Bogoslof volcano, as seen from a satellite image, 18 minutes after the start of the eruption 5.28.17
Bogoslof once again went red on Monday morning at 10am. The ash plume extended to 32,000′. The ash cloud from the above photo, from a May eruption, rose to over 40,000′. Since December, Bogoslof has erupted 60 times.
Bogoslof’s eruption of 23 December 2016. Photo credit: Crew of USCG Cutter Alex Haley
With Bogoslof being as active as it has been recently, there has been an increase in interest regarding Alaska’s many volcanoes. Since mid December, Bogoslof has erupted ten times.
Plume from the eruption of Bogoslof on 20 December. Photo credit: Paul Tuvman/AVO
According to Alaska Volcano Observatory, which is a joint program by the U.S. Geological Survey and the University of Alaska – Fairbanks, Alaska has 90 volcanoes that have erupted in the past 10,000 years – and could erupt again. Of those 90, 50 have erupted since records started being kept in 1760.
Unlike volcanoes in Hawaii, which tend to ooze lava, Alaska volcanoes usually explode, sending ash as high as 50,000 feet in the air. Airlines get anxious when ash gets above 20,000 feet, and Bogoslof has consistently sent plumes into the 35,000′ range.
FAA estimates that roughly 80,000 large aircraft fly downwind of the Aleutian volcanoes yearly, with 30,000 people doing so every day. When Redoubt erupted in 1989, a KLM jet, which was 150 miles away, flew through Redoubt’s ash path. The jet lost all four engines with 231 people on board. The aircraft had dropped two miles, down to just over 13,000 feet, when the crew managed to restart the engines, and safely land in Anchorage.
Changes in Bogoslof Island with the recent eruptions. Credit: USGS/AVO
Photos and statistics come courtesy of AVO and their website. A special shoutout to the USCG Cutter Alex Haley: Nice photo, I hope its inclusion in the post is acceptable.
The submarine volcano at Bogoslof Island in the Aleutian Chain has gone Red twice in two days. An ash plume was sent up 34,000 feet on Wednesday, causing some concern for passing aircraft.
Bogoslof Island was first mapped after it’s eruption in 1796. The 173 acre island has seen six eruptions since then, from various vents. The island rises to 490′ above sea level, but approximately 6000′ from the seabed.
Castle Rock on Bogoslof Island; Photo credit: Ann Harding/AVO
“Castle Rock”, as seen above, is the eroded remnant of a dome from the 1796 eruption. Currently, AVO has downgraded the alert level to Orange.