Publication Date:
2017-04-04
Description:
Since the second half of the 1990s, the eruptive activity of Mount Etna has provided
evidence that both explosive and effusive eruptions display periodic variations in discharge
and eruption style. In this work, a multiparametric approach, consisting of comparing
volcanological, geophysical, and geochemical data, was applied to explore the volcano's
dynamics during 2009–2011. In particular, temporal and/or spatial variations of seismicity
(volcano-tectonic earthquakes, volcanic tremor, and long-period and very long period
events), ground deformation (GPS and tiltmeter data), and geochemistry (SO2 flux, CO2
flux, CO2/SO2 ratio) were studied to understand the volcanic activity, as well as to
investigate magma movement in both deep and shallow portions of the plumbing system,
feeding the 2011 eruptive period. After the volcano deflation, accompanying the onset of the
2008–2009 eruption, a new recharging phase began in August 2008. This new volcanic
cycle evolved from an initial recharge phase of the intermediate-shallower plumbing system
and inflation, followed by (i) accelerated displacement in the volcano's eastern flank since
April 2009 and (ii) renewal of summit volcanic activity during the second half of 2010,
culminating in 2011 in a cyclic eruptive behavior with 18 lava fountains from New
Southeast Crater (NSEC). Furthermore, supported by the geochemical data, the inversion of
ground deformation GPS data and the locations of the tremor sources are used here to
constrain both the area and the depth range of magma degassing, allowing reconstructing the
intermediate and shallow storage zones feeding the 2011 cyclic fountaining NSEC activity.
Description:
Published
Description:
3519–3539
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
JCR Journal
Description:
restricted
Keywords:
Mt Etna
;
seismology
;
ground deformation
;
geochemistry
;
volcanology
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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