Report on Stromboli (Italy) — 26 April-2 May 2023
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 26 April-2 May 2023
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2023. Report on Stromboli (Italy) (Sennert, S, ed.). Weekly Volcanic Activity Report, 26 April-2 May 2023. 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 ongoing Strombolian activity at Stromboli during 24-30 April. Activity was centered at two vents (one each at craters N1 and N2) in Area N, within the upper part of the Sciara del Fuoco, and from three vents in the Area C-S (South-Central Crater area) in the crater terrace area. Explosions at the N1 and N2 craters in Area N were low to medium intensity and ejected coarse material (bombs and lapilli), sometimes mixed with ash, 80-150 m high at a rate of 3-8 explosions per hour. Explosions at the three vents in sector S2 (Area C-S) ejected ash sometimes mixed with coarse material at an average rate of 4-7 explosions per hour. Sectors C and S1 in Area C-S did not show significant activity. Although thermal activity was generally low and the summit was often clouded by weather, a thermal anomaly was detected at 0150 on 29 April.
Geological Summary. Spectacular incandescent nighttime explosions at Stromboli have long attracted visitors to the "Lighthouse of the Mediterranean" in the NE Aeolian Islands. This volcano 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 took place between about 13,000 and 5,000 years ago. The active summit vents are located at the head of the Sciara del Fuoco, a prominent scarp that formed about 5,000 years ago due to a series of slope failures which extends 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.