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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
Cleveland
Color Code YELLOW / Alert Level ADVISORYvolcano image
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Semisopochnoi
Color Code ORANGE / Alert Level WATCHvolcano image
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Shishaldin
Color Code ORANGE / Alert Level WATCHvolcano image
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Veniaminof
Color Code YELLOW / Alert Level ADVISORYvolcano image
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NEWS
New publication: Alaska Volcano Observatory geochemical database, version 2
Posted: July 26, 2019

K Wallace selecting Akutan tephras for analysis
The first release of the Alaska Volcano Observatory Geochemical Database (Cameron and others, 2014), included station and sample metadata for published Quaternary volcanic samples in Alaska and their whole-rock analytical values. Version 2 adds separate categories of data for tephra glass and groundmass glass analyses. Tephra (in this dataset, generally volcanic ash, although the definition of tephra includes all pyroclastic material) deposits can be preserved in the geologic record at both proximal and distal locations, with the deposit thickness and area dictated by the eruption size and wind directions at the time of eruption. As markers of previous explosive activity, tephra deposits provide a crucial record of prehistoric and modern eruptions. Correlating tephra deposits across Alaska and the northern hemisphere requires an understanding of their age, chemistry, and character. Such information has been reported in publications spanning numerous research disciplines over the past decades. Tephra data in particular are a key component in understanding the process, magnitude, and frequency of volcanic eruptions, and improve ashfall hazard assessments and ashfall modeling efforts. In addition, tephrostratigraphy is an integral part of linking marine, lacustrine, and terrestrial records critical to paleoclimate and archaeological research. The compilation and storage of tephra metadata and analytical data is a joint effort between the Alaska Volcano Observatory (AVO) staff at the Alaska Division of Geological & Geophysical Surveys (DGGS) and the U.S. Geological Survey Alaska Tephra Laboratory (USGS ATL).

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LAST ACTIVITY REPORT
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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Saturday, August 24, 2019, 12:48 PM AKDT (Saturday, August 24, 2019, 20:48 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

A low-level eruption continues at Shishaldin. Seismicity remains elevated with steady tremor recorded continuously over the past day. Weakly elevated surface temperatures were observed at the summit in one mostly cloudy satellite image overnight. Web camera views were obscured by clouds.

Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.


SEMISOPOCHNOI VOLCANO (VNUM #311060)
51°55'44" N 179°35'52" E, Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

A low-level eruption involving both steam and magma continues at Semisopochnoi. Seismic activity at Semisopochnoi has been elevated with unsteady tremor and low-frequency earthquakes over the past day. Ground-coupled airwaves, indicative of explosive activity, have been seen at times in seismic data. Infrasound associated with the explosive activity registered during the past 24 hours on an infrasound array located at Adak, approximately 250 km to the east of the volcano. Nothing significant was observed in cloudy satellite images.

Semisopochnoi is monitored with an on-island seismic network and remotely by satellite and lightning sensors. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if atmospheric conditions permit.


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

Nothing significant was observed in satellite images over the past day. No noteworthy seismicity has occurred at the volcano and no activity was detected in regional or local infrasound data during the last 24 hours.

Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently.

Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data.


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

Seismic unrest continues barely above background with occasional low-frequency earthquakes. Nothing significant observed in mostly clear satellite data and web camera views over the past day.

Veniaminof volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to a more significant explosive eruption. AVO combines seismic, infrasound, lightning, and satellite data for rapid detection of such events.


OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

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FOLLOW AVO ON TWITTER: https://twitter.com/alaska_avo

CONTACT INFORMATION:

Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

David Fee, Coordinating Scientist, UAFGI
dfee1@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.
NEWS

RUSSIAN VOLCANO INFORMATION

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Page modified: March 19, 2018 16:09
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