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The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS).
Restless Volcanoes
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Cleveland volcano:
Aviation Color Code - YELLOW
Volcano Alert Level - ADVISORY
Full details ...

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Shishaldin volcano:
Aviation Color Code - ORANGE
Volcano Alert Level - WATCH
Full details ...

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Veniaminof volcano:
Aviation Color Code - YELLOW
Volcano Alert Level - ADVISORY
Full details ...

Ground-coupled airwaves and explosion signals at Shishaldin
Posted: April 10, 2014

seismic waveforms at Shishaldin

Over the past few weeks we've been seeing regular small explosions in the seismic record coming from Shishaldin's crater. Each explosion shows up as a low frequency seismic wave that travels through the ground, followed by a high frequency airwave pulse. The airwaves arrive later because energy from the explosion travels more slowly through the air than it does through the ground. While small explosions are often part of the background activity at Shishaldin, we haven't seen them showing up this clearly in the past 2 years. Elevated surface temperatures suggest there is fresh lava in the crater. Since the explosions were observed around the time that the lava was erupted into the crater, the two are probably closely related. We can't say whether the explosions are directly caused by the erupting lava, though, or whether they are just small puffs of gas coming from the crater floor.
Loss of Critical Volcano Monitoring Information in Alaska
Posted: February 10, 2014
The Alaska Volcano Observatory (AVO) has experienced numerous seismic station failures and our ability to monitor activity at some volcanoes has failed or is heavily impaired. For volcanoes with failed ground instrumentation networks, AVO is unable to (1) assess whether this volcano may be building towards an eruption and/or (2) quickly confirm or dismiss reports of activity. Because these volcanoes are no longer seismically monitored, they will move from volcano alert level Normal and Aviation Color Code Green to "unassigned". As at other volcanoes without real-time seismic networks, AVO will continue to use satellite and infrasound data, and reports from pilots and ground observers to detect signs of eruptive activity. We will update this news item with links to announcements of monitoring status changes as they occur.

Monitoring instruments at Aniakchak Volcano can no longer seismically monitor unrest at the volcano. The final Aniakchak station failure was confirmed on January 23. The Information Statement for Aniakchak is
here.

Monitoring instruments at Fourpeaked volcano can no longer seismically monitor unrest at the volcano. The Information Statement from February 7 that moved Fourpeaked to Unassigned is here.


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Last Activity Report
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ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
Friday, April 18, 2014 12:08 PM AKDT (Friday, April 18, 2014 20:08 UTC)


SHISHALDIN VOLCANO (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Elevated surface temperatures consistent with low-level eruptive activity in the summit crater were observed in satellite data earlier in the week during periods of clear weather. Small explosions continue to be observed in seismic data, but no ash emissions have been detected. Minor steaming observed in web camera images during clear periods over the past week.

Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 10 miles (16 km). A small summit crater typically emits a noticeable steam plume with occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including at least 24 confirmed eruptions since 1775. Most of Shishaldin's eruptions have consisted of small ash and steam plumes, although a recent eruption in April-May 1999 produced an ash column that reached a height of 45,000 ft above sea level.

VENIAMINOF VOLCANO (VNUM #312070)
56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismicity over the past weeks remains slightly above background. Web camera images during periods of clear weather show typical steaming from the previously active cone. Satellite images show weakly elevated surface temperatures consistent with cooling of the 2013 lava flows.

Mount Veniaminof volcano is an andesitic stratovolcano with an ice-filled 10-km diameter summit caldera located on the Alaska Peninsula, 775 km (480 mi) southwest of Anchorage and 35 km (22 mi) north of Perryville. Veniaminof is one of the largest (~ 300 cubic km) and most active volcanic centers in the Aleutian Arc and has erupted at least 13 times in the past 200 years. Recent significant eruptions of the volcano occurred in 1993-95 and 2005. Both were Strombolian eruptions producing lava fountans and minor emissions of ash and gas from the main intracaldera cone. During the 1993-95 activity, a small lava flow was extruded into the ice field producing a melt pit. Minor ash-producing explosions occurred nearly annually between 2002 and 2008. Previous historical eruptions have produced ash plumes that reached 6,000 m (20,000 ft) above sea level (1939 and 1956) and ash fallout that blanketed areas within about 40 km (25 mi) of the volcano (1939).

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

No activity observed in satellite data during clear periods over the past week.

Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. The last minor ash emission following an explosion was on Jan 2, 2014.

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

TELEPHONE RECORDING ON ALASKA VOLCANO STATUS (907) 786-7478

CONTACT INFORMATION:
John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymeuller, 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.
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URL: www.avo.alaska.edu/index.php
Page modified: January 28, 2014 16:27
Contact Information: AVO Web Team

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