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|Authors: ||Armienti, P.*|
|Title: ||Factors Controlling the Transition from Strombolian Explosions to Lava Fountaining at Mount Etna: a Mass- and Energy-Constrained Model from the 2013 Paroxysmal Activity|
|Editors: ||Cocina, O.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia|
Nicotra, E.; Catania University, Italy
|Issue Date: ||2014|
|Publisher: ||MISCELLANEA INGV|
|Abstract: ||A multidisciplinary approach based on image analysis of seismic signals, thermodynamics and mass
balance has been here adopted to find quantitative relations between magma degassing at depth and the
transition from Strombolian activity to lava fountaining for a set of paroxysmal eruptions occurred at Mt.
Etna volcano in March-April 2013.
The image processing of the seismogram allows handling of a huge quantity of data, providing a tool
for the simple extraction of numerical values. We propose a model based on the consideration that gas
outbursts are a vehicle of the transfer of energy tracked by seismic signals during the uprising of magma.
Thus, the simple assumption of a relation of proportionality between the energy of the seismic signal and the
mass of exsolved gas allows us to interpret transitions of the eruptive style as due to the amount of
undegassed magma recharging the feeding system. Changes of this recharge rate in the range of 1:20 control
the evolution of the eruptive process, and are evidence for the limited area section of the feeding conduit.
Being this transition process observed in volcanic regions worldwide, the model can be successfully applied
to other basaltic volcanoes. Furthermore, the image analysis technique may be applied to other contexts in
which the interpretation of seismograms is necessary.|
|Appears in Collections:||04.08.99. General or miscellaneous|
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