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ImageDetailsVolcanoesKeywords
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Caption:Beautiful view of Cleveland (center, steaming), Carlisle (rear right) and Herbert (rear left) this morning from the CLCO webcam, March 12, 2015.
Date:March 12, 2015 10:04 AM
Photographer:Cleveland CLCO webcam
ArraySteam
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Caption:Satellite image showing resuspended ash from the Katmai 1912 eruption blowing southeast over Shelikof Strait on March 11, 2015. Satellite image from NOAA AVHRR satellite.
Date:March 11, 2015 5:48 AM
Photographer:Waythomas, C. F.
Katmai, NovaruptaTephra
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Caption:Composite Landsat-8 image of Veniaminof Volcano collected on February 28, 2015. The grey scale base image is from the 15-meter-resolution "Panchromatic" band that records visible light. Superimposed onto it (in color) are short-wave infrared data that are sensitive to high temperatures. These data show high surface temperatures, expressed as radiance values (a measure or thermal emission), confined to the summit crater of the intracaldera cone. These areas of elevated surface temperatures are typical for Veniaminof during non-eruptive periods. The surface expression of the lava flows produced during the 2013 eruption are seen as depressions in the snow cover on the south and east sides of the cone. A faint shadow from steam emissions can be seen over the summit icefield to the southeast of the cone, although the emissions themselves are not readily visible.
Date:February 28, 2015 9:40 PM
Photographer:Schneider, D. J.
VeniaminofFumarolic activity, Volcano
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Caption:Ash from Shiveluch volcano in Russia’s Kamchatka peninsula crossed the Bering Sea Saturday, February 28, 2015, and caused flight cancellations in western Alaska. The ash cloud is the linear blue feature seen in this image derived from NOAA satellite data. The ash cloud was tracked by the Tokyo and Anchorage Volcanic Ash Advisory Centers, which are responsible for forecasting the movement of potentially hazardous ash cloud. These forecasts provide the details for the issuance of warning messages. In Alaska, the National Weather Service Alaska Aviation Weather Unit issues ash warning messages.
Date:February 28, 2015 8:53 AM
Photographer:Alaska Volcano Observatory
ArrayEruption cloud/ plume/ column, Tephra
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Caption:Steaming from the summit of Shishaldin volcano, February 27, 2015. Photo taken 45 miles NNW of the volcano from a ship in the Bering Sea.
Date:February 27, 2015 6:31 PM
Photographer:Musselwhite, Levi
ShishaldinSteam
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Caption:Looking closely at the intracaldera cone (visible just to the left of the tower in this image), a low-level degassing plume is visible at Veniaminof. Photo from the FAA Perryville webcam, February 25, 2015.
Date:February 25, 2015 2:09 AM
Photographer:FAA Perryville NW webcam
VeniaminofSteam
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Caption:Here's a helpful picture for thinking about the size of earthquakes. We usually talk about the amount of energy released in an earthquake as the "earthquake magnitude (M)". But, earthquake magnitude is on a logarithmic scale. That means a M2 earthquake releases as much energy as about 32 M1 earthquakes. Likewise, about 32 M2 earthquakes release the energy of one M3 earthquake. Now consider that a M3 earthquake releases about 1000 times the energy of a M1. As you go up the magnitude scale the numbers get gigantic - one billion M1 earthquakes release the energy of a M7 earthquake! Volcanic earthquakes tend to be really small, usually less than M3. But remember, if a volcano usually has only M1 earthquakes, and then has a M2 - this volcano has released about 32 times more energy than usual. This is why AVO seismologists closely watch even the smallest earthquakes to look for changes at a volcano.
Date:February 25, 2015 12:00 AM
Photographer:Buurman, Helena
ArrayVolcano
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Caption:Happy Valentine's Day from seismic stations MTBL, MNAT, MREP, MCIR, MGOD, and MSW on Makushin Volcano, Alaska.
Date:February 14, 2015 12:00 AM
Photographer:Anonymous
MakushinVolcano
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Caption:This is a long-period horizontal seismometer, likely built for the World Wide Standard Seismological Network (WWSSN) in the early 1960s. The WWSSN was designed to detect underground nuclear tests. Further information about this type of instrument can be found at the Smithsonian's National Museum of American History (http://americanhistory.si.edu/collections/search/object/nmah_1445876 ).
Date:February 11, 2015 1:43 PM
Photographer:Cameron, C. E.
ArrayJust for fun
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Caption:Here’s an example from Monday, February 9, 2015, of what “elevated seismicity” or tremor can look like at Shishaldin. In this spectrogram, warmer colors mean stronger signal. Shishaldin sometimes produces small puffs of ash, that can be seen in the seismic record as an increase in tremor. Other times the tremor will increase without any eruptive activity. Satellite and camera images help verify whether any ash was erupted. Figure courtesy of Helena Buurman, UAFGI.
Date:February 10, 2015 12:00 AM
Photographer:Buurman, Helena
ShishaldinVolcano
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Caption:Small, low-level ash emission from the summit of Shishaldin Volcano, February 2, 2015.
Date:February 2, 2015 10:31 AM
Photographer:USGS Shishaldin webcam
ArrayTephra
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Caption:Worldview satellite image overlain over topography showing Semisopochnoi on January 30, 2015. The three prominent craters in the center belong to Mount Cerberus (named for the three-headed dog in Greek and Roman mythology); the peak behind and to the right of Cerberus is Anvil Peak. Sugarloaf Peak is in the foreground, just left of center. View is from the southeast.
Date:January 30, 2015 12:00 AM
Photographer:Schneider, D. J.
SemisopochnoiVolcano
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Caption:Cleveland volcano remains active. In this perspective Landsat-8 satellite image view, shortwave-infrared data is overlain on visible wavelength data. Colors show the location of elevated surface temperatures in the summit crater due to the presence of a small lava dome or plug.
Date:January 5, 2015 12:00 AM
Photographer:Schneider, D. J.
ClevelandDome, Volcano
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Caption:Location map of Pavlof Volcano showing location of seismic network and place names.
Date:2015 12:00 AM
Photographer:waythomas, chris
Emmons Lake Volcanic Center, Pavlof, Pavlof SisterCaldera/crater, Cinder cone, Stratovolcano
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Caption:401 earthquakes were located at Geyser Bight in 2014. The largest earthquake was a magnitude 3.1 (shown by the star), occurring on the eastern flank of Recheshnoi within a swarm of activity in September 2014 (yellow symbols). Two identified swarms occurred in the hot springs area in October (orange symbols) and late November (red symbols). Earthquake hypocenters are colored by time of occurrence - see scale at bottom of image.
Date:December 31, 2014 12:00 AM
Photographer:Dixon, Jim
RecheshnoiSeismic/GPS installation
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Caption:Real-time seismic amplitude (RSAM) time series for Veniaminof seismic station VNWF, located on the lower southwestern flank of the caldera. Plot runs from June 2013 through December 2014 and shows the seismic energy release associated with 2013 eruption and the gradual decline in seismicity beginning in late October 2013. Several episodes of increased low-frequency events and tremor bursts occurred from mid-July to end of the year (e.g. July 15, Oct. 8, and Dec. 18); however, these were not associated with any eruptive activity and may have reflected continued degassing of the system.
Date:December 31, 2014 12:00 AM
Photographer:McGimsey, Game
VeniaminofSeismic/GPS installation
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Caption:Evidence of a visitor to CLCO on Chuginadak Island: fox tracks in the fresh snow.
Date:December 27, 2014 2:03 PM
Photographer:Cleveland, Concord
ClevelandJust for fun
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Caption:Akutan volcano's caldera and intracaldera cone, as seen from the air, looking to the southeast. The Alaska community of Akutan lies about 9 miles northeast, and is not visible in this photograph.
Date:December 5, 2014 5:28 PM
Photographer:MacPherson, Amy
AkutanCaldera/crater, Volcano
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Caption:Pavlof volcano steaming, as viewed from Nelson Lagoon, December 5, 2014. Photo courtesy of Merle Brandell.
Date:December 5, 2014 12:00 AM
Photographer:Brandell, Merle
PavlofFumarolic activity, Lava flow
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Caption:Pavlof volcano with steam rising from the 2014 vent region, as viewed from Nelson Lagoon, December 5, 2014. Pavlof Sister is the lower peak in front of Pavlof. Photo courtesy of Merle Brandell.
Date:December 5, 2014 12:00 AM
Photographer:Brandell, Merle
PavlofFumarolic activity, Lava flow
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Caption:Pavlof volcano steaming, as viewed from Nelson Lagoon, December 5, 2014. Photo courtesy of Merle Brandell.
Date:December 5, 2014 12:00 AM
Photographer:Brandell, Merle
PavlofFumarolic activity, Lava flow
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Caption:Pavlof Volcano, December 5, 2014. Photo courtesy of Royce Snapp.
Date:December 5, 2014 12:00 AM
Photographer:Snapp, Royce
PavlofFumarolic activity, Lava flow
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Caption:Pavlof volcano steaming, as viewed from Nelson Lagoon, December 5, 2014. Photo courtesy of Merle Brandell.
Date:December 5, 2014 12:00 AM
Photographer:Brandell, Merle
PavlofFumarolic activity, Lava flow
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Caption:Pavlof volcano, earthshadow, and almost-full moon, December 4, 2014. Photo courtesy of Royce Snapp.
Date:December 4, 2014 12:00 AM
Photographer:Snapp, Royce
PavlofStratovolcano, Volcano
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Caption:Steam rises from the summit of Shishaldin volcano on the evening of December 3, 2014. View is to the south. Photo taken by Levi Musselwhite, aboard a boat in the Bering Sea, approximately 75 miles north of Shishaldin.
Date:December 3, 2014 6:47 PM
Photographer:Musselwhite, Levi
ShishaldinEruption cloud/ plume/ column
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Page modified: May 14, 2014 14:08
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