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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Friday, January 27, 2006 12:55 PM AKST (2155 UTC)




MARTIN VOLCANO (CAVW#1102-14-)

58.1722°N 155.3611°W, Summit Elevation 6102 ft (1860 m)

Current Level of Concern Color Code: GREEN

Previous Level of Concern Color Code: YELLOW



The level of seismic activity at Martin volcano has diminished over the past several days and has returned to background levels. Clear views of the volcano in satellite images showed no signs of unusual activity over the past week. We are thus changing the Level of Concern Color Code for Martin from YELLOW to GREEN.



Mount Martin is a small, young volcano that lies just to the southwest of Mageik volcano in Katmai National Park, approximately 475 km (295 miles) southwest of Anchorage. Martin's summit cone sits at an elevation of roughly 6,100 ft (1860 m), perched atop a high ridge of older rock. A summit crater, approximately 300 m in diameter, is home to a series of vigourous steam jets (fumaroles) that emit sulfur-rich volcanic gases; the crater also contains an ephemeral crater lake. No historical eruptions of Mount Martin are known, but Martin's vigorous fumaroles can send prominent steam plumes as high as 3,000 ft above its summit. In addition to the summit cone is a series of thick lava flows that flowed north and northwest, the oldest of which were emplaced prior to about 6,000 years ago. At least 3 eruptive episodes, each years or decades long, separated by several thousand years to about 1000 years, built Mount Martin over a period of several millennia.



ABBREVIATED COLOR CODE KEY (contact AVO for complete description):

GREEN volcano is dormant; normal seismicity and fumarolic activity occurring

YELLOW volcano is restless; eruption may occur

ORANGE volcano is in eruption or eruption may occur at any time

RED significant eruption is occurring or explosive eruption expected at any time



VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu

RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478



CONTACT INFORMATION:

Tom Murray, Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



John Eichelberger, Coordinating Scientist, UAF-GI

eich@gi.alaska.edu (907) 474-5530 OR (907) 590-8247



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].

PDF version of these definitions
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Page modified: May 27, 2014 10:23
Contact Information: AVO Web Team

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