Report on Stromboli (Italy) — February 1993

Bulletin of the Global Volcanism Network, vol. 18, no. 2 (February 1993)
Managing Editor: Edward Venzke

Stromboli (Italy) Seismicity and tremor resume after 10 February explosions

Please cite this report as:

Global Volcanism Program, 1993. Report on Stromboli (Italy). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 18:2. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN199302-211040.

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Stromboli

Italy

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

All times are local (unless otherwise noted)


Seismicity between 1 November 1992 and 28 February 1993 was stable except for two episodes of heightened activity (figure 28). High tremor energy and >25 explosion-earthquakes/hour were recorded on 6 December. On 10 February, three strong explosions occurred followed by a sudden decrease of tremor to about one-sixth the energy and one-third the number of events. In the week preceding the 10 February explosions, a large number of strong shocks occurred, with a maximum of 76 on 7 February. After a few days of low seismicity following the explosions, tremor amplitude and the number of events gradually increased, reaching an isolated maximum on 22 February.

Figure (see Caption) Figure 28. Seismicity recorded at Stromboli, November 1992-February 1993. Open bars show the number of recorded events/day, the solid bars those with ground velocities >100 mm/s. The lines show daily tremor energy computed by averaging daily 60-second samples. 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.