A subsequent pilot report made 50 minutes later indicated that activity had decreased. The seals seem unfazed by the holes in the center of the.5 square-mile island … 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. Approximately horizontal new land ("rocks" on figure 1) extended slightly above sea level just NNE of the dome. Seismic and infrasound data from neighboring islands indicated another explosive event, beginning at 2230 on 8 January. It produced an ash plume that rose as high as 11 km (36,000 ft) a.s.l. The last detected explosive activity occurred on 30 August 2017.Intermittent eruptions from Bogoslof, 40 km N of the main Aleutian arc (BGVN 42:09, figure 2), have created and destroyed several distinct islands at the summit of this submarine volcano. It was the first evidence of seals breeding on any island in the eastern Bering Sea other than a small chain called the Pribilofs.The first dedicated survey of seals there was conducted in 1997.

AVO reported that the explosive eruption at Bogoslof, which was reported by several pilots around 1530 on 20 December and produced an ash plume that rose to 10.3 km (34,000 ft) a.s.l., lasted about 30 minutes. On 13 June, a six-minute-long explosion occurred, although no ash cloud was observed in satellite imagery likely because it's altitude was below detection limits.Weakly elevated surface temperatures detected in satellite imagery on 10 and 11 June suggested to AVO that a new lava dome was extruding beneath the ocean surface. Weakly elevated surface temperatures were detected on 16 June, and a 13-km-long steam plume was visible on 18 June. Four short-duration explosions were detected in seismic and/or infrasound data between 5 and 7 June, and generated volcanic clouds that in many cases were too small to be observed in satellite data.

A nine-minute-long eruption pulse was detected in seismic data starting at 1015 on 8 July was followed by a shorter pulse that began at 1029 and then a decline in seismicity.

and drifted N. AVO raised the ACC to Red and the VAL to Warning, but lowered them back down to Orange and Watch, respectively, the next day. Weakly elevated surface temperatures were identified in satellite images during 13-14 and 16-17 September, indicating ongoing unrest. Three short-duration eruptive events occurred during 27-28 August. A sequence of seismic events began at 0000 on 15 August; no activity was observed in infrasound, lightning, or satellite data. The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives.

Satellite imagery showed persistent degassing from the island in between explosions. Cloud-top temperatures seen in satellite data indicated that it rose as high as 7.3 km altitude. Also, a substantial submarine sediment plume was seen in satellite imagery drifting N from the lagoon area (figure 11). The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.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.AVO reported that during 15-16 February cloud cover prevented satellite views of Bogoslof; no other data indicated eruptive activity. The eruptive vent, however, remained below sea level in the N portion of a figure-eight-shaped bay, as indicated by the presence of upwelling volcanic gases. Eruptive activity ended on 30 August. A satellite image from 23 February showed that the vent location at Bogoslof remained underwater.

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