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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 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
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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