Publication Date:
2022-01-03
Description:
A main challenge in open conduit volcanoes is to detect and interpret the ultra-small strain
(〈10–6) associated with minor but critical eruptions such as the lava fountains. Two years
after the flank eruption of December 2018, Etna generated a violent and spectacular
eruptive sequence of lava fountains. There were 23 episodes from December 13, 2020 to
March 31, 2021, 17 of which in the brief period 16 February to 31 March with an intensified
occurrence rate. The high-precision borehole dilatometer network recorded significant
strain changes in the forerunning phase of December 2020 accompanying the final magma
migration at the shallower levels, and also during the single lava fountains and during the
entire sequence. The source modeling provided further information on the shallow
plumbing system. Moreover, the strain signals also gave useful information both on the
explosive efficiency of the lava fountains sequence and the estimate of erupted volume.
The high precision borehole dilatometers confirm to be strategic and very useful tool, also
to detect and interpret ultra-small strain changes associated with explosive eruptions, such
as lava fountains, in open conduit volcanoes.
Description:
Published
Description:
740505
Description:
5V. Processi eruttivi e post-eruttivi
Description:
JCR Journal
Keywords:
etna volcano
;
lava fountains
;
volcano monitoring
;
borehole strainmeters
;
eruption modeling
;
Magma Migration at Shallower Levels and Lava Fountains Sequence as Revealed by Borehole Dilatometers on Etna Volcano
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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