Coeval Uplift and Subsidence Reveal Magma Recharging Near Rome (Italy)

Uplift and subsidence alternate throughout the life cycle of a volcano mirroring magma accumulation, migration and/or gas pressurization, and magma cooling or depressurization, respectively. The unusual occurrence of coeval inflation and deflation is difficult to reconcile with the recharging or coo...

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Published in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2018-05, Vol.19 (5), p.1484-1498
Main Authors: Trasatti, E., Marra, F., Polcari, M., Etiope, G., Ciotoli, G., Darrah, T. H., Tedesco, D., Stramondo, S., Florindo, F., Ventura, G.
Format: Article
Language:English
Subjects:
Calderas
Colli Albani
Cooling
Deformation
Faults
gas isotope geochemistry
Helium
Hydrologic processes
InSAR
Lava
Life cycle
Magma
Magma chambers
Modelling
numerical modeling
Subsidence
Synthetic aperture radar interferometry
Uplift
volcano geodesy
Volcanoes
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Summary:Uplift and subsidence alternate throughout the life cycle of a volcano mirroring magma accumulation, migration and/or gas pressurization, and magma cooling or depressurization, respectively. The unusual occurrence of coeval inflation and deflation is difficult to reconcile with the recharging or cooling of a single magma chamber, or hydrological processes. Here we show a persistent flank uplift and central subsidence at Colli Albani volcano near Rome (Italy), by mapping about 20 years of deformation by InSAR data. The magmatic helium signature increases in correspondence with N‐S faults along the western slope of Colli Albani, which are therefore interpreted as deep‐seated structures directly or indirectly connected with an underlying magma reservoir. Deformation modeling shows that these faults are pathways for fresh magma intrusion, whereas a residual magma is cooling below the deflating caldera. Therefore, magma recharge at depth is controlled by major faults along which the vents of the most recent activity (
ISSN:1525-2027
1525-2027
DOI:10.1029/2017GC007303