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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
Eruption cloud/ plume/ column, Tephra
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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". But earthquake magnitude is on a logarithmic scale. There is actually the energy of about 32 M1 earthquakes in one M2 earthquake. And the energy of 32 M2 earthquakes in one M3 earthquake...but because there is the equivalent energy of 32 M1 earthquakes for every M2 earthquake, there is actually the equivalent energy of 1,000 M1 earthquakes in a single M3 earthquake. As you go up the magnitude scale the numbers get gigantic - there is the equivalent energy of a billion M1 earthquakes in a M7 earthquake! Using the logarithmic magnitude scale makes discussion of earthquake sizes easier, although it sometimes masks the big differences between magnitudes. Volcanic earthquakes tend to be really small, usually less than M3. But remember, if a volcano usually has M1 earthquakes, and then has a M2 - it has released 32 times as much 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
Volcano
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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, Cheryl
Just 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,
Tephra
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Caption:Perspective satellite image view of Cleveland Volcano from the south. Data is from the Landsat-8 satellite. Base image is visible wavelength data and shortwave-infrared data is overlain in color showing 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, Dave
ClevelandDome, Volcano
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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, 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 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 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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Caption:Curious steam cloud over Shishaldin volcano (right). Isanotski volcano on left. Photo by Levi Musselwhite.
Date:December 3, 2014 6:45 PM
Photographer:Musselwhite, Levi
Isanotski, ShishaldinEruption cloud/ plume/ column
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Caption:Sunrise over Amak on December 3, 2014. Picture taken by Levi Musselwhite, 33 miles Northwest of Amak.
Date:December 3, 2014 11:13 AM
Photographer:Musselwhite, Levi
Amak
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Caption:Pavlof volcano emits a tiny puff of ash and steam on November 29, 2014. Photo taken and shared by Royce Snapp.
Date:November 29, 2014 4:30 PM
Photographer:Snapp, Royce
PavlofEruption cloud/ plume/ column, Glacier, Steam, Stratovolcano, Volcano
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Caption:Lava flows and lahar deposits on the northwest flank of Pavlof volcano. Photo taken approximately 50 miles WNW of Pavlof aboard a fishing vessel on the afternoon of November 26, 2014. Photo courtesy of Levi Musselwhite.
Date:November 26, 2014 2:08 PM
Photographer:Musselwhite, Levi
PavlofDebris flow/mudflow/landslide/lahar, Lava flow
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Caption:Annotated Terra-MODIS satellite image from November 25, 2014, showing both the new lava flow at Pavlof and a steam plume at Shishaldin.
Date:November 25, 2014 12:50 PM
Photographer:Waythomas, Chris
Pavlof, ShishaldinLava flow, Steam
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Caption:View from King Salmon, November 24, 2014, looking southeast, of a vigorous fumarolic plumes from Mount Martin. Martin has a long-lived, active fumarole field that often produces impressive steam plumes under optimal atmospheric conditions. Photo courtesy of Richard Russell.
Date:November 24, 2014 3:21 PM
Photographer:Russell, Richard
MartinFumarolic activity
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Caption:View from King Salmon, November 24, 2014, looking southeast, of a vigorous fumarolic plumes from Mount Martin. Martin has a long-lived, active fumarole field that often produces impressive steam plumes under optimal atmospheric conditions. Photo courtesy of Richard Russell.
Date:November 24, 2014 2:16 PM
Photographer:Russell, Richard
MartinFumarolic activity
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Caption:Photograph of Griggs volcano taken through a spotting scope from King Salmon, Alaska, about 60 miles northwest of the volcano. Circle highlights a vigorous, long-lived, high-temperature fumarole on the southwest flank of the volcano. It has been said that on calm days, the roar of this fumarolic jet can be heard from the valley floor.
Date:November 24, 2014 2:15 PM
Photographer:Russell, Richard
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Page modified: May 14, 2014 14:08
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