Report on Stromboli (Italy) — 24 August-30 August 2016
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 24 August-30 August 2016
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2016. Report on Stromboli (Italy). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 24 August-30 August 2016. 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 although unfavorable weather conditions often obscured views of the active vents at Stromboli during 16-22 August, some of the hourly explosions were recorded by a webcam. Explosions mainly occurred from two vents in the S part of the crater and one vent in the N part. Low-to-medium intensity explosions from the N vent ejected coarse material mixed with ash. The S vents were variably active, with some explosions ejecting coarse material tens of meters above the crater rim. The report noted that the rate of explosions, geochemistry, and seismicity were all at low, normal levels for Stromboli, with the exception of an increased number and intensity of very-long-period earthquakes on 22 August.
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.