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Shishaldin volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 20 November-26 November 2019 (New Activity / Unrest)

Mi, 20. Nov 2019, 06:00
06:00 AM | VON: VN
AVO reported that increased seismicity and higher surface temperatures at Shishaldin during 19-20 November indicated elevated eruptive activity. Seismicity abruptly dropped at 0340 on 20 November and remained low, heralding another pause in activity. Tremor and surface temperatures remained low through 23 November.
Seismicity again increased during 24-25 November and small explosions were detected in local and regional infrasound stations. Strongly elevated surface temperatures were observed in multiple satellite images. A partial collapse of the summit cone sometime around 1430 on 24 November produced a pyroclastic flow that traveled as far as 3 km down the NW flank.
A new lava flow on the NW flank was several hundred meters long. Seismicity decreased but remained elevated during 25-26 November. Strongly elevated surface temperatures were identified in multiple satellite images, and incandescence from the summit was occasionally visible in web camera images overnight.
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 20 November-26 November 2019. Smithsonian Institution and US Geological Survey.

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Di, 19. Nov 2019, 23:21
Over the past 24 hours, the Alaskan Volcano Observatory recorded seismicity levels at Shishaldin Volcano and found that they had climbed to a level similar to that observed during other eruptive periods over the past few weeks, consistent with the resumption of eruptive activity at the volcano. This is further supported by strong surface temperatures observed in cloudy satellite images. Between heavy clouds, AVO noticed either a lava flow or lahar through webcam images extending down the southeast flank of the volcano. No ash plumes have been detected. ... Read all
Mi, 13. Nov 2019, 06:00
AVO reported that the eruption at Shishaldin continued at variable levels during 13-19 November. Seismicity increased during 13-14 November, and elevated surface temperatures were visible in satellite and webcam data. Minor ash emissions were visible and likely resulting from spatter cone collapses. ... Read all
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