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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
Between 1979 and 1982, the Alaska Division of Geological & Geophysical Surveys (DGGS) and the Geophysical Institute, University of Alaska Fairbanks, undertook an assessment of the states geothermal resources under a program jointly sponsored by the U.S. Department of Energy and the State of Alaska. During this period, reconnaissance investigations of more than 100 thermal spring sites and fumarole fields located in Alaska were conducted by DGGS.
Tags: Active Volcanoes,
Adak Hot Springs,
Adak Quadrangle,
Akutan,
Akutan Volcano, All tags...
Akutan Volcano Hot Springs,
Alaska Peninsula,
Aleutian Arc,
Aleutian Islands,
Aleutian Peninsula,
Analyses,
Andrew Bay Hot Springs,
Andrew Bay Volcano,
Aniakchak,
Aniakchak Caldera,
Aniakchak Hot Springs,
Augustine,
Augustine Hot Springs,
Augustine Volcano,
Bailey Bay Hot Springs,
Baker Hot Springs,
Baranof Hot Springs,
Barnes Lake Hot Springs,
Bogoslof Hot Springs,
Bradfield Canal Hot Springs,
Cheeneetnuk Hot Springs,
Chemistry,
Chena Hot Springs,
Chetasline Vent,
Chief Shakes Hot Springs,
Chiginagak Hot Springs,
Chuginadak Hot Springs,
Chuilnuk Hot Springs,
Clear Creek Hot Springs,
Cold Bay Hot Springs,
Cook Inlet,
Copper Glacier Hot Springs,
Crater Peak Hot Springs,
Dall Hot Springs,
Dulbai Hot Springs,
Egg Island Hot Springs,
Emmons Lake Hot Springs,
Energy Resources,
Epithermal,
False Pass Hot Springs,
Fish Bay Hot Springs,
Fowler Hot Springs,
Fumarole Chemistry,
Gas Rocks Hot Springs,
Geochemistry,
Geologic,
Geologic Hazards,
Geologic Map,
Geology,
Geothermal,
Geyser Bight Hot Springs,
Glacier Valley Hot Springs,
Goddard Hot Springs,
Granite Mountain Hot Springs,
Great Sitkin Hot Springs,
Ground Water,
Ground Water Chemistry,
Hague Hot Springs,
Hawk Hot Springs,
Heat Flow Study,
Hornor Hot Springs,
Hot Springs,
Hot Springs Bay Hot Springs,
Hot Springs Cove Hot Springs,
Hot Springs Deposit,
Hutlinana Hot Springs,
Hydrothermal Deposit,
Iliamna Hot Springs,
Inmachuk Hot Springs,
Ishtalitna Hot Springs,
Kagamil Hot Springs,
Kanaga Hot Springs,
Kanuti Hot Springs,
Katmai Caldera,
Katmai Hot Springs,
Kenai Peninsula,
Kenmore Hot Springs,
Kilo Hot Springs,
Kiquga Hot Springs,
Kliuchef Hot Springs,
Korovin Hot Springs,
Kukak Hot Springs,
Kupreanoff Hot Springs,
Lava Creek Hot Springs,
Little Melozitna Hot Springs,
Little Sitkin Hot Springs,
Lower Division Hot Springs,
Lower Glacier Valley Hot Springs,
Lower Klawasi Hot Springs,
Lower Ray Hot Springs,
Mageik Creek Hot Springs,
Makushin,
Makushin Valley Hot Springs,
Makushin Volcano,
Manley Hot Springs,
Melozi Hot Springs,
Milky River Hot Springs,
Mineral Spring,
Mother Goose Hot Springs,
Mount Finch Hot Springs,
Mount Rynda Hot Springs,
Mount Spurr Hot Springs,
Mount Wrangell,
Mount Wrangell Crater,
Neka Bay Hot Springs,
North Peril Strait Hot Springs,
Nushkolik Mountain Volcanic Field,
Nylen Hot Springs,
Okmok Hot Springs,
Okmok Volcano,
Ophir Hot Springs,
Partov Cove Hot Springs,
Pavlof,
Pavlov Hot Springs,
Pilgrim Hot Springs,
Pogromni Hot Springs,
Port Moller,
Port Moller Hot Springs,
Red Hill Spring Hot Springs,
Redoubt,
Redoubt Volcano,
Reed Hot Springs,
Seguam Hot Springs,
Semisopochnoi Hot Springs,
Serpentine Hot Springs,
Seward Peninsula,
South Hot Springs,
Southcentral Alaska,
Southeast Alaska,
Southwest Alaska,
Summer Bay Hot Springs,
Sun Mountain Hot Springs,
Tatlawiksuk Hot Springs,
Thermal History,
Tolovana Hot Springs,
Tolovana Mining District,
Tunalkten Lake Hot Springs,
Twin Calderas,
Twin Lakes Hot Springs,
Ukinrek Hot Springs,
Upper Division Hot Springs,
Upper Glacier Valley Hot Springs,
Upper Klawasi Hot Springs,
Upper Ray Hot Springs,
Valley of Ten Thousand Smokes,
Volcanic Rocks,
Volcanoes,
Water Chemistry,
Well Chemistry,
Well Logs,
White Mountain Hot Springs,
White Sulfur Hot Springs,
Yukon-Kuskokwim Delta,
geoscientificInformation, Fewer tags
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