Bogoslof Volcano, Aleutian Islands: News & Activity Updates

Latest (2023) | Jul-Dec 2017 | May-Jun 2017

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

Wednesday, Nov 29, 2023 | 2 years ago · VN

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 unre…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.
A seismic swarm had started around 22 October and was characterized by 5-10 events …Open article

Bogoslof volcano (Aleutian Islands): seismic activity reduced

Saturday, Nov 25, 2023 | 2 years ago · martin

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.
During the swarm, approx. 1100 quakes in total at regular intervals of 5 t…Open article

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

Wednesday, Nov 1, 2023 | 2 years ago · VN

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 remai…Open article

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

Wednesday, Oct 25, 2023 | 2 years ago · VN

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…Open article

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

Wednesday, Oct 25, 2023 | 2 years ago · martin

An increased seismic activity has been monitored at the volcano over the past 90 days, the Alaska Volcano Observatory (AVO) reported.
Increases in seismic activity typically precede eruptions, but many…Open article

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

Wednesday, Dec 6, 2017 | 7 years ago · VN

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 ligh…Open article

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

Wednesday, Sep 27, 2017 | 8 years ago · VN

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…Open article

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

Wednesday, Sep 20, 2017 | 8 years ago · VN

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 el…Open article

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

Wednesday, Sep 13, 2017 | 8 years ago · VN

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 el…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, possi…Open article

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

Wednesday, Sep 6, 2017 | 8 years ago · VN

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 repo…Open article

Bogoslof volcano Volcanic Ash Advisory: 30/1230Z

Wednesday, Aug 30, 2017 | 8 years ago

Volcanic Ash Advisory Center Anchorage (VAAC) issued the following report:

FVAK21 at 13:18 UTC, 30/08…Open article

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 30 August-5 September 2017 (Continuing Activity)

Wednesday, Aug 30, 2017 | 8 years ago · VN

AVO reported that an explosive event at Bogoslof began at 0405 on 30 August and continued intermittently until 0555; the event produced a low-level ash plume that rose to around 6.1 km (20,000 ft) a.s.l. and drifted SSE. Later that day seismic and infrasound data showed quiet conditions, and a low-l…AVO reported that an explosive event at Bogoslof began at 0405 on 30 August and continued intermittently until 0555; the event produced a low-level ash plume that rose to around 6.1 km (20,000 ft) a.s.l. and drifted SSE. Later that day seismic and infrasound data showed quiet conditions, and a low-level plume (likely steam) drifted almost 65 km SSE.
Satellite, infrasound, and seismic data showed nothing notable during 31 August-5 September. 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, 2017. Report on Bogoslof. In: Mayberry, G (ed.), Weekly Volcanic Activi…Open article

Bogoslof volcano Volcanic Ash Advisory: ERUPTION AT 20170828/1917Z

Monday, Aug 28, 2017 | 8 years ago

Volcanic Ash Advisory Center Anchorage (VAAC) issued the following report:

FVAK21 at 20:04 UTC, 28/08/17 from PAWU
VAAAK1
VA ADVISORY

DTG: 20170828/2000Z

VAAC: ANCHORAGE

VOLCANO: BOGOSLOF 311300

PSN: N5356 W…Open article

Bogoslof volcano Volcanic Ash Advisory: BRIEF APPROX 2 MIN EXPLOSIVE ERUPTION AT 27/2308 UTC.

Monday, Aug 28, 2017 | 8 years ago

Volcanic Ash Advisory Center Anchorage (VAAC) issued the following report:

FVAK21 at 00:10 UTC, 28/08/17 from PAWU
VAAAK1
VA ADVISORY

DTG: 20170828/0015Z

VAAC: ANCHORAGE

VOLCANO: BOGOSLOF 311300

PSN: N5356 W…Open article

Bogoslof volcano Volcanic Ash Advisory: 0029 UTC ERUPTION LASTING APPRX 4 MIN.

Sunday, Aug 27, 2017 | 8 years ago

Volcanic Ash Advisory Center Anchorage (VAAC) issued the following report:

FVAK21 at 01:28 UTC, 27/08/17 from PAWU
VAAAK1
VA ADVISORY

DTG: 20170827/0125Z

VAAC: ANCHORAGE

VOLCANO: BOGOSLOF 311300

PSN: N5356 W…Open article

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 August-29 August 2017 (Continuing Activity)

Wednesday, Aug 23, 2017 | 8 years ago · VN

AVO reported that a satellite image of Bogoslof acquired at 0628 on 24 August showed elevated surface temperatures and a small plume that was most likely steam drifting 17 km S. During 24-25 August a robust steam plume drifting 70 km SE and elevated surface temperatures were identified in satellite …AVO reported that a satellite image of Bogoslof acquired at 0628 on 24 August showed elevated surface temperatures and a small plume that was most likely steam drifting 17 km S. During 24-25 August a robust steam plume drifting 70 km SE and elevated surface temperatures were identified in satellite data. A four-minute-long explosion that began at 1629 on 26 August generated an eruption cloud that rose 8.2 km (27,000 ft) a.s.l. and drifted SE.
The event was also observed in seismic and infrasound data, and one lightning stroke was detected.

Three short-duration eruptive events occurred during 27-28 August. The first, a two-minute-long explosion at 1508 on 27 August, produced a volcanic cloud t…Open article

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 16 August-22 August 2017 (Continuing Activity)

Wednesday, Aug 16, 2017 | 8 years ago · VN

AVO reported that photographs of Bogoslof taken during an overflight on 15 August showed that the vent area (which had dried out during the 7 August eruption) had refilled with water. Seismicity decreased on 16 August and remained low at least through 18 August. Weakly elevated surface temperatures …AVO reported that photographs of Bogoslof taken during an overflight on 15 August showed that the vent area (which had dried out during the 7 August eruption) had refilled with water. Seismicity decreased on 16 August and remained low at least through 18 August. Weakly elevated surface temperatures consistent with a warm lake were identified in satellite data during 19-20 August.
Satellite data acquired on 21 August showed an approximately 125-m-diameter lava dome within the intra-island lake, just W of the 1992 lava dome. A cold volcanic plume, likely from the lava dome, drifted about 55 km S of the island. Some minor explosions were detected in infrasound data at about 0410 on 22 August.
The…Open article

Bogoslof volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 9 August-15 August 2017 (Continuing Activity)

Wednesday, Aug 9, 2017 | 8 years ago · VN

AVO reported that on 9 August seismic and infrasound data suggested low-level eruptive activity at Bogoslof; weakly elevated surface temperatures and a minor steam emission were identified in satellite images. No significant activity was observed in cloudy satellite images, and no activity was detec…AVO reported that on 9 August seismic and infrasound data suggested low-level eruptive activity at Bogoslof; weakly elevated surface temperatures and a minor steam emission were identified in satellite images. No significant activity was observed in cloudy satellite images, and no activity was detected in seismic, infrasound, or lightning data during 10-13 August. Two short pulses of tremor were detected (at 0853, lasting five minutes, and at 0913, lasting three minutes) in seismic data; seismicity returned to baseline levels afterwards.
A sequence of seismic events began at 0000 on 15 August; no activity was observed in infrasound, lightning, or satellite data. The Aviation Color Code remain…Open article

Bogoslof volcano (Aleutian Islands): no further ash emissions since last night

Tuesday, Aug 8, 2017 | 8 years ago · T

The Alaska Volcano Observatory reports that "no further ash emissions have occurred since the 3-hour-long eruption on Monday, 7 August that began around 10:00 AKST (18:00 UTC), and seismicity remains low.
"We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Addi…Open article

Bogoslof volcano (Aleutian Islands): eruption last night, ash to 32,000 ft altitude