Publikationsdatum:
2012-02-03
Beschreibung:
Geophysical Research Abstracts,
Vol. 10, EGU2008-A-03790, 2008
EGU General Assembly 2008
© Author(s) 2008
Correlation between seismic and volcanic activity: A
tale of three eruptive episodes at Mount Etna (Italy) in
November 2006
B. Behncke, S. Falsaperla, E. Pecora
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania; Piazza Roma, 2; 95123
Catania, Italy
Three eruptive episodes of the Southeast Crater at the summit of Mount Etna in
November 2006 were exceptionally well documented by visual, seismic and thermal
monitoring. In terms of volcanic activity, the three paroxysms showed marked
differences among each other. The first one (16 November) was a strongly explosive
event, with vigorous Strombolian activity and ash emission from multiple vents, lava
emission, and phreatomagmatic explosions generating pyroclastic density currents. In
contrast, the second episode (19 November) was a rather weakly explosive event, with
mild Strombolian activity but more voluminous lava emission. Finally, the third paroxysm
(24 November) was a moderately explosive event, with intermittent lava fountaining
and generation of a tephra column as well as lava emission and pyroclastic flows.
Data recorded by a thermal monitoring camera clearly document the different phases
of each paroxysm, although weather clouds occasionally hampered thermal monitoring.
The images show a rapid onset of the volcanic activity, which reached a peak
in eruptive (and thermal) intensity, and then decreased gradually. The analysis of seismic
activity highlights a wide range of different types of signals, reflecting remarkable
complexities in the dynamics of the eruptive events. The different explosive intensities
are well reflected in the volcanic tremor amplitude, although the three episodes show
common features, such as a maximum in tremor amplitude during their first hour, and
a number of strong explosive events during the waning phases of each paroxysm. A
neat correlation between typologies of seismic signals and eruptive styles and intensities
can be established from the data. However, the strong phreatomagmatic explosions
and pyroclastic density currents on 16 and 24 November did not yield any distinguish
Beschreibung:
Published
Beschreibung:
Vienna, Austria
Beschreibung:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Beschreibung:
open
Schlagwort(e):
Seismic and volcanic activity
;
Etna 2006
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
;
05. General::05.06. Methods::05.06.99. General or miscellaneous
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
Poster session
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