3-D density model of Mt. Etna Volcano (Southern Italy)

Schiavone, D.; Loddo, M.

doi:10.1016/j.jvolgeores.2007.04.016

Cited by 44 publications

(28 citation statements)

References 42 publications

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“…These are characterized by linear and arcuate shapes; the most evident magnetic feature is the presence of a lower magnetized area located above Val Calanna where a deeply hydrotermalized dike swarm crops out16. This magnetic feature overlays a part of the well-known high velocity (Vp) and density body inferred by seismic and gravity data1718, which is poorly magnetized.…”

Section: Resultsmentioning

confidence: 95%

Volcanic conduit migration over a basement landslide at Mount Etna (Italy)

Nicolosi

Caracciolo

Branca

et al. 2014

Sci Rep

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The flanks of volcanoes may slide in response to the loading of the edifice on a weak basement, magma push, and/or to tectonic stress. However, examples of stratovolcanoes emplaced on active landslides are lacking and the possible effects on the volcano dynamics unknown. Here, we use aeromagnetic data to construct a three-dimensional model of the clay-rich basement of Etna volcano (Italy). We provide evidence for a large stratovolcano growing on a pre-existing basement landslide and show that the eastern Etna flank, which slides toward the sea irrespective of volcanic activity, moves coherently with the underlying landslide. The filling of the landslide depression by lava flows through time allows the formation of a stiffness barrier, which is responsible for the long-term migration of the magma pathways from the coast to the present-day Etna summit. These unexpected results provide a new interpretation clue on the causes of the volcanic instability processes and of the mechanisms of deflection and migration of volcanic conduits.

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Section: Resultsmentioning

confidence: 95%

Volcanic conduit migration over a basement landslide at Mount Etna (Italy)

Nicolosi

Caracciolo

Branca

et al. 2014

Sci Rep

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“…It is related to the magma injection and withdrawal in a region recognized to be a preferential pathway of magma rising and a favored intermediate accumulation storage at a depth of 3–5 km b.s.l. in proximity of the western border of the high-density and high-velocity body detected by gravity prospecting33 and seismic tomography34. In the South Rift area (from IF to MS gravity stations; Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Fault zone porosity is expected to change during co-seismic processes due to the formation of new cracks, changes from ineffective (or isolated) to effective (or connected) porosity (rearrangement of the interconnection chains between existing voids), grain size comminution, and gouge evolution42. Assuming average values of basaltic rock density33 ρ 0 (2400–2600 kg/m 3 ) and reasonable porosity change values Δϕ (0.003–0.006)42, a negative density change Δρ = ρ 0 Δϕ of about 7–15 kg/m 3 is estimated. Considering such a density decrease within the volume releasing most of the seismic energy after the 2002–2003 eruption, the expected gravity change matches quite well the observed variations along the profile in 2004 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Capturing the fingerprint of Etna volcano activity in gravity and satellite radar data

Negro

Currenti

Solaro

et al. 2013

Sci Rep

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Long-term and high temporal resolution gravity and deformation data move us toward a better understanding of the behavior of Mt Etna during the June 1995 – December 2011 period in which the volcano exhibited magma charging phases, flank eruptions and summit crater activity. Monthly repeated gravity measurements were coupled with deformation time series using the Differential Synthetic Aperture Radar Interferometry (DInSAR) technique on two sequences of interferograms from ERS/ENVISAT and COSMO-SkyMed satellites. Combining spatiotemporal gravity and DInSAR observations provides the signature of three underlying processes at Etna: (i) magma accumulation in intermediate storage zones, (ii) magmatic intrusions at shallow depth in the South Rift area, and (iii) the seaward sliding of the volcano's eastern flank. Here we demonstrate the strength of the complementary gravity and DInSAR analysis in discerning among different processes and, thus, in detecting deep magma uprising in months to years before the onset of a new Etna eruption.

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“…1) was also recognized by Rollin et al (2000) and Schiavone and Loddo (2007). The time-integrated spatial distribution of the seismicity revealed that the HVB is mainly aseismic.…”

Section: Introductionmentioning

confidence: 85%

Cognate xenoliths in Mt. Etna lavas: witnesses of the high-velocity body beneath the volcano

et al. 2013

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Various xenoliths have been found in lavas of the 1763 ("La Montagnola"), 2001, and 2002-03 eruptions at Mt. Etna whose petrographic evidence and mineral chemistry exclude a mantle origin and clearly point to a cognate nature. Consequently, cognate xenoliths might represent a proxy to infer the nature of the high-velocity body (HVB) imaged beneath the volcano by seismic tomography. Petrography allows us to group the cognate xenoliths as follows: i) gabbros with amphibole and amphibole-bearing mela-gabbros, ii) olivine-bearing leuco-gabbros, iii) leuco-gabbros with amphibole, and iv) Plg-rich leuco gabbros. Geobarometry estimates the crystallization pressure of the cognate xenoliths between 1.9 and 4.1 kbar. The bulk density of the cognate xenoliths varies from 2.6 to 3.0 g/cm 3 . P wave velocities (V P ), calculated in relation to xenolith density, range from 4.9 to 6.1 km/s. The integration of mineralogical, compositional, geobarometric data, and density-dependent V P with recent literature data on 3D V P seismic tomography enabled us to formulate the first hypothesis about the nature of the HVB which, in the depth range of 3-13 km b.s.l., is likely made of intrusive gabbroic rocks. These are believed to have formed at the "solidification front", a marginal zone that encompasses a deep region (>5 km b.s.l.) of Mt. Etna's plumbing system, within which magma crystallization takes place. The intrusive rocks were afterwards fragmented and transported as cognate xenoliths by the volatile-rich and fast-ascending magmas of the 1763 "La Montagnola", 2001 and 2002-03 eruptions.

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3-D density model of Mt. Etna Volcano (Southern Italy)

Cited by 44 publications

References 42 publications

Volcanic conduit migration over a basement landslide at Mount Etna (Italy)

Volcanic conduit migration over a basement landslide at Mount Etna (Italy)

Capturing the fingerprint of Etna volcano activity in gravity and satellite radar data

Cognate xenoliths in Mt. Etna lavas: witnesses of the high-velocity body beneath the volcano

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