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Caption:Patchy texture to tundra grass caused by ash fall of perhaps 1-2 inches south of Fort Glenn.
Date:September 13, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Lahar deposit in drainage south of Fort Glenn (visible at upper left as red buildings). Shiprock in the distance in Umnak Pass. Like most drainages coming off Okmok, this one formed a new delta in the ocean and cut the rough road around the south coast.
Date:September 13, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:2008 tephra fall units south of Tulik on the flank of Okmok. Wavy bedding in fine light ash layers is probably aeolian in origin as there is no evidence of surges traveling this far. The July 12 fall unit is not very coarse here, as we are south of the axis.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Close up of July 12 ash fall near the dock east of Fort Glenn ranch house. The light tan upper ash may be from post July 12 accumulation in part.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Fieldwork operations, Tephra, Volcano
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Caption:Coarse lapilli fall clasts at the ranch. This must be what Lonnie Kennedy described as 'ping pong balls' hitting them during their escape. These are moderately vesicular scoria clasts up to 2 cm across or so and here they collected in a large wooden box that had been undisturbed since the eruption.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Jessica standing beside the active Crater Creek drainage where it empties into the Bering Sea across a new delta of laharic debris. Note 3 m boulder across the channel. Finer grained material dominated the channel margins and the delta proper; we have some crude measurements of the delta size and wonder if it will last the winter.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:Hyperconcentrated deposits on the surface of the Crater Creek lahar channel margin near the Bering Sea delta. This fine-medium sandy unit sits atop a gravel-cobble lahar deposit. There were clearly multiple pulses of lahar down this drainage.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:2008 tephra fall units upslope from Kettle Cape on the south coast of the volcano. A rare sunny moment on the outcrop. Note aeolian reworked fine light ash near top.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Fieldwork operations, Tephra, Volcano
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Caption:Preparing to take a measured area sample on a board near the Ft. Glenn dock. Total thickness here about 1.5 cm.
Date:September 12, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Fieldwork operations, Tephra, Volcano
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Caption:Cabin in Crater Creek; the quonset hut roof was moved to its present position by floodwaters at some point after the eruption. We did not land here, but it appeared that a high-water/mud line was left several feet up the channel-facing cabin wall. A bridge that had previously crossed the creek here was gone. Note large boulders in central channel several meters across, probably reworked pre-historic flood deposits from upstream.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:Jessica Larsen and Max Kaufman atop Cone H.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano, Just for fun, People in action
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Caption:Image of the modified old Cone D lake. Water discoloration is probably the result of a small landslide or ash slump into the lake.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Jessica Larsen digs through 2008 tephra deposits to the pre-eruption snowpack. This location is between Cones C and F about 4 km SSW of the main 2008 vents. The section of new material is about 2 m thick here.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, People in action, Tephra, Volcano
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Caption:Deeply gullied terrain on the east and southeast sides of Cone D which slopes upward to the left. The old lake, now highly modified, is visible in the distance. These canyons were many meters to perhaps 15 meters deep in places and likely have downcut into pre-2008 pyroclastic deposits that were not well-exposed before the 2008 eruption.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:View downstream of the main Crater Creek drainage inside the caldera. Gates are around the corner at upper right. Cone B just visible in upper left.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:View looking downstream of Crater Creek inside the caldera. The weakly flowing channel in the middle ground is draining from the approximate position of the old lake while the wider braided channel in the distance emerges from beneath a thick pile of mostly pre-2008 tephra. Flow is much reduced from normal September conditions as water has been dammed by new ash deposits. Higher flows must have occurred to carry the larger (several m across) blocks of semi-consolidated tephra adjacent to the main channel. The Gates are out of this view to the upper right.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:Western margin of the new lake showing the exposed cliff of 1997 (?) lava that was likely truncated by an explosion through the caldera floor. The fan of debris extending into the lake at upper right (adjacent to a ridge extending into the lake) is carrying a lot of water and fine debris emanating from the base of the cliff and likely draining from the cone G lake on the other side of the lava flow lobe. Post explosion slumping may account for some of the lumpy terrain.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano, Lake, Lava flow
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Caption:Crater Creek lahar deposit delta and sediment plume into the Bering Sea. Shipwreck visible near the shoreline and left of the main central channel is 17 m long.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:Lahar deposit and new delta, few hundred meters wide, on northwest coast of Okmok.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:Caribou on lahar deposits southwest flank of Okmok.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Jessica Larsen and Max Kaufman pointing to the newest prominent vent feature in Okmok Caldera as seen from Cone H.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano, People in action, Just for fun
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Caption:Patchy ash fall (gray) on the southwest flank of Okmok.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Tephra, Volcano
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Caption:Tephra deposits plastered on a lithic block atop Cone H near the GPS site. The 2008 vents are to the right and about 5 km away.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Tephra deposits plastered on a lithic block atop Cone H near the GPS site. The 2008 vents are to the right and about 5 km away.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano
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Caption:Cliff face forming the western margin of the new lake, exposing the 1997 (?) lava flow in cross section.
Date:September 11, 2008 12:00 AM
Photographer:Neal, C. A.
OkmokCaldera/crater, Debris flow/mudflow/landslide/lahar, Fieldwork operations, Maar/tuff cone/tuff ring, Tephra, Volcano, Lake, Lava flow
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