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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, December 22, 2016, 2:14 PM AKST (Thursday, December 22, 2016, 23:14 UTC)


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: ORANGE

Following about 25 hours of relative quiescence, another short-lived eruption occurred at Bogoslof yesterday late afternoon producing a large eruption cloud that rose to 35,000 ft asl, quickly detached, and moved northeastward over the Bering Sea. The cloud-forming eruption started at around 16:10 AKST 21 Dec 2016 (01:10 UTC, 22 Dec 2016) with seismicity visible on stations located on nearby islands that lasted ~30 minutes. The eruption was also detected on several nearby infrasound arrays. Observers in Dutch Harbor reported seeing the cloud as it developed. AVO elevated the Aviation Color Code to RED and the Volcano Alert Level to WARNING at 16:32 AKST 21 Dec (02:32 UTC 22 Dec). After the eruption, seismicity abruptly declined to low levels and remained so through the evening. At 23:18 AKST (08:18 UTC 22 Dec) AVO lowered the Color Code/Alert Level to ORANGE/WATCH.

Recent satellite imagery shows that this eruption dramatically changed Bogoslof Island, and that a new, small island has formed just offshore of the northeast end of the main island. The former shore and much of the northeast side of Bogoslof Island adjacent to this island has been largely removed, and deposition of material has occurred on the west side of the island. The excavated area of the former northeast shore is likely the vent for this recent eruption, which appears to be just below sea level.

Seismicity was relatively low into the early morning hours of 22 December until 01:20 AKST (10:20 UTC) with the sudden onset of strong tremor that continued until 07:40 AKST (16:40 UTC). Although this likely was eruptive activity, no evidence of ash emission was observed in satellite images. Seismicity was low until an abrupt increase in moderate tremor began at about 11:04 AKST (21:04 UTC). This activity began to decline within the past hour. No ash emissions or elevated surface temperatures are evident in satellite images.

AVO has no ground-based volcano monitoring equipment on Bogoslof volcano. We are monitoring eruptive activity using satellite images and data from distant seismic and infrasound instruments.


PAVLOF VOLCANO (VNUM #312030)
55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Unrest continues at Pavlof Volcano. No significant activity was observed in mostly clear satellite images today. Web camera images were obscured by low clouds. Nothing significant was detected in seismic or pressure sensor data during the past day.

The degree of unrest at Pavlof can change quickly. A return to eruptive activity can occur with with little or no warning. AVO is closely monitoring the volcano.


CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Low-level unrest continues at Cleveland. No significant activity observed in mostly clear satellite images today. No significant activity was detected in seismic or pressure sensor data during the past 24 hours.

OTHER ALASKA VOLCANOES

Other Alaska volcanoes show no signs of significant unrest: http://www.avo.alaska.edu/activity/

AVO scientists conduct daily checks of earthquake activity at all seismically-monitored volcanoes, examine web camera and satellite images for evidence of airborne ash and elevated surface temperatures, and consult other monitoring data as needed.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

FOR MORE INFORMATION ON ALASKA VOLCANOES: http://www.avo.alaska.edu

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska.avo

CONTACT INFORMATION:

Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Janet Schaefer, Acting Coordinating Scientist, DGGS
janet.schaefer@alaska.gov (907) 322-4085



The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].
Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/activity/avoreport.php
Page modified: February 17, 2017 10:11
Contact Information: AVO Web Team

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