Bogoslof Volcano (United States, Aleutian Islands): News & Activity Updates

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Previous news

Wed, 29 Nov 2023, 15:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 22 November-28 November 2023 (New Activity / Unrest)

AVO reported that seismicity at Bogoslof had declined during the previous three weeks to background levels and the last moderate earthquake, a M 2.7, was recorded on 9 November. No other signs of unrest were detected. Both the Volcano Alert Level and the Aviation Color Code were changed to Unassigned on 24 November. ... Read all

Sat, 25 Nov 2023, 14:48

Bogoslof volcano (Aleutian Islands): seismic activity reduced

Bogoslof Island in Alaska with the eroded remnants of Castle Rock lava dome from the 1796 eruption (image: AVO)

Following the seismic swarm at the volcano around mid-October, the intensity of earthquakes has declined to background levels. ... Read all

Wed, 1 Nov 2023, 15:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 October-31 October 2023 (New Activity / Unrest)

Unrest continued at Bogoslof during 25-31 October with numerous daily earthquakes recorded in seismic data. No additional signs of unrest were recorded in satellite data. The Volcano Alert Level remained at Advisory (the second level on a four-level scale) and the Aviation Color Code remained at Yellow (the second color on a four-color scale). ... Read all

Wed, 25 Oct 2023, 14:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 18 October-24 October 2023 (New Activity / Unrest)

AVO raised the Volcano Alert Level for Bogoslof to Advisory (the second level on a four-level scale) and the Aviation Color Code to Yellow (the second color on a four-color scale) on 24 October due to increased seismicity. Over 90 earthquakes were detected in the vicinity of the volcano during the previous three days. No signs of unrest had been recorded in satellite data over the past several days. ... Read all

Wed, 25 Oct 2023, 02:48

Bogoslof volcano (Aleutian Islands): increased seismic activity, alert level raised to Yellow

An increased seismic activity has been monitored at the volcano over the past 90 days, the Alaska Volcano Observatory (AVO) reported. ... Read all

Wed, 6 Dec 2017, 06:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 December-12 December 2017 (Continuing Activity)

On 6 December AVO decreased the Aviation Color Code and Volcano Alert Level for Bogoslof to Unassigned, noting that no significant activity had been observed in seismic, infrasound, satellite, or lightning data during the past three months. The last detected explosive activity occurred on 30 August 2017. ... Read all

Wed, 27 Sep 2017, 06:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 September-3 October 2017 (Continuing Activity)

On 27 September AVO reported that the last explosion at Bogoslof was detected on 30 August, and no new volcanic activity was observed in satellite, seismic, or infrasound data since then. The Aviation Color Code was lowered to Yellow and the Volcano Alert Level was lowered to Advisory. ... Read all

Wed, 20 Sep 2017, 06:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 20 September-26 September 2017 (Continuing Activity)

AVO reported that during 20-26 September nothing significant was observed in partly to mostly cloudy satellite images of Bogoslof, and no activity was detected in seismic or infrasound data. Weakly elevated surface temperatures were identified in satellite images during 22-23 September, indicating ongoing unrest. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. ... Read all

Wed, 13 Sep 2017, 06:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 13 September-19 September 2017 (Continuing Activity)

AVO reported that during 13-19 September nothing significant was observed in partly to mostly cloudy satellite images of Bogoslof, and no activity was detected in seismic or infrasound data. Weakly elevated surface temperatures were identified in satellite images during 13-14 and 16-17 September, indicating ongoing unrest. On 17 September discolored ocean water was visible in satellite data, possibly representing outflow from the crater. ... Read all

Wed, 6 Sep 2017, 06:00

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 September-12 September 2017 (Continuing Activity)

AVO reported that during 6-12 September nothing significant was observed in mostly cloudy satellite images of Bogoslof, and no activity was detected in seismic or infrasound data. The 8 September report noted that the crater lake had been bisected by a narrow isthmus of land. Elevated surface temperatures were identified in one satellite image during 10-11 September. ... Read all

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