Key points are not available for this paper at this time.
Campi Flegrei caldera is experiencing, during the last two decades, an uplift with a typical bell-shaped pattern, which is progressively more intense (40 cm in 2021-2023) and is accompanied by increasing seismicity and fumarolic activity. We analyzed Multi Temporal DInSAR measurements, GNSS and seismic data to detect and investigate a geodetic anomaly that clearly manifested in 2021. This anomaly is located where the larger earthquakes occurred, covers an area of about 1.3 km2 and shows, in comparison to the surrounding areas, a maximum uplift deficit of about 9 cm between 2021 and 2023. We interpreted this anomaly as a zone of crustal weakness, due to faults, hydrothermal fluid circulation, and lithological heterogeneities caused by lava domes south of Solfatara crater (Mt. Olibano - Accademia area), which reacts to the powerful inflation of a penny-shaped deformation source located in the caldera center at a depth of approximately 3800 m.
Giudicepietro et al. (Thu,) studied this question.