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Nespoli, Massimo; Belardinelli, Maria Elina; Calò, Marco; Tramelli, Anna; Bonafede, Maurizio

doi:10.1016/j.cageo.2022.105136

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…where ν is the drained isothermal Poisson's ratio, μ the rigidity, 1/ H is the poroelastic expansion and α s the thermal expansion coefficient of the solid matrix. The parameter e 0 is the "inclusion potency" (Nespoli et al 2021(Nespoli et al , 2022. In the case of a TPE inclusion, the displacement (Eshelby 1957 ) can be expressed as…”

Section: T P E S O L U T I O N Smentioning

confidence: 99%

“…Landry & Barbot 2019 ). Based on the distribution of equi v alent forces, the mechanical effects of a TPE inclusion with an arbitrary shape, located in a layered elastic half-space, can be modelled with the propagator method using the EFGRN / EFCMP code (Nespoli et al 2022 ).…”

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confidence: 99%

“…According to these authors, hydrothermal fluids were supplied by a deep magmatic chamber to a shallower volume, located above 3 km of depth, where most of the seismicity occurred during 1982-1984 unrest phase (Tramelli et al 2022 ). According to Lima et al ( 2021), Cal ò & Tramelli ( 2018, Nespoli et al ( 2022 ) and ref. therein, such a volume cyclically allows or prevents the rising of the magmatic fluids from depth, acting as a valve.…”

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confidence: 99%

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Thermo-poro-viscoelastic response of a disc-shaped inclusion

Nespoli

Belardinelli

Bonafede

2023

Geophysical Journal International

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Summary The study of deformation sources in volcanic and geothermal fields is a topic of great importance which generates a large debate in the scientific literature. A correct interpretation of the deformation sources acting in a volcanic context is crucial to distinguish between the mechanical effects due to the tectonic of the area, the intrusion of new magma and/or the mechanical response of rocks to temperature or pore pressure changes. In the recent literature, thermo-poro-elastic (TPE) inclusions were proposed as possible deformation sources which can explain seismicity and displacements even in absence of the emplacement of new magma. In fact, TPE inclusions allow us to compute the mechanical effects due to temperature and pore-pressure changes brought by the arrival of hot and pressurized fluids permeating a closed volume. In the present work we improve the modellization of such deformation sources to include the effects of visco-elasticity which should be expected in high temperature and fluid saturated rocks due to thermally activated and pressure-solution creep. The analytical thermo-poro-visco-elastic (TPVE) solutions for a disk-shaped inclusion embedded in a uniform visco-elastic medium are obtained through the correspondence principle. Our results can be useful to represent transient effects of both deformation and stress fields that can occur in both volcanic and geothermal areas, which would be difficult to explain otherwise. In fact, TPE inclusion models predict that an increase of uplift occurs simultaneously with an increase of stress, and vice-versa. Instead, we shall see that a TPVE inclusion can provide an increase of uplift even in presence of a strongly decreasing deviatoric stress. For this reason a TPVE inclusion can be suitable to represent a decrease in seismicity rate accompanied by an increase in surface uplift, as observed, for example, during the ’82-’84 unrest phase of Campi Flegrei in Italy.

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Section: T P E S O L U T I O N Smentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Thermo-poro-viscoelastic response of a disc-shaped inclusion

Nespoli

Belardinelli

Bonafede

2023

Geophysical Journal International

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“…The causes of the inflation of this source are still under debate. The role of a shallow hydrothermal system that characterises the area [12][13][14][15][16] makes the definition of this source very complex because it plays an active part in the inflation and deflation processes. The 1982-84 inflation needs a magmatic source to be justified, being the hydrothermal contribution insufficient to explain the recorded deformation.…”

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b value enlightens different rheological behaviour in Campi Flegrei caldera

Tramelli,

Convertito,

Godano

2024

Commun Earth Environ

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The Campi Flegrei caldera is one of the most dangerous volcanoes in the world and since 2005 it is in unrest. Here we evaluate the 3D tomography of the b value at the Campi Flegrei volcanic area revealing a very good correlation with the structure of the hydrothermal system involved in the bradiseismic phenomenon. More precisely, we observe the smallest b-values where we expect the higher stress/strain concentration, namely in the caprock, and for the deepest seismicity. Conversely, the largest b values are observed where the porosity of the medium allows the passage of the volcanic gases toward the surface. Values of b close to typical tectonic ones are observed where the presence of faulting structures is well documented.

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