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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, May 18, 2016, 12:51 PM AKDT (Wednesday, May 18, 2016, 20:51 UTC)


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

Unrest continues at Pavlof Volcano. No signs of eruptive activity in satellite images or significant seismic tremor since the low-level ash emissions that were observed yesterday. Sulfur dioxide gas emissions were detected in satellite data from yesterday afternoon, indicating the presence of degassing magma at shallow levels in the volcanic edifice. This is the first detectable gas emissions during this period of eruptive activity that began on May 13, 2016. Web camera views from Cold Bay remain obscured by low clouds and fog.

Pauses and fluctuations in eruptive activity are typical for Pavlof. It is possible for conditions to change at any time and more significant ash emissions may resume with little to no warning. AVO will continue to monitor the volcano closely.


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

Satellite data have confirmed the eruption of a small volume lava dome in the summit crater of Cleveland Volcano over the past several days. Lava extrusion may have been the source of weak seismic tremor that was observed yesterday. The low-relief 50-meter (165 ft) diameter dome is similar in size and morphology to the ten domes observed since 2011, the most recent of which was extruded earlier this month. Seismicity remains low and no explosions have been detected in infrasound (pressure sensor) or satellite data.

Previous domes have been destroyed by short duration explosive events that shower the upper cone with large blocks of lava, produce debris flows down the flanks of the volcano that at times extend to the ocean, and generate small volume ash clouds that are typically too small to be be observed in coarse (spatial) resolution meteorological satellite data. These explosion happen without warning, but are usually detected by pressure sensor data on the island, and/or at more distant locations.



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

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (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].
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URL: avo.alaska.edu/activity/avoreport.php
Page modified: February 17, 2017 10:11
Contact Information: AVO Web Team

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