Publication Date:
2017-04-04
Description:
We have carried out laboratory experiments to study the generation of granular flows on the slopes of pyroclastic
cones that are experiencing volcanic tremor or tectonic earthquakes. These experiments are inspired by the
occurrence of granular flows on the flanks of Mount Vesuvius during its 1944 eruption. Our laboratory model
consists of sand cones built around a vibrating tube which represents a volcanic conduit with erupting magma
inside. A video camera allows the study of the granular flow inception, movement and deposition. Although
the collapse of the entire cone is obtained at a specific resonance frequency, single granular flows can be
generated by all the vibration frequencies (1–16 Hz) and all the vibration amplitudes (0.5–1.5 mm) that our
experimental apparatus has allowed us to adopt.We believe that this is due to the fact that the energy threshold
to trigger the flows is small in value. Therefore, if this is true in nature aswell, shaken pyroclastic cones are always
potentially dangerous because they can easily generate flows that can strike the surrounding areas.
Description:
Published
Description:
83-89
Description:
3V. Dinamiche e scenari eruttivi
Description:
JCR Journal
Description:
restricted
Keywords:
slope instability
;
volcanic tremor
;
pyroclastic cones
;
granular flows
;
04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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