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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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COOK INLET VOLCANOES



Increased earthquake activity at Iliamna Volcano, which began several weeks ago, continued during the past week. The magnitudes of these earthquakes mostly range from 0.1 to 1.0, too small to be felt. The largest earthquake of the swarm occurred on August 19, and had a magnitude of 3.2. A similar but less intense cluster of earthquakes occurred at Iliamna during mid-May of this year. Fluctuations in the rate of small earthquakes are common at volcanoes, and the present earthquake activity at Iliamna, while persistent, does not necessarily portend eruptive activity. AVO plans to install two additional seismic stations on the volcano this week to more closely monitor the activity.



Iliamna is a deeply dissected stratovolcano located 225 km southwest of Anchorage in the Aleutian Range. The volcano is mostly covered with perennial snowfields and valley glaciers. No historic eruptive activity has been documented at Iliamna, however, a prominent fumarole field located near the summit frequently produces small steam plumes commonly visible from Anchorage and the Kenai Peninsula on clear days.



Seismic activity at Spurr, Redoubt, and Augustine volcanoes remains at normal background levels.



ADDITIONAL INFORMATION



AVO maintains a computerized alarm system capable of

notifying AVO seismologists during non-business hours should unusual seismic activity occur at Spurr, Redoubt, Augustine, or Akutan volcanoes.



AVO continues to test new seismic networks at Pavlof, Dutton, Makushin, Akutan, and Katmai area volcanoes. Reports on these volcanoes will be added to the AVO weekly update as data acquisition and analysis become reliable. We anticipate that this will occur by mid-November.

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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