Report on Stromboli (Italy) — February 2004

Bulletin of the Global Volcanism Network, vol. 29, no. 2 (February 2004)
Managing Editor: Edward Venzke.

Stromboli (Italy) After 10 February 2004, explosions at upper limit of that typically seen

Please cite this report as:

Global Volcanism Program, 2004. Report on Stromboli (Italy). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 29:2. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN200402-211040.

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Stromboli

Italy

38.789°N, 15.213°E; summit elev. 924 m

All times are local (unless otherwise noted)


According to aviation reports from the U.S. Air Force, the web camera at Stromboli captured shots of light ash emissions on 7 and 11 November 2003. In both cases plumes rose to ~ 2.5 km elevation. The Stromboli Web video camera showed a small explosion on 10 December 2003 that produced a plume to a height of ~ 1 km above the volcano. No ash was visible on satellite imagery.

The Istituto Nazionale di Geofisica e Vulcanologia (INGV) in Catania reported that explosive activity at Stromboli's three summit craters increased after 10 February 2004, leading to significant growth of the cinder cones inside the craters. Several powerful explosions, especially from Crater 1 (the NE crater) and Crater 3 (the SW crater), sent scoriae 200 m above the rims. These powerful explosions led to fallout of fresh bombs and lapilli on Il Pizzo Sopra la Fossa (an area atop the volcano about 100 m above the crater terrace) in early March. As of 8 March, Strombolian activity was occurring at the volcano, with variations in the number and frequency of explosions within normally observed limits, and the intensity of explosions at the higher limit of commonly observed activity.

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, 924-m-high 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 Stromboli 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.

Information Contacts: Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione di Catania Piazza Roma 2, 95123 Catania, Italy (URL: http://www.ct.ingv.it/, Email: calvari@ct.ingv); Toulouse VAAC, Météo-France, 42 Avenue G. Coriolis, 31057 Toulouse, France (URL: http://www.meteo.fr/aeroweb/info/vaac/, Email: vaac@meteo.fr); AGI Online news service, Italy (URL: http://www.agi.it/).