Publication Date:
2017-04-04
Description:
The use of a hand-held thermal camera during
the 2002–2003 Stromboli effusive eruption proved essential
in tracking the development of flow field structures and in
measuring related eruption parameters, such as the number
of active vents and flow lengths. The steep underlying slope
on which the flow field was emplaced resulted in a
characteristic flow field morphology. This comprised a
proximal shield, where flow stacking and inflation caused
piling up of lava on the relatively flat ground of the vent
zone, that fed a medial–distal lava flow field. This zone was
characterized by the formation of lava tubes and tumuli
forming a complex network of tumuli and flows linked by
tubes. Most of the flow field was emplaced on extremely
steep slopes and this had two effects. It caused flows to
slide, as well as flow, and flow fronts to fail frequently,
persistent flow front crumbling resulted in the production of
an extensive debris field. Channel-fed flows were also
characterized by development of excavated debris levees in
this zone (Calvari et al. 2005). Collapse of lava flow fronts
and inflation of the upper proximal lava shield made
volume calculation very difficult. Comparison of the final
field volume with that expecta by integrating the lava
effusion rates through time suggests a loss of ~70% erupted
lava by flow front crumbling and accumulation as debris
flows below sea level. Derived relationships between
effusion rate, flow length, and number of active vents
showed systematic and correlated variations with time
where spreading of volume between numerous flows
caused an otherwise good correlation between effusion
rate, flow length to break down. Observations collected
during this eruption are useful in helping to understand lava
flow processes on steep slopes, as well as in interpreting old
lava–debris sequences found in other steep-sided volcanoes
subject to effusive activity.
Description:
Published
Description:
JCR Journal
Description:
reserved
Keywords:
Lava flow field
;
Morphology
;
Tumuli
;
Lava tubes
;
Effusion rate
;
Rheology
;
Stromboli volcano
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
1287165 bytes
Format:
application/pdf
