Publication Date:
2021-05-12
Description:
Here we report the first measurements of gas masses released during a rare period of strombolian activity at
the Bocca Nuova crater, Mt. Etna, Sicily. UV camera data acquired for 195 events over an ≈27 minute period
(27th July 2012) indicate erupted SO2 masses ranging from ≈0.1 to ≈14 kg per event, with corresponding
total gas masses of ≈0.1 to 74 kg. Thus, the activity was characterised by more frequent and smaller events
than typically associated with strombolian activity on volcanoes such as Stromboli. Events releasing larger
measured gas masses were followed by relatively long repose periods before the following burst, a feature not
previously reported on from gas measurement data. If we assume that gas transport within the magma can be
represented by a train of rising gas pockets or slugs, then the high frequency of events indicates that these
slugs must have been in close proximity. In this case the longer repose durations associated with the larger
slugs would be consistent with interactions between adjacent slugs leading to coalescence, a process expedited
close to the surface by rapid slug expansion. We apply basic modelling considerations to the measured gas
masses in order to investigate potential slug characteristics governing the observed activity.We also cross correlated
the acquired gas fluxes with contemporaneously obtained seismic data but found no relationship between
the series in line with the mild form of manifest explosivity.
Description:
Published
Description:
103–111
Description:
3V. Dinamiche e scenari eruttivi
Description:
JCR Journal
Description:
open
Keywords:
Mild strombolian activity
;
Ultra-violet imaging
;
Volcanic gas measurements
;
Slug dynamics
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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