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The 15 March 2007 explosive crisis at Stromboli volcano, Italy: Assessing physical parameters through a multidisciplinary approach

Pistolesi, M.
Delle Donne, D.
Rosi, M.
Ripepe, M.
Published in Journal of geophysical research. 2011, vol. 116, no. B12
Abstract Basaltic volcanoes are dominated by lava emission and mild explosive activity. Nevertheless, many basaltic systems exhibit, from time to time, poorly documented and little-understood violent explosions. A short-lived, multiblast explosive crisis (paroxysmal explosion) occurred on 15 March 2007 during an effusive eruptive crisis at Stromboli (Italy). The explosive crisis, which started at 20:38:14 UT, had a total duration of ∼5 min. The combined use of multiparametric data collected by the permanent instrumental networks (seismic, acoustic, and thermal records) and a field survey carried out immediately after the event enabled us to constrain the eruptive dynamics and quantify physical parameters. The eruption consisted of three major pulses: In the first, lithic blocks and ash were ejected at speeds of 100–155 m/s and 130–210 m/s, respectively. The high solid load of the eruptive jet resulted in the partial collapse of the column with the formation of a small-volume pyroclastic density current. The second, 12 s long pulse emitted 2.2–2.7 × 107 kg of tephra (mass discharge rate = 1.9–2.3 × 106 kg/s), forming a 3 km high convective plume, dispersing tephra up to the west coast, and a dilute density current with limited dispersal downslope of the craters. A final, 30 s long phase formed a scoria flow with a volume of 1.5–1.7 × 104 m3 (mass discharge rate = 5.9–6.7 × 105 kg/s), a total runout of ∼200 m, and a velocity of 45 m/s. The total gas volume involved in the explosion was 1.3–1.9 × 104 m3 with an initial overpressure of 7.9 ± 0.4 MPa. We compared the 15 March 2007 event with historical paroxysms, in particular with that of 5 April 2003, which was remarkably similar.
Keywords StromboliBallistic ejectionGeophysical monitoringParoxysmPyroclastic flowTephra deposit
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Research group Physical Volcanology and Geological Risk
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PISTOLESI, M. et al. The 15 March 2007 explosive crisis at Stromboli volcano, Italy: Assessing physical parameters through a multidisciplinary approach. In: Journal of geophysical research, 2011, vol. 116, n° B12. doi: 10.1029/2011JB008527 https://archive-ouverte.unige.ch/unige:40717

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Deposited on : 2014-10-06

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