Seismicity and 3-D substructure at Somma–Vesuvius volcano: evidence for magma quenching☆

Natale, Giuseppe De; Troise, Claudia; Trigila, R.; Dolfi, D.; Chiarabba, C.

doi:10.1016/s0012-821x(04)00093-7

Cited by 53 publications

(41 citation statements)

References 26 publications

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“…Moreover, high velocity lateral contrast has already been indicated by 2D seismic tomography (ZOLLO et al, 1996), as well as by a more recent study by DE NATALE et al (2004) on the inversion of several seismic signals. The model obtained with the Layers procedure is shown in Figure 7, where the same horizontal E-W and N-S vertical cross sections displayed in Figure 6 are shown.…”

Section: Analyses Results and Discussionmentioning

confidence: 80%

“…Moreover, in the N-S section, there is also an uprising of the carbonate basement. It is surprising that this basement uprising shows the same shape as the high V P and V P /V S anomaly detected under the crater by DE NATALE et al (2004). Also, we should note here that the model was created in an automatic and non-subjective way, and the only initial constraint was the choice of density contrasts.…”

Section: Analyses Results and Discussionmentioning

confidence: 96%

“…Moreover, a joint inversion of P-wave and S-wave arrival times (from local earthquakes) and shot data collected during the TOMOVES 1994 and 1996 experiments showed the presence of a high V p and V p /V s anomaly that is located around the crater axis, between 0 km and 5 km in depth, which involves the volcano edifice and the carbonate basement. This anomaly has been interpreted in terms of magma quenching along the main conduit, because of the exsolution of magmatic volatiles (DE NATALE et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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3D Gravity Inversion by Growing Bodies and Shaping Layers at Mt. Vesuvius (Southern Italy)

Berrino

Camacho²

2008

Pure appl. geophys.

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To improve our knowledge of the structural pattern of Mt. Vesuvius and its magmatic system, which represents one of the three volcanoes located in the Neapolitan area (together with Campi Flegrei and Ischia; southern Italy), we analyze here the Bouguer gravity map that is already available through its interpretation by means of 2.5-dimensional modelling. We have carried out a three-dimensional interpretation using a new and original algorithm, known as 'Layers', that has been especially processed for this purpose. Layers works in an automatic and non-subjective way, and allows the definition of the structural settings in terms of several layers, each representing a specific geological formation. The same data are also interpreted in terms of isolated and shallow anomalous density bodies using a well tested algorithm known as 'Growth'. We focus our inversions on the Mt. Vesuvius volcano, while globally analyzing the entire Neapolitan area, in order to investigate the deep structures, and in particular the deep extended 'sill' that has been revealed by seismic tomography.The final models generally confirm the global setting of the area as outlined by previous investigations, mainly for the shape and depth of the carbonate basement below Mt. Vesuvius. The presence of lateral density contrasts inside the volcano edifice is also shown, which was only hypothesized in the 2.5-dimensional inversion. Moreover, the models allow us to note a high density body that rises from the top of the carbonate basement and further elongates above sea level. This probably represents an uprising of the same basement, which is just below the volcano and which coincides with the V P and V P /V S anomalies detected under the crater. The three-dimensional results also reveal that the two inversion methods provide very similar models, where the high density isolated body in the Growth model can be associated with the rising high density anomaly in the Layers model. Taking into account the density of these modelled bodies, we would also suggest that they represent solidified magma bodies, as suggested by other studies. Finally, we did not clearly detect any deep anomalous body that can be associated with the sill that was suggested by seismic tomography.

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Section: Analyses Results and Discussionmentioning

confidence: 80%

Section: Analyses Results and Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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3D Gravity Inversion by Growing Bodies and Shaping Layers at Mt. Vesuvius (Southern Italy)

Berrino

Camacho²

2008

Pure appl. geophys.

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“…A number of geophysical studies have been performed in the framework of a seismic tomography project, called TomoVes [Capuano et al, 2003]. The main results of this project are detailed images of the shallow volcanic structure and the Campanian Plain [Zollo et al, 1996;Di Stefano and Chiarabba, 2002;De Natale et al, 2004] and evidence for a 8 to 10 km deep midcrustal discontinuity associated with an extended molten or partially molten zone [Auger et al, 2001]. This low velocity zone (at least 400 km 2 ) was interpreted as a large scale series of sills below the volcano edifice, with magma interspersed in a solid matrix, extending toward East and in the direction of the near volcanic centre of Campi Flegrei, covering a volume larger than 500k 3 .…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Influence of topography on ground deformation at Mt. Vesuvius (Italy) by finite element modelling

Meo

Tammaro

Capuano

2008

International Journal of Non-Linear Mechanics

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Ground deformations are observed in connection with volcanic activity, and therefore geodetic monitoring can provide significant indication of changes of equilibrium conditions. The aim of this paper is to study the deformation of Mount Vesuvius (Italy) caused by overpressure sources at various depths, using a commercial (Ansys) 3D finite element code, in the framework of linear elastic isotropic material behaviour. Both homogenous and heterogeneous media with carbonate basement were analyzed to understand the influence of topography on the ground deformations. The topography of the Somma-Vesuvius was taken into account, using a digital terrain model, and the carbonate basement was schematically modelled by assuming two horizontal layers with different Young moduli. The presence of a strong deviation from axially symmetric pattern of the displacement field, and of small subsidence areas, was found. These characteristics are completely unknown from the simple Mogi model and by simplified topography model, as verified by ad hoc simulations. These preliminary results, showing areas of the volcanic edifice experiencing high deformation, can improve the determination of the sources of deformations, i.e. the most relevant problem in the volcano monitoring. Moreover, the knowledge of the deformation pattern, including the topography effects, can provide significant indications to optimize the A c c e p t e d m a n u s c r i p t location of sensors and the characteristics needed to design an efficient and reliable geodetic monitoring network able to detect shallow intrusion events.

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“…Mesozoic carbonates with a thickness of ∼8 km that dip westward from the adjacent Apenninic belt have been detected at a depth of 2-3 km in the Mt. Somma-Vesuvius area [35][36][37]. Both the high Ca-and Mg contents of Type II MI can be explained by assimilation of dolomite at depth, either by trapping small dolomite crystals in the MI or incorporating dolomite into the parental magma before MI trapping, but stable isotopic data are required to confirm this hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Klébesz¹,

Bodnar

Vivo

et al. 2012

Open Geosciences

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Nodules (coarse-grain "plutonic" rocks) were collected from the ca. 20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma-Vesuvius, Italy. The nodules are classified as monzonite-monzogabbro based on their modal composition. The nodules have porphyrogranular texture, and consist of An-rich plagioclase, K-feldspar, clinopyroxene (ferroan-diopside), mica (phlogopite-biotite) ± olivine and amphibole. Aggregates of irregular intergrowths of mostly alkali feldspar and plagioclase, along with mica, Fe-Ti-oxides and clinopyroxene, in the nodules are interpreted as crystallized melt pockets. Crystallized silicate melt inclusions (MI) are common in the nodules, especially in clinopyroxenes. Two types of MI have been identified. Type I consists of mica, Fe-Ti-oxides and/or dark green spinel, clinopyroxene, feldspar and a vapor bubble. Volatiles (CO 2 , H 2 O) could not be detected in the vapor bubbles by Raman spectroscopy. Type II inclusions are generally lighter in color and contain subhedral feldspar and/or glass and several opaque phases, most of which are confirmed to be oxide minerals by SEM analysis. Some of the opaque-appearing phases that are below the surface may be tiny vapor bubbles. The two types of MI have different chemical compositions. Type I MI are classified as phono-tephrite -tephri-phonolite -basaltic trachy-andesite, while Type II MI have basaltic composition. The petrography and MI geochemistry led us to conclude that the nodules represent samples of the crystal mush zone in the active plumbing system of Mt. Somma-Vesuvius that were entrained into the upwelling magma during the PB-Sarno eruption.

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Seismicity and 3-D substructure at Somma–Vesuvius volcano: evidence for magma quenching☆

Cited by 53 publications

References 26 publications

3D Gravity Inversion by Growing Bodies and Shaping Layers at Mt. Vesuvius (Southern Italy)

3D Gravity Inversion by Growing Bodies and Shaping Layers at Mt. Vesuvius (Southern Italy)

Influence of topography on ground deformation at Mt. Vesuvius (Italy) by finite element modelling

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

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