Global & Disaster Medicine

Alaska: Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition

Alaska Volcano Observatory:  The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS).

AVO Image

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.

Date: February 19, 2017 5:22 PM
Volcano(es): Bogoslof
Photographer/Creator: Schaefer, Janet
URL: http://www.avo.alaska.edu/images/image.php?id=105151
Citation Information:
Image courtesy of the AVO/ADGGS.
BOGOSLOF VOLCANO (VNUM #311300)
53°55’38” N 168°2’4″ W, Summit Elevation 492 ft (150 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGEThere has been no new volcanic emissions observed at Bogoslof volcano since the eruption yesterday, May 28 at 22:16 UTC. No detectable activity has been observed in data from seismic or infrasound stations located on nearby Islands and no new activity has been observed in satellite data. Pilot Reports indicate that a volcanic cloud from yesterday’s eruption has been detected drifting to the northeast of Bogoslof and a SIGMET aviation warning message has been issued by the National Weather Service. Please see the NWS AAWU at http://aawu.arh.noaa.gov/sigmets.php for updated information on aviation warning messages.Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Activity may ramp back up with additional explosions producing high-altitude (>15,000 ft) volcanic clouds with little precursory activity. Some previous explosions have been preceded by an increase in earthquake activity that allowed for short-term forecasts of imminent significant explosive activity. Although we are able to detect energetic explosive activity in real-time, there is typically a lag of tens of minutes until we can characterize the magnitude of the event and the altitude of the volcanic cloud. It is possible for low-level unrest, including explosive activity, to occur that we are unable to detect with existing data sources. Such low-level periods of unrest and possible explosions could pose a hazard in the immediate vicinity of the volcano.

AVO Image


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