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Time-series analysis of fissure-fed multi-vent activity: a snapshot from the July 2014 eruption of Etna volcano (Italy)
Citation key SpinaTaddeucciCannataSciottoDelBelloScarlatoKueppersAndronicoPriviteraRicciPenaFernandezSesterhennDingwell2017
Author Spina, L. and Taddeucci, J. and Cannata, A. and Sciotto, M. and Del Bello, E. and Scarlato, P. and Kueppers, U. and Andronico, D. and Privitera, E. and Ricci, T. and Pena-Fernandez, J. and Sesterhenn, J. and Dingwell, D. B.
Pages 51
Year 2017
ISSN 1432-0819
DOI 10.1007/s00445-017-1132-x
Journal Bulletin of Volcanology
Volume 79
Number 7
Month Jun
Abstract On 5 July 2014, an eruptive fissure opened on the eastern flank of Etna volcano (Italy) at textasciitilde3.000 m a.s.l. Strombolian activity and lava effusion occurred simultaneously at two neighbouring vents. In the following weeks, eruptive activity led to the build-up of two cones, tens of meters high, here named Crater N and Crater S. To characterize the short-term (days) dynamics of this multi-vent system, we performed a multi-parametric investigation by means of a dense instrumental network. The experimental setup, deployed on July 15-16th at ca. 300 m from the eruption site, comprised two broadband seismometers and three microphones as well as high speed video and thermal cameras. Thermal analyses enabled us to characterize the style of eruptive activity at each vent. In particular, explosive activity at Crater N featured higher thermal amplitudes and a lower explosion frequency than at Crater S. Several episodes of switching between puffing and Strombolian activity were noted at Crater S through both visual observation and thermal data; oppositely, Crater N exhibited a quasi-periodic activity. The quantification of the eruptive style of each vent enabled us to infer the geometry of the eruptive system: a branched conduit, prone to rapid changes of gas flux accommodated at the most inclined conduit (i.e. Crater S). Accordingly, we were able to correctly interpret acoustic data and thereby extend the characterization of this two-vent system.
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