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Journal Article

Weak Crust Owing Past Magmatic Intrusions Beneath Campi Flegrei Identified: The Engine for Bradyseismic Movements?

Authors

Buono,  Gianmarco
External Organizations;

Maccaferri,  Francesco
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Pappalardo,  Lucia
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Tramelli,  Anna
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Caliro,  Stefano
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Chiodini,  Giovanni
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Pinel,  Virginie
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/persons/resource/rivalta

Rivalta,  E.
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Spagnuolo,  Elena
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Trasatti,  Elisa
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Di Vito,  Mauro Antonio
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Citation

Buono, G., Maccaferri, F., Pappalardo, L., Tramelli, A., Caliro, S., Chiodini, G., Pinel, V., Rivalta, E., Spagnuolo, E., Trasatti, E., Di Vito, M. A. (2025): Weak Crust Owing Past Magmatic Intrusions Beneath Campi Flegrei Identified: The Engine for Bradyseismic Movements? - AGU Advances, 6, 2, e2024AV001611.
https://doi.org/10.1029/2024AV001611


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5034856
Abstract
Calderas often experience extended periods of unrest that are challenging to relate to a magmatic or hydrothermal origin, making it crucial to assemble a clear picture of these dynamics. Since 2005, Campi Flegrei caldera (Italy) has experienced accelerating ground uplift, seismicity rates, and degassing. Here we conduct petrological and 4D X-ray microtomography investigations on cored rocks from a ∼3 km deep geothermal well located near the center of caldera, complemented by 3D high-resolution seismic tomography. At a depth of ∼2.5–3.0 km we identify the transition to a weak tuff layer likely to trap magmatic fluids. Simulations of magma pathways indicate that stresses generated by caldera unloading may have arrested at the limestone/tuff transition past ascending dykes, which deformed, heated, and released magmatic fluids, deteriorating the surrounding rocks. This weak layer may play a crucial role in building up overpressure, causing deformation and seismicity, thus influencing the dynamics of recent unrests, and possible future magma ascent episodes.