Thermo-mechanical Modeling of Deformation Sources Driving Seismicity at Campi Flegrei Caldera
Description:
The ground deformation unrest at Campi Flegrei caldera has been going on for about two decades and has been paired with increased seismic magnitudes and rates since 2015. Recent geodetic and seismic measurements indicate a significant increase in uplift rates, providing insights into the spatial and temporal patterns of deformation. Magma transport effects on the measured deformation have been discussed as well as the presence of gas and fluid accumulation that builds the pressure up beneath the caprock. Geodynamic modeling allows gaining insight into the subsurface processes yielding the observed deformation and seismic activity. Geodynamic stress predictions can then be used to model the seismic response, thus coupling geodynamic and seismic models.
Joining the interpretations from seismic imaging, geodetic observations, and rock physics, we perform thermo-mechanical modeling of magma reservoirs using the Lithosphere and Mantle Evolution Model (LaMEM) code, which takes into account visco-elasto-plastic rheologies. Employing the existing structural information on the caldera, like a caprock layer and a hydrothermal system, the 3D thermo-mechanical numerical simulations of the magmatic system account for deep crustal magma migration from an ∼8 km-deep magma sill to a magma reservoir up to 5 km depth and suggest that this, combined with the effect of overlying rheologies and structure, may be the source of the deformation. The stress response of seismically active caldera rim faults has also been implemented. The simulations aim to understand the changes in the deformation pattern and amplitude as well as the stress field for future modeling of the seismic responses, thus contributing to the source and structure characterization.
Session: Data-driven and Computational Characterization of Non-earthquake Seismoacoustic Sources [Poster]
Type: Poster
Date: 4/16/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Chiara
Student Presenter: No
Invited Presentation:
Poster Number: 79
Authors
Chiara Nardoni Presenting Author Corresponding Author chiara.nardoni4@unibo.it University of Bologna |
Luca De Siena luca.desiena2@unibo.it University of Bologna |
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Thermo-mechanical Modeling of Deformation Sources Driving Seismicity at Campi Flegrei Caldera
Session
Data-driven and Computational Characterization of Non-earthquake Seismoacoustic Sources