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Stromboli volcano (Italy): sudden large explosion this morning

Sun, 19 Jul 2020, 12:04
12:04 PM | BY: T
View of the crater area about one minute after the eruption this morning (image: LBZ webcam from Punta Labronzo)
View of the crater area about one minute after the eruption this morning (image: LBZ webcam from Punta Labronzo)
Glowing rockfalls from the explosion (image: LBZ webcam from Punta Labronzo)
Glowing rockfalls from the explosion (image: LBZ webcam from Punta Labronzo)
Ash plume from the eruption at night (image: Francesca Utano)
Ash plume from the eruption at night (image: Francesca Utano)
A sudden, very strong explosion occurred at the volcano this morning. It came without warning even though the volcano had been in a rather low state of activity levels during the recent weeks.
Our local friend Francesca Utano alerted us via message that she was waken up by the deep rumbling of an unusually long-lasting double eruption from the craters.When she looked up, a tall ash plume could be seen rising into the night sky.
According to geophysical data, this morning's explosion was about 10 times stronger than the average size of explosions at the volcano and comparable to the large eruption on 15 March 2017, but still about one order of magnitude smaller than the two paroxysms last year on 3 July and 28 August 2019.
Instruments detected significant ground deformation (as a larger gas bubble rose towards the surface inside the magma-filled conduit) during the 4 minutes before the eruption. The explosion occurred from a vent in the central/SW crater area and caused a pressure wave of 250 Pa were detected at 450 m distance, and showered the entire crater terrace and beyond with incandescent lava bombs.
Much of the ejected material slid down along the Sciara del Fuoco as glowing rock falls reaching the sea. It seems that no pyroclastic flows were generated, however.
The height of the ash plume is unknown and was not reported as it occurred during the night and probably dissipated quickly, but from available imagery seems to be in the order of 2-3 km above the summit.

Previous news

Wed, 15 Jul 2020, 06:00

Stromboli volcano (Aeolian Islands, Italy) - Smithsonian / USGS Weekly Volcanic Activity Report for 15 July-21 July 2020 (Continuing Activity)

INGV reported that during 13-19 July activity at Stromboli was characterized by ongoing explosive activity from two vents in Area N (north crater area) and four vents in Area C-S (south-central crater area). Explosions at the N1 vent in Area N sometimes ejected tephra 200 m high, and ejected lapilli and bombs radially. Low-intensity explosions at vent N2 ejected tephra 80 m high. ... Read all
Wed, 8 Jul 2020, 06:00

Stromboli volcano (Aeolian Islands, Italy) - Smithsonian / USGS Weekly Volcanic Activity Report for 8 July-14 July 2020 (Continuing Activity)

INGV reported that during 6-12 July activity at Stromboli was characterized by ongoing explosive activity mainly from three vents in Area N (north crater area) and three vents in Area C-S (south-central crater area). Moderate explosions from both areas ejected lapilli, bombs, and ash with decreasing frequency and intensity through the week. ... Read all
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Stromboli volcano
stratovolcano 926 m
Eolian Islands, Italy, 38.79°N / 15.21°E
Current status: erupting (4 out of 5) Stromboli volcano eruptions:
Persistant (near-constant) activity since at least 2-3000 years. Most recent effusive (lava flow) eruptions from Dec. 2002-July 2003, March 2007, Aug-Oct 2014. Paroxysm 3 July 2019
Typical eruption style
Small explosive (strombolian) eruptions, typically every 20-30 mins. Intermittently, ca. every 2-20 years, minor effusive eruptions (lava flows); on average 2-5 times per year larger explosions.

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