Publication Date:
2022-08-18
Description:
Between 13 December 2020 and 21 February 2022, Etna volcano produced a sequence of
66 paroxysmal explosive eruptions, with Strombolian activity at the summit craters climaxing in
lava fountains and eruption columns extending several kilometers above the craters, accompanied
by minor and short-lasting lava flows from the crater rim. We selected three of these episodes that
occurred within a short space of time, between 13 December 2020 and 12 March 2021, of different
magnitude (i.e., erupted volume) and intensity (i.e., mass eruption rate or instantaneous eruption
rate), and analyzed them from a multidisciplinary perspective. The aim was to gain insights into
those parameters that mostly reveal the eruptive process for hazard assessment purposes. The multidisciplinary
data consist of calibrated visible images, thermal images, seismic and infrasound data,
ground deformation detected from the strainmeters, as well as satellite SEVIRI images. From these
data, we obtained the timing of each paroxysmal event, the erupted volume in terms of tephra and
lava flows, and the corresponding deflation of the source region, together with the development of
the lava fountains and eruption columns with time. The results enabled determining that the smallest
episode was that of 13 December 2020, which comprised three distinctive pulses but did not
produce an eruptive column detectable from either monitoring cameras or satellites. The 28 February
2021 episode was remarkable for the short amount of time required to reach the climax, and was
the most intense, whereas the 12 March 2021 event showed the longest duration but with an intensity
between that of the previous two. Our results show that these three paroxysmal events display
a typical trend, with the first event also being the smallest in terms of both erupted volume and
intensity, the second being the most intense, and the third the one of greatest magnitude but less
intense than the second. This is coherent with the end of the first paroxysmal phase on 1 April 2021,
which was followed by 48 days of eruptive pause before starting again. In this context, the end of
the paroxysmal phase was anticipated by a more effusive episode, thus heralding a temporary decline
in the gas content within the feeding magma batch.
Description:
This research was funded by the Project FIRST-ForecastIng eRuptive activity at Stromboli
volcano: Timing, eruptive style, size, intensity, and duration; INGV-Progetto Strategico Dipartimento
Vulcani 2019 (Delibera n. 144/2020). A.C. thanks the CHANCE project, II Edition, Università
degli Studi di Catania (principal investigator A.C.) and the grant PIACERI, 2020-22 programme
(PAROSSISMA project, code 22722132140; principal investigator Marco Viccaro). A.I. thanks the
IMPACT project—A Multidisciplinary Insight on the Kinematics and Dynamics of Magmatic Processes
at Mt. Etna Aimed at Identifying Rrecursor Phenomena and Developing Early Warning Systems,
funded by INGV-Progetto Strategico Dipartimento Vulcani 2019 (Delibera n. 144/2020). S.S.
thanks the ‘e-shape’ project, which receives funding from the European Union’s Horizon 2020 research
and innovation programme under grant agreement 820852.
Description:
Published
Description:
4006
Description:
5V. Processi eruttivi e post-eruttivi
Description:
JCR Journal
Keywords:
Etna Volcano
;
Lava Fountains
;
volcanic plume
;
multidisciplinary monitoring systems
;
eruptive column
;
04.08. Volcanology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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