Report on Stromboli (Italy) — 21 June-27 June 2017
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 21 June-27 June 2017
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2017. Report on Stromboli (Italy). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 21 June-27 June 2017. Smithsonian Institution and US Geological Survey.
38.789°N, 15.213°E; summit elev. 924 m
All times are local (unless otherwise noted)
INGV reported that during 22-26 June explosions at the N1 vent, one of two vents that comprise Stromboli’s N Area, ejected material as high as 200 m above the vent. Explosive activity at the second vent, N2, ejected tephra 150 m high that fell within the crater terrace as well as beyond the crater rim. Intense spattering at N2 was noted on 26 June. Explosions from the N Area vents occurred at a rate of 10-14 events per hour. Vent C in the CS Area discontinuously puffed, and spattering also occurred on 26 June. Explosions from the S1 vents (also part of the CS Area) ejected tephra 150 m high. Explosions from the CS Area occurred between 5 and 10 events per hour.
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.