| Autor: |
Scotto di Uccio, Francesco, Lomax, Anthony, Natale, Jacopo, Muzellec, Titouan, Festa, Gaetano, Nazeri, Sahar, Convertito, Vincenzo, Bobbio, Antonella, Strumia, Claudio, Zollo, Aldo |
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Geophysical Research Letters; 6/28/2024, Vol. 51 Issue 12, p1-12, 12p |
| Abstrakt: |
In the past two decades, the central portion of Campi Flegrei caldera has experienced ground uplift up to 15 mm/month, with an increase of rate, magnitude and extent of the seismicity. In this work, we perform multi‐scale precise earthquake relocation of the 2014–2024 seismicity, mapping in detail activated fault zones. We relate the geometry, extent, and depth of these zones with up‐to‐date structural reconstructions of the caldera. The current seismicity is mainly driven by ground‐uplift‐induced stress concentration on pre‐existing, weaker fault zones, some of which identified for the first time. These structures are not only related to the inner caldera and dome resurgence but also to volcano‐tectonic events of the last 10 ka. The extent of imaged fault segments suggests they can accommodate ruptures up to a moment magnitude 5.1, significantly increasing seismic hazard in the area. Plain Language Summary: During the past 2 yrs, there has been a marked increase in ground uplift, number and size of earthquakes at Campi Flegrei caldera. This increase in activity has raised concerns among the population and public authorities about the impact of seismic activity on buildings and infrastructure in the area and about the best actions to undertake during the seismic emergency to reduce the risk. Additionally, the possibility of a future volcanic eruption is being considered, although currently geochemical and geophysical monitoring shows no unequivocal signs of precursory phenomena. In this work, we map the last decade of seismicity with a new technique providing high‐precision earthquake locations that allow us to unveil the currently activated fault zones of the inner caldera. The results show a near‐elliptical distribution of seismicity at the global scale of the caldera, which at a smaller scale delineates complex seismogenic structures. The size of imaged faults suggests that earthquakes up to a moment magnitude 5.1 can occur, significantly increasing seismic hazard in the area. Key Points: High‐precision location of 2014–2024 seismicity in Campi Flegrei depicts active fault zones with unprecedented detailSeismicity occurs along different volcano‐tectonic structures including the caldera inner ring fault zone and faults bounding the Solfatara craterA new structure has been recognized in the eastern sector of the caldera, hosting the largest magnitude event in the analyzed period [ABSTRACT FROM AUTHOR] |
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Complementary Index |
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