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ImageDetailsVolcanoesKeywords
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Caption:Incandescence visible inside a ~5-10-m diameter hole in the bottom of the summit crater at Cone A, Okmok Caldera.
Date:September 6, 2004 12:00 AM
Photographer:Neal, C. A.
OkmokCinder cone
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Caption:Aerial view into the summit crater of Korovin. This level of fumarolic emission from the slightly oblong, 60–90 m (200–300 ft) diameter, sheer-walled orifice at the bottom of the crater is apparently fairly typical and can account for the periodic observations of plumes from Atka Village. At times, a shallow body of gray, turbid water partially fills the inner crater and, in 2004, was observed roiling. Phreatic explosions from this water-rich, high-temperature system may be responsible for the occasional localized ash-fall deposits seen on the upper flanks of Korovin. Photograph by R.G. McGimsey, AVO/USGS, July 19, 2004.
Date:September2004 12:00 AM
Photographer:McGimsey, R. G.
KorovinCaldera/crater, Steam, Stratovolcano, Tephra, Volcano
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Caption:Chiginagak Volcano as viewed from a tent camp on Nakalilok Bay, 12 miles to the south, late-September 2004.
Date:September2004 12:00 AM
Photographer:Schwausch, Rus
ChiginagakStratovolcano
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Caption:Incandescent rock can be seen through the small circular vent at Cone A, Okmok Volcano.
Date:September2004 12:00 AM
Photographer:Schaefer, J. R. G.
Cone ACinder cone
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Caption:A small, valley-filling lahar deposit from Okmok Volcano forms a 3-meter high outcrop on the NW shore of Umnak Island. Site 04JRSOK002A.
Date:September2004 12:00 AM
Photographer:Schaefer, J. R. G.
OkmokDebris flow/mudflow/landslide/lahar
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Caption:Cone D in the caldera at Okmok Volcano. View is to the north.
Date:September2004 12:00 AM
Photographer:Schaefer, J. R. G.
Okmok, Cone DMaar/tuff cone/tuff ring
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Caption:Blocky aa lava flow in the foreground, and cliff-forming surge deposits from an intra-caldera tuff cone eruption in the background.
Date:September2004 12:00 AM
Photographer:Schaefer, J. R. G.
OkmokLava flow, Maar/tuff cone/tuff ring
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Caption:Steam and gas coming out of Cone A, the active vent of Okmok Volcano.
Date:August 31, 2004 11:50 AM
Photographer:Reyes, C. G.
OkmokCinder cone, Steam, Volcano
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Caption:Creating station OKSO (Okmok South). "Max in the mist" -- Nicole and Max cleaning out the drill hole during the installation of a permanent GPS station at OKSO.
Date:August 29, 2004 7:32 PM
Photographer:Reyes, C. G.
OkmokFieldwork operations, People in action, Seismic/GPS installation
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Caption:Creating station OKSO (Okmok South). Construction of station OKSO in full swing as we prepare to close up shop for the night. It's 7:30pm, fog is threatening, and we have to hope that we'll get the chance to plug it all together before we're forced to leave the island...
Date:August 29, 2004 7:21 PM
Photographer:Reyes, C. G.
OkmokFieldwork operations, People in action, Seismic/GPS installation
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Caption:Creating station OKSO (Okmok South). With the hut in place, the helicopter drops the hoist and heads off in search of the next load.
Date:August 29, 2004 7:21 PM
Photographer:Reyes, C. G.
OkmokFieldwork operations, People in action, Seismic/GPS installation
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Caption:Guy and Max Replacing a broken solar panel at station OKRE under typical Aleutian conditions.
Date:August 26, 2004 6:17 PM
Photographer:Reyes, C. G.
OkmokFieldwork operations, People in action, Seismic/GPS installation
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Caption:Snout of south glacier at head of tributary to Indecision Creek. Snout is thickly covered with hydrothermally altered debris erooded from core of volcano.
Date:August 25, 2004 12:00 AM
Photographer:Scott, W. E.
ChiginagakGlacier
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Caption:"Tape Applied to each Fuze". Hmm.. Well, the Island was an airforce base, once, and there are plenty of unaccounted for bits of unexploded ordinance.
Date:August 24, 2004 4:34 PM
Photographer:Reyes, C. G.
OkmokInfrastructure/ cultural
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Caption:August 24, 2004 fumarolic activity on the north flank of Chiginagak volcano at an elevation of approximately 6,000 feet.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakFumarolic activity
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Caption:August 24, 2004 fumarolic activity on the north flank of Chiginagak volcano at an elevation of approximately 6,000 feet.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakFumarolic activity
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Caption:Ice-free knob on the southeast flank of Chiginagak Volcano at an elevation of approximately 5600 feet. Sample site 04JSCH012.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakFieldwork operations, Lava flow
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Caption:Willie Scott sampling lava at site 04JSCH012, southeast side of Chiginagak Volcano, at an elevation of approximately 5600 feet; view to the southeast.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakLava flow
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Caption:August 24, 2004 fumarolic activity on the north flank of Chiginagak volcano at an elevation of approximately 6,000 feet.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakFumarolic activity
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Caption:August 24, 2004 fumarolic activity on the north flank of Chiginagak Volcano at an elevation of approximately 6,000 feet.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakFumarolic activity
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Caption:Banded rock at site 04JSCH016, an eroded dome? on the north flank of Chiginagak volcano at an elevation of approximately 4600 feet.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakDome, Lava flow
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Caption:View towards the summit of Chiginagak Volcano from sample sites 04JSCH016 - 020. Janet Schaefer in photo.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakFieldwork operations, Stratovolcano
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Caption:Toe of a young lava flow (sample 04JSCH025) at the head of Wandering Creek; view towards the northeast.
Date:August 24, 2004 12:00 AM
Photographer:Schaefer, J. R. G.
ChiginagakLava flow
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Caption:Fumarole on upper northeast flank.
Date:August 24, 2004 12:00 AM
Photographer:Scott, W. E.
ChiginagakFumarolic activity
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Caption:Fumarole on upper northeast flank.
Date:August 24, 2004 12:00 AM
Photographer:Scott, W. E.
ChiginagakFumarolic activity
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