Publication Date:
2020-02-24
Description:
We investigated the eruptive episodes that occurred
at Etna volcano on 15 November 2011 and 18 March 2012
using different types of data. We present novel data from two
recently installed strainmeters that recorded unique signals
during the lava fountain phases of these events. The strainmeter
data, integrated with those recorded by the magnetic network,
and with satellite and ground thermal data, allowed us to follow
the path of a gas-rich magma batch from the source inside the
volcano to the surface and atmosphere. The amplitude ratio of
the volumetric strain changes constrained the storage depth of
the magma feeding the lava fountains above 1.5 km below sea
level. Magnetic data revealed an attempted shallow lateral
intrusion, whereas ground and satellite thermal data furnished
a quantification of the total erupted volumes of ∼2.2×106m3
for the 15 November event and ∼3.0×106m3 for the 18 March
event. Despite different durations of the explosive and effusive
phases of the two lava fountain events, the total erupted volume
was quite similar, suggesting the emptying of a shallow storage
system displaying a steady behaviour.
Description:
Published
Description:
article 690
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
JCR Journal
Description:
restricted
Keywords:
Etna volcano
;
lava fountain
;
strain
;
magnetic data
;
thermal data
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
