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Okmok volcano, Aleutian Islands, Alaska, explosively erupted over a five-week period between July 12 and August 23, 2008. The eruption was predominantly phreatomagmatic, producing fine-grained tephra that covered most of northeastern Umnak Island. The eruption had a maximum Volcanic Explosivity Index (VEI) of 4, with eruption column heights up to 16 km during the opening phase. Several craters and a master tuff cone formed in the caldera as a result of phreatomagmatic explosions and accumulated tephra-fall and surge deposits. Ascending magma continuously interacted with an extensive shallow groundwater table in the caldera, resulting in the phreatomagmatic character of the eruption. Syneruptive explosion and collapse...
Tags: Active Volcanoes,
Aleutian Arc,
Aleutian Islands,
Ash Cloud,
Ash Fall, All tags...
Caldera,
Cone A,
Cone B,
Cone C,
Cone D,
Cone E,
Cone F,
Cone G,
Cone H,
Cone I,
Cone J,
Fort Glenn,
Geologic Hazards,
Geomorphology,
Geothermal,
Groundwater,
Heat Flow Study,
Historic Eruption,
Lahar,
Lahar Runout Flow,
Lake Level,
Okmok,
Okmok Caldera,
Okmok Hot Springs,
Okmok Volcano,
Okmok, Mount,
Stratigraphy,
Surface Water,
Tephra,
Umnak Island,
Umnak Quadrangle,
Unalaska Quadrangle,
Volcanic Ash,
Volcanic Eruption,
Volcaniclastics,
Volcanology,
geoscientificInformation, Fewer tags
This publication contains previously unpublished geochemical analyses or re-analyses of lavas, magmatic inclusions, and a few gabbroic cumulate inclusions from Alaska volcanoes (Akutan, Augustine, Buzzard Creek, Dana, Douglas, Fourpeaked, Frosty, Great Sitkin, Iliamna, Kaguyak, Kiska, Okmok, Prindle Cone, Recheshnoi, Redoubt, Spurr, Ukinrek Maars, Vsevidof, Westdahl, Wrangell) collected by the authors and others over the past 35 years. It provides substantial data sets for three volcanoes (Vsevidof, Westdahl, and Douglas) for which little or no published data exist. All analyses were made by the GeoAnalytical laboratory at Washington State University in Pullman, WA. The ICP/MS data have been reduced using the 2006...
Tags: Adagdak,
Adak,
Akutan,
Analyses,
Analyses and Sampling, All tags...
Analytical Lab Results,
Analytical Results,
Augustine,
Augustine Volcano,
Basalt,
Bedrock,
Bogoslof,
Chemistry,
Colorado Creek,
Crater Peak,
Crystals,
Douglas,
Faris Peak,
Fourpeaked,
Frosty,
Frosty Peak,
Geochemical Data,
Geochemistry,
Geochronology,
Geologic,
Geology,
Glacier Creek,
Hayes,
Hazards,
Ice,
Iliamna,
Iliamna Volcano,
Jag Peak,
Juneau,
Kaguyak,
Kansas Creek,
Kasatochi,
Katmai,
Kiska,
Maars,
Mount Douglas,
Mount Peulik,
Mount Recheshnoi,
Mount Spurr,
Mount Wrangell,
Mount Zanetti,
Nikolski,
Okmok,
Okmok Caldera,
Pavlof,
Prindle Volcano,
Redoubt,
Redoubt Volcano,
Rhyolite,
Rocks,
Sample Location,
Spurr,
Tanana,
Tephra,
The Sisters,
Ukinrek,
Ukinrek Maars,
Uliaga,
Umnak Island,
Unimak,
Volcanic,
Volcanic Arc,
Volcanic Rocks,
Volcanoes,
Volcanology,
Vsevidof,
Westdahl,
Whittier,
Wrangell,
Yakutat,
geoscientificInformation, Fewer tags
This dataset consists of the vector digital GIS files that were used to create sheet 1 of the "Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska" (DGGS RI 2004-3). The map area is centered around Okmok Volcano, on eastern Umnak Island. The data includes volcano-hazard zones for ballistics, ash accumulation, pyroclastic flows, floods and lahars, and debris avalanches. Also included in the dataset are roads, trails, seismic station locations, continuous GPS station locations, creeks, and the location of the Fort Glenn airstrip.
Tags: Aleutian Arc,
Aleutian Islands,
Fort Glenn,
Fox Islands,
Okmok Caldera, All tags...
Okmok, Mount,
Umnak Island,
Volcanoes,
geoscientificInformation, Fewer tags
In response to significant morphologic changes in Okmok Caldera due to the phreatomagmatic eruption of Okmok volcano in 2009, a new digital elevation model was acquired to document and quantitatively assess the new volcanic features and altered hydrology within the caldera. This DEM dataset provides elevation data derived from a stereo pair of Worldview-1 satellite images acquired on January 21, 2010. In addition to the DEM, a shaded-relief image is also provided for easy visualization of the data.
This shaded relief image of Okmok Volcano serves as the basemap for sheet 1 of the "Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska" (DGGS RI 2004-3). The map area is centered around Okmok Volcano, on eastern Umnak Island. SRTM and AirSAR DEM datasets were combined in ArcGIS to produce a georeferenced shaded relief TIFF image of Okmok Volcano.
Tags: Aleutian Arc,
Aleutian Islands,
Fort Glenn,
Fox Islands,
Okmok Caldera, All tags...
Okmok, Mount,
Umnak Island,
Volcanoes,
geoscientificInformation, Fewer tags
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