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Shishaldin volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 30 October-5 November 2019 (New Activity / Unrest)

Wed, 30 Oct 2019, 06:00
06:00 AM | BY: VN
AVO reported that by 28 October two stalled lava flows extended as far as 1.8 km down Shishaldin's NW flank, lahars had traveled at least 4 km down the NW flank, and trace ash deposits on the N flank were identified in satellite images. Activity paused during 29-30 October but resumed on 31 October. Numerous small explosions were detected by the local seismic network during 31 October-1 November and incandescence was visible in webcam images.
There was no evidence of active lava flows outside of the summit crater. During 1-2 November seismicity remained elevated characterized by periods of high-amplitude tremor. Small explosions were recorded in seismic and infrasound data.
Elevated surface temperatures were detected in satellite images and incandescence was observed in webcam images overnight. A pilot observed a lava flow in the morning of 2 November. Sporadic incandescence recorded by the webcam overnight during 2-3 November suggested minor explosive activity and/or lava fountaining.
On 3 November lava overflowed the summit crater and traveled at least 400 m down the NW flank and 300 m down the SE flank. By 4 November the flow on the NW flank had branched and lengthened to 1 km. Lahars were as long as 2 km on the N and S flanks.
Spatter deposits from explosions or fountaining were visible on the summit cone. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)
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From: Global Volcanism Program, 2019. Report on Shishaldin. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 30 October-5 November 2019. Smithsonian Institution and US Geological Survey.

Previous news

Thu, 24 Oct 2019, 21:19
Satellite data is now showing that the deep summit crater has been filled and lava is starting to flow over the rim with spatter from Strombolian explosions also being deposited. This melted some of the thick ice sending a lahar halfway down the north flank. Elevated seismicity continues. Read all
Thu, 24 Oct 2019, 15:09
Small steam plume from Shishaldin (image: AVO)
Alaska Volcano Observatory recorded low-level eruptive activity with periodic bursts of lava within the summit crater of Shishaldin and a small steam plume over the past day. ... Read all
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