Report on Stromboli (Italy) — October 1992

Bulletin of the Global Volcanism Network, vol. 17, no. 10 (October 1992)
Managing Editor: Lindsay McClelland

Stromboli (Italy) Continuous spatter ejection; occasional vigorous explosions; seismicity increases

Please cite this report as:

Global Volcanism Program, 1992. Report on Stromboli (Italy). In: McClelland, L (ed.), Bulletin of the Global Volcanism Network, 17:10. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN199210-211040.

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Stromboli

Italy

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

All times are local (unless otherwise noted)


Fieldwork during the third week in October revealed that eruptive activity was mainly concentrated in crater 1, in the NE part of the summit area. Spatter ejection was nearly continuous and explosions were frequent from C1's NE vent. Rare strong explosions from vent 5 of C3 (SW summit area) fed black plumes about 200 m high. Strong noisy degassing occurred from C2, with some spatter emission from vents that had developed from pre-existing fissures. C1 had been partially filled with debris and the spatter cone in C3 destroyed.

Tremor energy and the number of earthquakes increased steadily in September and October (figure 27). The strongest activity was recorded 14-16 October with > 20 events/hour (20% with ground velocities exceeding 100 mm/s).

Figure (see Caption) Figure 27. Seismicity recorded at Stromboli, September-October 1992. Open bars show the number of recorded events per day, the solid bars those with ground velocities exceeding 100 Nm/s. The curve represents tremor energy computed using 60-second samples taken every hour, then averaged daily. Courtesy of M. Riuscetti.

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: M. Riuscetti, Univ di Udine.