Assessment of a shallow magmatic system: the 1888–90 eruption, Vulcano Island, Italy

Clocchiatti, R.; Moro, A. Del; Gioncada, Anna; Joron, Jean Louis; Mosbah, M.; Pinarelli, L.; Sbrana, Alessandro

doi:10.1007/bf00302828

Cited by 99 publications

(81 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Sample GS91.42C was taken from a breadcrust bomb of the 1880 eruption of Vulcano and exhibits latitic composition and a Porphyritic Index;22%. A detailed account of compositional and volcanologic data has been reported by Armienti et al (1990) and Clocchiatti et al (1994). Following the classification of Wholetz and Heiken (1992) based on the total amount of vesicles, all of the samples are scoriaceous lava or scoriae.…”

Section: Description Of Natural Samples Related To Fast Degassingmentioning

confidence: 97%

Coupled degassing and crystallization: experimental study at continuous pressure drop, with application to volcanic bombs

Simakin

Armienti²,

Epel'baum

1999

Bulletin of Volcanology

View full text Add to dashboard Cite

Experiments on degassing of water-saturated granite melts with a pressure drop from 100 and 450 MPa to 40 and 120 MPa, respectively, at temperatures close to feldspar liquidus (750-700 degrees C), were carried out to determine the modality of water exsolution and vesicle formation at the liquidus temperature. Pressure-drop rates as small as approximately 100 bar/day were used. Uniform space distributions of bubbles of exsolved water were obtained with starting glass containing a small fraction (approximate to 0.5 vol.%) of trapped air bubbles. Volume crystallization of feldspar was observed in degassed melts supplied with seeds. Bubble size distributions (BSD) measured in granite glasses after degassing are presented. Data on vesicle characteristics (number, radius, area, elongation) were acquired on images digitized with standard software, while the reconstruction of size distributions was performed with the Schwartz-Saltikov "unfolding" procedure. Bubble size distributions of size classes in the range 5-1000 mu m were acquired with proper magnification and satisfactory statistical reliability of determined number densities. The BSDs of the experimental samples are compared with the results of measurements of rapidly degassed products of Mt. Etna and Vulcano Island. Many particular features of the bubble nucleation and growth can be distinguished in an individual BSD. However, the general BSD of the whole data set, including natural ones, can be relatively well described with linear regression in bilogarithmic coordinates. The slope of this regression is approximately 2.8 +/- 0.1. This dependence is in striking contrast with distributions theoretically predicted with classical nucleation models based on homogeneous nucleation of vesicles. The theoretical distribution requires the occurrence of strong maxima that are not observed in our experimental and natural samples, thus arguing for heterogeneous nucleation mechanisms

show abstract

Section: Description Of Natural Samples Related To Fast Degassingmentioning

confidence: 97%

Coupled degassing and crystallization: experimental study at continuous pressure drop, with application to volcanic bombs

Simakin

Armienti²,

Epel'baum

1999

Bulletin of Volcanology

View full text Add to dashboard Cite

show abstract

“…A magmatic body was identified at depth of about 2-3 km below La Fossa crater by geophysical and geochemical studies (Fig. 1;FERRUCCI et al, 1991;CLOCCHIATTI et al, 1994). La Fossa is a calc-alkaline volcanic cone, with an altitude of about 400 m above sea level (a.s.l.)…”

Section: Introductionmentioning

confidence: 99%

Multiparametric Approach in Investigating Volcano-Hydrothermal Systems: the Case Study of Vulcano (Aeolian Islands, Italy)

Cannata

Diliberto

Alparone

et al. 2011

Pure Appl. Geophys.

View full text Add to dashboard Cite

Seismic activity, ground deformation, and soil and fumarole temperatures acquired during 2004-2007 at Vulcano (Aeolian Islands) are analysed and the time relations among the different time series are discussed. Changes in temperature of fumarolic gases took place during four ''anomalous'' periods () at the same time as an increasing number of volcano-seismic events. In particular, the temperatures at high temperature vents and at steam heated soil ranged in time from 180 to 440°C and from 20 to 90°C, respectively. The maximum daily number of volcano-seismic events was 57, reached during the second anomalous period. This seismicity, characterised by focal depth generally lower than 1 km below sea level (b.s.l.) and composed of different kinds of events associated to both resonance and shear failure processes, is related to the shallow dynamics of the hydrothermal system. During the analysed period, very few volcano-tectonic earthquakes took place and tilt recordings showed no sharp or important changes. In light of such observations, the increases in both temperature and volcano-seismic events number were associated to increases in the release of gas from a deep and stable magma body, without magma intrusions within the shallow hydrothermal system. Indeed, a greater release of gas from depth leads to increased fluid circulation, that can promote increases in volcano-seismic events number by both fracturing processes and resonance and vibration in cracks and conduits. The different trends observed in the measured geochemical and geophysical series during the anomalous periods can be due to either time changes in the medium permeability or a changing speed of gas release from a deep magma body. Finally, all the observed variations, together with the changing temporal distribution of the different seismic event kinds, suggest that the hydrothermal system at Vulcano can be considered unsteady and dynamic.

show abstract

“…1). A magmatic body was identified by geophysical and geochemical studies at a depth of about 2-3 km below La Fossa crater (Ferrucci et al 1991;Clocchiatti et al 1994;Nuccio and Paonita 2001). Recently, Blanco-Montenegro et al (2006) presented a magnetic model of the subsurface structure of Vulcano island based on high-resolution aeromagnetic data.…”

Section: Introductionmentioning

confidence: 99%

Time-space variation of volcano-seismic events at La Fossa (Vulcano, Aeolian Islands, Italy): new insights into seismic sources in a hydrothermal system

et al. 2010

View full text Add to dashboard Cite

We investigated the relationship between volcano-seismic events, recorded at La Fossa crater of Vulcano (Aeolian Islands, Italy) during [2004][2005][2006], and the dynamics of the hydrothermal system. During the period of study, three episodes of increasing numbers of volcano-seismic events took place at the same time as geothermal and geochemical anomalies were observed. These geothermal and geochemical anomalies have been interpreted as resulting from an increasing deep magmatic component of the hydrothermal fluids. Three classes of seismic events (long period, high frequency and monochromatic events), characterised by different spectral content and various similarity of the waveforms, have been recognised. These events, clustered mainly below La Fossa crater area at depths of 0.5-1.1 km b.s.l., were space-distributed according to the classes. Based on their features, we can infer that such events at Vulcano are related to two different source mechanisms: (1) fracturing processes of rocks and (2) resonance of cracks (or conduits) filled with hydrothermal fluid. In the light of these source mechanisms, the increase in the number of events, at the same time as geochemical and geothermal anomalies were observed, was interpreted as the result of an increasing magmatic component of the hydrothermal fluids, implying an increase of their flux. Indeed, such variation caused an increase of both the pore pressure within the rocks of the volcanic system and the amount of ascending fluids. Increased pore pressures gave rise to fracturing processes, while the increased fluid flux favoured resonance and vibration processes in cracks and conduits. Finally, a gradual temporal variation of the waveform of the hybrid events (one of the subclasses of long period events) was observed, likely caused by heating and drying of the hydrothermal system.

show abstract

Assessment of a shallow magmatic system: the 1888–90 eruption, Vulcano Island, Italy

Cited by 99 publications

References 23 publications

Coupled degassing and crystallization: experimental study at continuous pressure drop, with application to volcanic bombs

Coupled degassing and crystallization: experimental study at continuous pressure drop, with application to volcanic bombs

Multiparametric Approach in Investigating Volcano-Hydrothermal Systems: the Case Study of Vulcano (Aeolian Islands, Italy)

Time-space variation of volcano-seismic events at La Fossa (Vulcano, Aeolian Islands, Italy): new insights into seismic sources in a hydrothermal system

Contact Info

Product

Resources

About