amministrazioni centrali dello Stato e allo sviluppo del Paese”, legge 145/2018, in collaboration with UNAM and the University of Geneva.
The CAVEAT Team: M. Lupi (3), M. Palano (4), A. Antonioli (1), S. Bagh (1), I. Cabrera Perez (3), C. Castellano (1), F. Criscuoli (1), L. Cucci (1), P. De Gori (1), D. Famiani (1), A. Gattuso (5), A. Govoni (1), E.A. Jiwani‐Brown (3), A. Marchetti (1), J. Porras- Loria (3), T. Ricci (1), A. Scaltrito (6), L. Scognamiglio (1), A. Ursino (6), L. Valoroso (1), G. Ventura (1)