On 19 April AVO noted that no new volcanic activity at Bogoslof had been detected in satellite, seismic, or infrasound data since a short-lived increase in seismicity on 15 April; AVO lowered the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory.
Seismic signal from Bogoslof volcano, MSW station (on Makushin 60 km to the east from Bogoslof)
The Alaska Volcano Observatory (AVO) detected an increase in earthquake activity at the volcano since 15 April around 15:01 AKST / 23:01 UTC. Although no evidence of new eruptive activity has been found so far, the alert level of the volcano was raised again.
Wed, 12 Apr 2017, 06:00
Increased seismicity at Bogoslof was recorded by stations on nearby islands starting around 1501 on 15 April, prompting AVO to raise the Aviation Color Code to Orange and the Volcano Alert Level to Watch. The seismic activity subsided a few hours later; there was no evidence of renewed eruptive activity from infrasound, lightning, or satellite data during 15-18 April.
Read allThu, 6 Apr 2017, 15:48
No more activity has been detected at the volcano during the past 3 weeks (since 13 Mar) and therefore the alert level was lowered to "Yellow".
Read allWed, 5 Apr 2017, 06:00
On 5 April AVO reported that the Aviation Color Code for Bogoslof was lowered to Yellow and the Volcano Alert Level was lowered to Advisory based on the absence of detected activity at the volcano for the past three weeks; the last large explosion occurred on 8 March. No significant volcanic activity was detected in seismic, infrasound, or satellite data during 6-11 April.
Read allWed, 29 Mar 2017, 06:00
AVO reported that no significant volcanic activity at Bogoslof was detected in seismic or infrasound data during 29 March-4 April, and satellite views were often obscured by clouds or showed nothing noteworthy. Weakly elevated surface temperatures were identified in satellite images during 28-29 March. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.
Read allWed, 22 Mar 2017, 06:00
AVO reported that no significant volcanic activity at Bogoslof was detected in seismic or infrasound data during 22-28 March, and satellite views were often obscured by clouds or showed nothing noteworthy. Weakly elevated surface temperatures were identified in satellite images during 21-23 March. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.
Read allWed, 15 Mar 2017, 06:00
AVO reported that no significant volcanic activity at Bogoslof was detected in seismic or infrasound data during 15-21 March, and satellite views were either obscured by clouds or showed nothing noteworthy. Slightly elevated surface temperatures were identified in satellite images during 16-17 and 20-21 March. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.
Read allMon, 13 Mar 2017, 12:30
Wed, 8 Mar 2017, 10:58
Lightnings detected in the ash plume within one hour shortly after the eruption (WWLLN / AVO)
After two weeks of relative calm, another large explosion has occurred a short time ago at the volcano, showing that the recent eruptive phase is not over yet.
Read allWed, 8 Mar 2017, 09:45
Wed, 8 Mar 2017, 06:00
AVO reported that an explosive event at Bogoslof began at about 2236 on 7 March, indicated in seismic, lightning, and infrasound data, and lasted about three hours. Though ash was not immediately visible in satellite data, AVO raised the Aviation Color Code (ACC) to Red and the Volcano Alert Level (VAL) to Warning. Later, satellite images showed a large ash cloud rising to an altitude of 10.7 km (35,000 ft) a.s.l. and drifting E.
Read allWed, 1 Mar 2017, 06:00
AVO reported that no significant volcanic activity at Bogoslof had been detected in seismic, infrasound, or sometimes cloudy satellite data during 1-7 March. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.
Read allWed, 22 Feb 2017, 06:00
AVO reported that no significant volcanic activity at Bogoslof had been detected in seismic, infrasound, or mostly cloudy satellite data during 22-28 February. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.
Read allMon, 20 Feb 2017, 13:52
February 19 Bogoslof eruption plume as seen from Unalaska Island, 53 miles ESE of Bogoslof volcano. Photo taken from helicopter during fieldwork by AVO geologists at 5:22PM, approximately 14 minutes after the start of the eruption. (image: Janet Schaefer / AVO)
More explosions occurred at the volcano this morning. The Alaska Volcano Observatory detected a "series of short, explosive eruptions that started at 17:08 AKST local time (02:08 February 20 UTC) and lasted until 17:45 AKST (02:45 February 20 UTC).
Read allMon, 20 Feb 2017, 03:00
Sat, 18 Feb 2017, 15:26
Seismic signal from Bogoslof volcano, MSW station (on Makushin 60 km to the east from Bogoslof)
Two more explosive eruptions occurred last night and today, following yesterday's event after only 8 hours pause.
Read allSat, 18 Feb 2017, 14:45
Fri, 17 Feb 2017, 21:16
Lightings detected near Bogoslof volcano during the past hour (image: WWLLN / AVO)
Another large explosive eruption is occurring at the volcano this evening.
Read allFri, 17 Feb 2017, 20:00
Wed, 15 Feb 2017, 06:00
AVO reported that during 15-16 February cloud cover prevented satellite views of Bogoslof; no other data indicated eruptive activity. At 0955 on 17 February seismic data indicated the beginning of an explosive event, prompting AVO to raise the Aviation Color Code (ACC) to Red and the Volcano Alert Level (VAL) to Warning. Individual pulses of seismicity was recorded until 1140, and then afterwards seismicity was low.
Read allMon, 13 Feb 2017, 17:28
Seismic signal from Bogoslof volcano, MSW station (on Makushin 60 km to the east from Bogoslof)
After a relatively long pause, a new explosion is now occurring at the volcano.
Read allWed, 8 Feb 2017, 06:00
AVO reported that during 8-12 and 14 February cloud cover prevented satellite views of Bogoslof; no other data indicated eruptive activity. At 0724 on 13 February seismicity significantly increased, prompting AVO to raise the Aviation Color Code (ACC) to Red and the Volcano Alert Level (VAL) to Warning. Satellite images acquired through 0930 showed no ash emissions above the 3 km (10,000 ft) a.s.l. cloud deck, and no lightning was detected.
Read allSun, 5 Feb 2017, 16:18
Changes of Bogoslof Island during the recent series of explosions; The January 30-31, 2017 eruptive activity generated roughly 0.4 square kilometers of new land and as of January 31, 2017, the island area was 1.02 square kilometers, roughly three times the size of the pre-eruption island. Nearly all of this new material consists of unconsolidated pyroclastic fall and flow (surge) deposits that are highly susceptible to wave erosion and thus additional changes in the configuration of the island are likely. (image: Chris Waythomas / AVO)
The volcano continues to produce large explosions at intervals of 1-3 days. The latest eruption began at 01:41 UTC on February 4 (16:41, February 3 AKST) produced a small volcanic ash plume that was observed on satellite and moved towards the north over the Bering Sea at an altitude of less than 25,000 ft above sea level.
Read allSat, 4 Feb 2017, 03:00
Wed, 1 Feb 2017, 06:00
AVO reported that no further emissions were detected at Bogoslof after an explosion at 0520 on 31 January; the Aviation Color Code (ACC) was lowered to Orange and the Volcano Alert Level (VAL) was lowered to Watch the next day. A burst of tremor lasting nine minutes was detected starting at 0457 on 3 February. A second burst, starting at 0533 and lasting 20 minutes, was also detected by infrasound instruments, indicating an explosion.
Read all