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Caption:A helicopter sits on the shore of the western caldera lake at the base of the western caldera wall, just west of Turquoise Cone. Lava flows exposed in the cliff wall are the remnants of a pre-caldera stratocone destroyed in during the caldera-forming eruption 9,400 years ago.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Fisher, Turquoise coneCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Intermittent plumes of warm water stir sediment in the Western caldera lake, likely due to rising warm water. These plumes were observed in 2000 but were absent in 1999 and 2001. Mt. Finch is in the middle distance on the right. Shishaldin volcano is in the background.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Fisher, Finch, Mt, ShishaldinCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Turquoise cone, looking to the south. In the foreground is the western caldera lake, and the snow-crested ridge in the middle distance is the southern caldera rim. The collapse of Turquoise Cone removed more than half of the original stratocone, based on extrapolation of deposits in the existing edifice.
Date:2000 12:00 AM
Photographer:Gardner, J. E.
Fisher, Turquoise coneCaldera/crater, Hot Springs, Lake, Volcano
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Caption:View of the southwestern caldera from near the summit of Mt. Finch. The ridge in the middle distance is the southwestern caldera wall. On the far left is the southern outflow canyon, the only drainage flowing out of the caldera. Light colored deposits are hydrothermally altered pumice and lithics from an eruption of Turquoise Cone (to the right). Westdahl volcano is in the background (far right).
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Fisher, Finch, Mt, WestdahlCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Looking north along the eastern caldera rim on top of the caldera wall. Horizontal deposits exposed in the cliff wall are remnants of a pre-caldera stratocone. The undulating unit capping the wall is the welded pyroclastic flow deposit from the caldera-forming eruption, locally as thick as 5 meters, with pumice fall deposits from the same eruption directly beneath the welded unit. Highly tilted rocks in the left foreground are phreatomagmatic surge deposits from post-caldera eruptions beneath the eastern caldera lake.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Aerial view of the eastern wall of Fisher caldera. The field of view is about 4 kilometers. The eastern caldera lake is in the foreground, and the low areas outside the eastern caldera are in the background. Horizontal deposits exposed in the cliff wall are remnants of a pre-caldera stratocone. The undulating unit capping the wall is the welded pyroclastic flow deposit from the caldera-forming eruption, locally as thick as 5 meters, with pumice fall deposits from the same eruption (up to and exceeding 10 m thick) lie directly beneath the welded unit
Date:2000 12:00 AM
Photographer:Stelling, P. L.
FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Mt. Finch, the most recently active vent at Fisher volcano. Brightly colored areas are regions of hydrothermal alteration caused by fumarolic activity. The eastern caldera rim can be seen it the background as a subtle dark ridge. Light colored areas just inside the eastern caldera wall are phreatomagmatic surge deposits that cap prominent topographic features in the area. View is to the east.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Finch, Mt, FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Looking west over the southwest caldera floor at one of the pre-caldera stratocones partially destroyed in the caldera-forming eruption 9,400 years ago. The southern flanks of Turquoise Cone are seen on the right. The low bench in the middle of the image may be the portions of Turquoise Cone that developed below the surface of the intra-caldera lake.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Fisher, Turquoise coneCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Looking northwest from south caldera rim across the southern caldera floor to the drainage from Turquoise Lake. Eickelberg Peak is in the background on the right. The collapsed remains of Turquoise Cone are just out of the image on the left.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Eickelberg Peak (Cone 8), FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Looking north over the northern caldera wall. The light tan portion of the wall has been altered to clay, likely due to older fumarolic activity, similar to what is seen today on Mt. Finch ~5 km to the south. The dark areas in the foreground are basaltic scoria deposits from a cinder cone just outside the field of view to the west (left). The stream valleys empty into the western caldera lake.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Looking south at the southern caldera rim from above Turquoise Cone. This prominent portion of the southern caldera wall represents a pre-caldera stratocone that was almost entirely destroyed in the caldera-forming eruption 9,400 years ago. The stream in the middle ground drains the southern half of the caldera, flowing southwest (right) through the southern outflow canyon, a 100-m deep, 500-m wide break in the caldera wall.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Fisher, Turquoise coneCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Just south of the southeastern caldera rim looking west across the southern caldera wall of Fisher volcano. AVO scientist Dr. Jim Gardner investigates an older basaltic lava flow. The low area on the right is the southern caldera floor, and the snow-free peak on the right is one of the stratocones partially destroyed in the caldera-forming eruption 9,400 years ago. The snow covered peaks in the background are Westdahl (left) and Faris Peak.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
Faris Peak, Fisher, WestdahlCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Deposits from the caldera-forming eruption 9,400 years ago, about 5 kilometers outside the eastern caldera wall. AVO scientist Dr. Jim Gardner stand at the base of ~6.5 meters of pumice fall, capped by ~2.5 m of densely welded pyroclastic flow material. Additional pyroclastic flow material above is obscured by slope wash.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Deposits from the caldera-forming eruption 9,400 years ago, about 5 kilometers outside the eastern caldera wall. AVO scientist Dr. Jim Gardner stands near the base of ~6.5 meters of pumice fall, capped by ~2.5 m of densely welded pyroclastic flow material. Additional pyroclastic flow material above is obscured by slope wash. In the foreground is the top of the welded portion of pyroclastic flow deposit.
Date:2000 12:00 AM
Photographer:Stelling, P. L.
FisherCaldera/crater, Hot Springs, Lake, Volcano
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Caption:Scenic view of Rainbow River Cone. Photo courtesy of Wes Hildreth/USGS.
Date:2000 12:00 AM
Photographer:Hildreth, E. W.
Rainbow River coneCinder cone, Volcano
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Caption: Aerial photo of the North flank and rim of Aniankchack. Photo courtesy of Tina Neal, USGS.
Date:2000 12:00 AM
Photographer:Neal, C. A.
AniakchakVolcano, Caldera/crater
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Caption: Pavlof 1996. Fumarolic activity during September 1996 eruption. Photograph courtesy of Brenda Eliason.
Date:September 23, 1999 12:00 AM
Photographer:Eliason, Brenda
PavlofVolcano, Fissure/ ground crack, Fumarolic activity, Eruption cloud/ plume/ column
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Caption:Summit crater of Mount Martin, Katmai National Park and Preserve, as photographed from a fixed-wing aircraft. Fumaroles in the summit crater are the source of a persistent gas plume that is often visible far downwind on (rare) clear days.
Date:September1999 12:00 AM
Photographer:Adleman, Jennifer
MartinFumarolic activity, Lake, Steam, Volcano
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Caption:Novarupta Dome, upper Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska. The 380-m-wide rhyolite lava dome marks the center of the vent of the great eruption of 1912, and formed in the weeks to months following the June 6-9 explosive eruption. The vent itself is roughly 2 km wide and was backfilled by welded ash-flow tuff and fallback ejecta during the eruption.
Date:September1999 12:00 AM
Photographer:Adleman, Jennifer
NovaruptaCaldera/crater
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Caption:Novarupta in the Valley of Ten Thousand Smokes, Katmai National Park and Preserve. Taken from fixed-wing aircraft.
Date:September1999 12:00 AM
Photographer:Adleman, Jennifer
NovaruptaCaldera/crater, Dome, Pyroclastic flow, Volcano
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Caption:Roundtop as viewed from False Pass 1998. Photograph courtesy of Game McGimsey.
Date:August 24, 1999 12:00 AM
Photographer:McGimley, Game
RoundtopStratovolcano, Volcano
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Caption:Top of Mt. Griggs, Katmai National Park and Preserve.
Date:August1999 12:00 AM
Photographer:Adleman, Jennifer
GriggsVolcano
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Caption:Fumaroles at Kukak volcano, Alaska.
Date:July 31, 1999 12:00 AM
Photographer:Fierstein, J. E.
KukakVolcano, Glacier, Fumarolic activity
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Caption:Fumarolic activity at Kukak volcano, Alaska.
Date:July 31, 1999 12:00 AM
Photographer:Fierstein, J. E.
KukakVolcano, Fumarolic activity
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Caption:Fumaroles on Kukak volcano, Alaska.
Date:July 31, 1999 12:00 AM
Photographer:Fierstein, J. E.
KukakVolcano, Glacier, Fumarolic activity
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