Report on Stromboli (Italy) — 29 December-4 January 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 29 December-4 January 2011
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2010. Report on Stromboli (Italy). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 29 December-4 January 2011. Smithsonian Institution and US Geological Survey.
38.789°N, 15.213°E; summit elev. 924 m
All times are local (unless otherwise noted)
INGV-CT reported that on 19 December a major explosion from a vent in the southern part of Stromboli's crater terrace occurred at 0956, coincident with explosive sequence consisting of three discrete seismic events. During the last few days of December the "S1" vent produced frequent explosions of greater intensity than those of the preceding days. Jets rose 200 m above the crater terrace. On 27 December, the frequency of the explosions rose to 11-14 per hour. The "S1" vent is immediately next to the "S" vent, the source of the 19 December explosion.
Geologic Background. Spectacular incandescent nighttime explosions at this volcano have long attracted visitors to the "Lighthouse of the Mediterranean." Stromboli, the NE-most of the Aeolian Islands, has lent its name to the frequent mild explosive activity that has characterized its eruptions throughout much of historical time. The small island is the emergent summit of a volcano that grew in two main eruptive cycles, the last of which formed the western portion of the island. The Neostromboli eruptive period from about 13,000 to 5000 years ago was followed by formation of the modern edifice. The active summit vents are located at the head of the Sciara del Fuoco, a prominent horseshoe-shaped scarp formed about 5000 years ago as a result of the most recent of a series of slope failures that extend to below sea level. The modern volcano has been constructed within this scarp, which funnels pyroclastic ejecta and lava flows to the NW. Essentially continuous mild strombolian explosions, sometimes accompanied by lava flows, have been recorded for more than a millennium.