Report on Stromboli (Italy) — January 1994

Bulletin of the Global Volcanism Network, vol. 19, no. 1 (January 1994)
Managing Editor: Richard Wunderman.

Stromboli (Italy) Seismicity continues to rise following October explosions

Please cite this report as:

Global Volcanism Program, 1994. Report on Stromboli (Italy). In: Wunderman, R (ed.), Bulletin of the Global Volcanism Network, 19:1. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN199401-211040.

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Stromboli

Italy

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

All times are local (unless otherwise noted)


A sudden decrease in seismicity followed the explosive episodes of mid-October 1993. Both number of recorded events and tremor level declined to below "normal" levels (figure 32). This pattern is similar to that observed after other explosive episodes in February and May 1993. Although problems with solar panel efficiency resulted in data loss during December, an increase in seismicity was still evident through December 1993 and January 1994.

Figure (see Caption) Figure 32. Seismicity recorded at Stromboli, October 1993-January 1994. Open bars show the number of recorded events/day, the solid bars those with ground velocities >100 microns/second. The lines show daily tremor energy computed by averaging hourly 60-second samples. Courtesy of R. Carniel.

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: R. Carniel, Univ di Udine.