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ImageDetailsVolcanoesKeywords
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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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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, C. F.
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:Clear weather conditions last week prompted a number of keen-eyed observers to share photos of fumarolic plumes at the Katmai group volcanoes. This is a 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
ArrayFumarolic activity
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