An image of Mt. Vesuvius obtained by 2D seismic tomography

Zollo, Aldo; Gasparini, Paolo; Virieux, Jean; Biella, G.; Boschi, E.; Capuano, Paolo; Franco, R. de; Dell’Aversana, Paolo; Matteis, Raffaella De; Natale, Giuseppe De; Iannaccone, Giovanni; Guerra, I.; Meur, H. le; Mirabile, L.

doi:10.1016/s0377-0273(97)00063-2

Cited by 72 publications

(35 citation statements)

References 13 publications

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“…We can also assume that the fluid has a nearly constant temperature as a result of an adiabatic rise throughout most of its ascent, until it expands and cools just before reaching the surface (cf., Chiodini and Marini 1998), so that temperature-dependent variations in density and viscosity will be minimised. The local temperature gradient is ∼100°C/km, this value being consistent with the results of high-resolution seismic tomography (Zollo et al 1998) and mineral stabilities found within the ejected materials of the thermometamorphic contact aureole (Barberi and Leoni 1980;Belkin et al 1985;Fulignati et al 1998). Thus, thermophysical parameters for the aqueous fluids have been taken to be consistent with a temperature of 300°C (Chiodini et al 2001).…”

Section: Hydrodynamic Parameters At Somma-vesuviussupporting

confidence: 81%

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The dynamics of a double-cell hydrothermal system in triggering seismicity at Somma-Vesuvius: results from a high-resolution radon survey (revisited)

Cigolini

2010

Bull Volcanol

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Data collected at Somma-Vesuvius during the 1998-1999 radon surveys have been revisited and reinterpreted in light of recent geophysical and geochemical information. The duration of selected radon anomalies, together with the decay properties of radon, have been used to estimate the permeability and porosity of rocks of the deep hydrothermal system. The current local cyclic seismicity is explained by means of a double convective-cell model. Convective cells are separated by a low-permeability horizon located at about 2-2.5 km below sea level. Fluids convecting within the upper cells show temperatures ranging 300-350°C. Rock permeabilities in this sector are estimated on the order of 10 −12 m 2 , for porosities () of about 10 −5 typical of a brittle environment where fluid velocities may reach ∼800 m/day. Fluid temperatures within the lower cells may be as high as 400-450°C, consistent with supercritical regimes. The hydrodynamic parameters for these cells are lower, with permeability k∼10 −15 m 2 , and porosity ranging from 10 −6 to 10 −7 . Here, fluid motion toward the surface is controlled by the fracture network within a porous medium approaching brittle-ductile behaviour, and fluid velocities may reach ∼1,800 m/day. The low-permeability horizon is a layer where upper and lower convecting cells converge. In this region, fluids (convecting both at upper and lower levels) percolate through the wallrock and release their brines. Due to selfsealing processes, permeability within this horizon reaches critical values to keep the fluid pressure near lithostatic pressure (for k∼10 −18 m 2 ). Deep fluid pressure buildups precede the onset of hydrothermally induced earthquakes. Permeability distribution and rock strength do not exclude that the next eruption at Somma-Vesuvius could be preceded by a seismic crisis, eventually leading to a precursory phreatic explosion. The coupling of these mechanisms has the potential of inducing pervasive failure within rocks of the hydrothermal shell, and may be a prelude to a magmatic eruption. It is finally emphasised that the integrated analysis of seismic and geochemical data, including radon emissions, could be successfully used in testing temperature distributions and variations of porosity and permeability in active geothermal reservoirs.

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Section: Hydrodynamic Parameters At Somma-vesuviussupporting

confidence: 81%

“…High-resolution seismic tomography (Zollo et al 1998), indicate the existence of a very low-velocity zone at a depth of about 10-12 km below Mount Vesuvius. This discontinuity is likely to represent the top of a sill-like reservoir (Auger et al 2001;De Natale et al 2006).…”

Section: Introductionmentioning

confidence: 99%

The dynamics of a double-cell hydrothermal system in triggering seismicity at Somma-Vesuvius: results from a high-resolution radon survey (revisited)

Cigolini

2010

Bull Volcanol

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“…Recent geophysical data, obtained by high-resolution seismic tomography [Zollo et al, 1998], indicate the existence of a very low-velocity zone, marked by a transition in the velocity of seismic waves, at a depth of about 10 km below Mount Vesuvius. This discontinuity seems to represent the top of a magma chamber surrounded by a thermometamorphicmetasomatic shell that is partially affecting limestones and dolomites of the Miocene basement rocks [Barberi and Leoni, 1980].…”

Section: Introductionmentioning

confidence: 99%

High‐resolution radon monitoring and hydrodynamics at Mount Vesuvius

Cigolini¹,

Salierno²,

Gervino³

et al. 2001

Geophysical Research Letters

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“…Using active seismic sources means that scientists can "engineer" locations and origin times of seismic bursts. Successful active seismic studies have revealed the subsurface structures of several volcanoes, such as Italy's Vesuvius [Zollo et al, 1996[Zollo et al, , 1998] and Japan's Usu [Onizawa et al, 2007]. During Asama's active seismic experiment, scientists deployed temporary seismometers to obtain detailed data on the subsurface structure around the volcano's magma pathway (Figure 1).…”

Section: Active-source Seismic Experimentsmentioning

confidence: 99%

Active‐Source Seismic Experiment Confirms the Magma Pathway of Mount Asama, Japan

et al. 2009

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Large volcanic eruptions result from the ejection of magma transported from depth. How the magma is transported to the surface is one of the fundamental questions in understanding how a volcano works. A way to address this question is to explore the seismic structures of volcanoes. One volcano that is well surveyed and instrumented through a variety of global positioning system and seismic networks is Japan's Mount Asama. Because of this, scientists were able to conduct an active‐source seismic experiment on this volcano with the goal of mapping volcanic conduits (see Figure 1).

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An image of Mt. Vesuvius obtained by 2D seismic tomography

Cited by 72 publications

References 13 publications

The dynamics of a double-cell hydrothermal system in triggering seismicity at Somma-Vesuvius: results from a high-resolution radon survey (revisited)

The dynamics of a double-cell hydrothermal system in triggering seismicity at Somma-Vesuvius: results from a high-resolution radon survey (revisited)

High‐resolution radon monitoring and hydrodynamics at Mount Vesuvius

Active‐Source Seismic Experiment Confirms the Magma Pathway of Mount Asama, Japan

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