Publication Date:
2017-04-04
Description:
The 2001 Etna eruption was characterized by a complex temporal evolution with the
opening of seven eruptive fissures, each feeding different lava flows. This work
describes a method adopted to obtain the three-dimensional geometry of the whole lava
flow field and for the reconstruction, based on topographic data, of the temporal evolution
of the largest lava flow emitted from a vent located at 2100 m a.s.l. Preeruption and
posteruption Digital Elevation Models (DEM) were extracted from vector contour maps.
Comparison of the two DEMs and analysis of posteruption orthophotos allowed us to
estimate flow area, thickness, and bulk volume. Additionally, the two-dimensional
temporal evolution of the 2100 flow was precisely reconstructed by means of maps
compiled during the eruption. These data, together with estimates of flow thickness,
allowed us to evaluate emitted lava volumes and in turn the average volumetric flow rates
The analysis performed in this paper provided, a total lava bulk volume of 40.1 106 m3
for the whole lava flow field, most of which emitted from the 2100 vent (21.4 106 m3).
The derived effusion rate trend shows an initial period of waxing flow followed by a
longer period of waning flow. This is in agreement not only with the few available effusion
rate measurements performed during the eruption, but also with the theoretical model
of Wadge (1981) for the temporal variation in discharge during the tapping of a
pressurized source
Description:
Published
Description:
F02029
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
JCR Journal
Description:
reserved
Keywords:
Etna
;
2001 eruption
;
three-dimensional mapping
;
lava volume
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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