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ARCHIVED REPORT
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CHIGINAGAK VOLCANO



Fish and Wildlife Service personnel in the field and citizens of Pilot Point reported that on Thursday, 8/13, the usual white steaming from Chiginagak volcano fumaroles changed for a time to puffs of black ash accompanied by a greenish-yellow gas and steam plume rising about 500 to 1000 ft above the volcano. A dusting of black ash was observed on fresh snow on the upper part of the volcano this morning. However, the plume had reverted to white steam. The activity was not substantial enough to be detected by satellite imagery. AVO has no seismic instruments on the volcano but will watch the activity via satellite and in cooperation with ground observers.



Chiginagak Volcano is a 7005-ft-tall (2135 m) snow- and ice-covered symmetric stratovolcano. It is located 110 miles (175 km) south of King Salmon and 37 miles (60 km) southeast of Pilot Point on the Alaska Peninsula. On October 22, 1997, AVO received multiple reports of increased steaming, snowmelt, and sulfur smells. Robust steam plumes have issued from an active fumarole at an elevation of about 5500 feet (1676 m) on the north flank of the volcano since at least 1943 and sulfur deposition in the vicinity of the fumarole discolors the adjacent snow and ice. Reports of historic activity at Chiginagak are poorly documented. Prehistoric domes, young pyroclastic deposits and lava flows occur on the volcano's flanks.



ALASKA VOLCANOES



Seismic activity is monitored in real time at 16 volcanoes

in Alaska. Some of these volcanoes may currently display

anomalous seismicity, but they are not considered to be at a dangerous level of unrest.

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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
Contact Information: AVO Web Team

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