Publication Date:
2017-04-04
Description:
Geophysical (tilt, seismic tremor and gravity signals),
geochemical (crater SO2 flux) and infrared satellite
measurements are presented and discussed to track the
temporal evolution of the lava fountain episode occurring at
Mt Etna volcano on 10 April 2011. The multi-disciplinary
approach provides insight into a gas-rich magma source
trapped in a shallow storage zone inside the volcano edifice.
This generated the fast ascending gas-magma dispersed flow
feeding the lava fountain and causing the depressurization of
a deeper magma storage. Satellite thermal data allowed
estimation of the amount of erupted lava, which, summed to
the tephra volume, yielded a total volume of erupted products
of about 1 106 m3. Thanks to the daylight occurrence of this
eruptive episode, the SO2 emission rate was also estimated,
showing a degassing cycle reaching a peak of 15,000 Mg d 1
with a mean daily value of 5,700 Mg d 1. The SO2 data
from the previous fountain episode on 17–18 February to
10 April 2011, yielded a cumulative degassed magma volume
of about 10.5 106 m3, indicating a ratio of roughly 10:1
between degassed and erupted volumes. This volumetric
balance, differently from those previously estimated during
different styles of volcanic activities with long-term (years)
recharging periods and middle-term (weeks to months)
effusive eruptions, points toward the predominant role
played by the gas phase in generating and driving this lava
fountain episode.
Description:
Published
Description:
L24307
Description:
3.6. Fisica del vulcanismo
Description:
JCR Journal
Description:
restricted
Keywords:
Mt. Etna
;
lava fountain
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
