Changes in the VLP seismic source during the 2007 Stromboli eruption

Giudicepietro, Flora; D’Auria, Luca; Martini, M.; Caputo, Teresa; Peluso, R.; Cesare, W. De; Orazi, M.; Scarpato, Giovanni

doi:10.1016/j.jvolgeores.2008.11.008

Cited by 29 publications

(22 citation statements)

References 9 publications

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“…This change in VLP source position is also confirmed by the analysis of 11 broad-band seismic stations 14 and was also observed during the 2003 eruption 17 . The drift of the VLP seismicity appears to follow the drainage of the magma during the effusive eruption.…”

Section: Resultssupporting

confidence: 75%

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Volcano seismicity and ground deformation unveil the gravity-driven magma discharge dynamics of a volcanic eruption

et al. 2015

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Effusive eruptions are explained as the mechanism by which volcanoes restore the equilibrium perturbed by magma rising in a chamber deep in the crust. Seismic, ground deformation and topographic measurements are compared with effusion rate during the 2007 Stromboli eruption, drawing an eruptive scenario that shifts our attention from the interior of the crust to the surface. The eruption is modelled as a gravity-driven drainage of magma stored in the volcanic edifice with a minor contribution of magma supplied at a steady rate from a deep reservoir. Here we show that the discharge rate can be predicted by the contraction of the volcano edifice and that the very-long-period seismicity migrates downwards, tracking the residual volume of magma in the shallow reservoir. Gravity-driven magma discharge dynamics explain the initially high discharge rates observed during eruptive crises and greatly influence our ability to predict the evolution of effusive eruptions.

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Section: Resultssupporting

confidence: 75%

“…1). However, the VLP seismicity commonly associated with the explosive activity was uninterrupted 14 . Despite the transition to effusive activity and the absence of Strombolian explosions, the VLP volcanic seismicity remained intense 13,14 .…”

Section: Resultsmentioning

confidence: 99%

Volcano seismicity and ground deformation unveil the gravity-driven magma discharge dynamics of a volcanic eruption

et al. 2015

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“…At Stromboli, the position of the source of VLP events usually shows a remarkable stability [ Martini et al , ; Giudicepietro et al , ]; however, a significant displacement was recorded at the onset of the eruption on 27 February 2007 and between April and May 2007 [ Martini et al , ; Giudicepietro et al , ]. On 27 February, we observed a shallowing of the source depth of about 100 m in a few hours, associated with the drainage of magma from the volcanic conduit at the onset of the effusive activity [ Giudicepietro et al , ]. Between April and May 2007 instead, the VLP source showed a location shift from NE to SW, associated with a marked increase in the occurrence rate, passing from 10 to 20 events per hour up to 80 events per hour [ Giudicepietro et al , ].…”

Section: Resultsmentioning

confidence: 66%

“…On 27 February, we observed a shallowing of the source depth of about 100 m in a few hours, associated with the drainage of magma from the volcanic conduit at the onset of the effusive activity [ Giudicepietro et al , ]. Between April and May 2007 instead, the VLP source showed a location shift from NE to SW, associated with a marked increase in the occurrence rate, passing from 10 to 20 events per hour up to 80 events per hour [ Giudicepietro et al , ].…”

Section: Resultsmentioning

confidence: 99%

Reactivation of Stromboli's summit craters at the end of the 2007 effusive eruption detected by thermal surveys and seismicity

et al. 2015

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This work arises from the field observations made during the civil protection emergency period connected to the 2007 Stromboli eruption. We observed changes in the shallow feeding system of the volcano to which we give a volcanological interpretation and the relative implications. Here we describe the processes that occurred in the upper feeding system from the end of the 2007 effusive eruption on 3 April to the renewal of the strombolian explosive activity at the summit craters (30 June), interpreted using multidisciplinary data. We used thermal camera data collected both from helicopter and from a fixed station at 400 m to retrieve the evolving summit crater activity. These data, compared with seismic signals and published geochemical records, allowed us to detail the shifting of the degassing activity within the crater terrace from NE to SW, occurred between 15 and 25 April 2007 prior to the resumption of the strombolian activity. In particular, from mid‐April, a gradual SW displacement in the maximum apparent temperatures was recorded at the vents within the summit craters, together with a change in the very long period location and confirmed by variations in geochemical indicators (CO2/SO2 plume ratios and CO2 fluxes) from literature. The shallow feeding system experienced a major readjustment after the end of the effusive activity, determining variations in the pressure leakage of the source, slowly deepening and shifting toward SW. All these data, together with the framework supplied by previous structural surveys, allowed us to propose that the compaction of debris accumulated in the uppermost conduit by inward crater collapses, occurred in early March, produced the observed anomalies. At Stromboli, major morphology changes, taking place in the following years, were anticipated by these small and apparently minor processes occurred in the upper feeding system. Other studies are relating similar changes to modifications of the eruptive activity also at other open‐conduit volcanoes, so we believe that it may be important to have a constant monitoring of these phenomena in order to better understand their shallow feeding systems.

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“…By the end of January 2007, however, the explosion frequency significantly increased, ultimately leading (on 27 February) to the opening of an eruptive fissure on the upper slope of the Sciara del Fuoco, and thus the onset of the 2007 effusive eruption [ Barberi et al , 2009]. During the effusive phase, no ordinary Strombolian activity was visible at the summit craters; the persistent occurrence of very‐long‐period seismicity [ Giudicepietro et al , 2009] and of discontinuous (weak) ash emissions, however, were all suggestive that Strombolian activity persisted deep in the volcano's conduit [ Marchetti and Ripepe , 2005]. This relatively quiet scenario was suddenly (and only very temporarily) interrupted by a paroxysmal explosion on 15 March 2007 [ Aiuppa et al , 2010a, 2010b]; from a volcanological point of view, and for the purposes of this paper, this event may be viewed as one of the most powerful in the last 110 years, after the 1930 [ Rittmann , 1931] and the 5 April 2003 [ Calvari et al , 2005; Pistolesi et al , 2008] paroxysms [ Métrich et al , 2010].…”

Section: The 2004–2009 Eruptive Activity Of Strombolimentioning

confidence: 99%

Leachate analyses of volcanic ashes from Stromboli volcano: A proxy for the volcanic gas plume composition?

et al. 2011

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[1] Many volcanoes show a change in chemical composition of the gas phase prior to periods of eruptive activity. Fine-grained tephra erupted from active vents and transported through volcanic plumes can adsorb, and therefore rapidly scavenge, volatile elements such as sulfur, halogens, and metal species in the form of soluble salts adhering to ash surfaces. Analysis of such water-soluble surface materials is a suitable supplement for remote monitoring of volcanic gases at inaccessible volcanoes. In this work, ash samples of the 2004 to 2009 eruptive activity of Stromboli volcano were sampled, leached, and analyzed for major and trace elements. Data analysis and interpretation was focused on determining the relationship between chemical composition of water-soluble components adhering to volcanic ash and the volcano's activity state. First results show significant temporal variations in ash leachate compositions, reflecting changes in the eruptive style of the volcano. In particular, we reveal that ash leachates S/F and Mg/Na ratios showed marked increases prior to a large-scale explosion on 15

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Changes in the VLP seismic source during the 2007 Stromboli eruption

Cited by 29 publications

References 9 publications

Volcano seismicity and ground deformation unveil the gravity-driven magma discharge dynamics of a volcanic eruption

Volcano seismicity and ground deformation unveil the gravity-driven magma discharge dynamics of a volcanic eruption

Reactivation of Stromboli's summit craters at the end of the 2007 effusive eruption detected by thermal surveys and seismicity

Leachate analyses of volcanic ashes from Stromboli volcano: A proxy for the volcanic gas plume composition?

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