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Archived Report
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Tuesday, January 10, 2006 4:20 PM AKST (120 UTC)




MARTIN VOLCANO (CAVW#1102-14-)

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

Current Level of Concern Color Code: YELLOW



The Alaska Volcano Observatory (AVO) has detected a marked increase in

earthquake activity beneath Mount Martin volcano. The increased earthquake

activity began on January 8 and continues. The number of located events is

roughly 300 in the last two days. This is in contrast to the background

rate of about 25 earthquakes per month on average since the seismic network

was installed in 1996. In response to these changes AVO is increasing the

level of concern color code to YELLOW. Swarms of earthquakes of this nature

are common at volcanoes such as Martin and do not suggest that eruptive

activity is imminent. Satellite data show nothing unusual, although

steaming is frequently observed at the volcano.



AVO will continue to monitor the activity at Martin volcano closely.



Mount Martin is a small, young volcano that lies just to the southwest of

Mageik volcano in Katmai National Park, approximately 295 miles (475 km)

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 1000 ft (300 m) in diameter, has a

series of vigorous 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 (900 m) above its summit. In addition to the summit cone, there is a series of thick lava flows that flowed

north and northwest, the oldest of which were emplaced prior to ~6,000

years ago. At least 3 eruptive episodes, each years to decades long,

separated by a few hundred to approximately 1,000 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



Steve McNutt, Acting Coordinating Scientist, UAF-GI

steve@giseis.alaska.edu (907) 474-7131



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
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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