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This data lists the historically active volcanoes of Alaska and the year of the last major eruptive event. The volcanoes listed meet at least one of the following criteria since 1700 CE: (1) documented, unquestioned eruption, or (2) a strongly suspected eruption, often an eruption documented in the historical account with very little information (current geologic knowledge must not contradict the eruption account), or (3) persistent (usually on the order of decades, but certainly longer than several months) fumaroles, with temperatures (where measured) within ~10 degrees C of the boiling point, or (4) significant, measured, volcanic-related, non-eruptive deformation, (5) documented earthquake swarm with strongly...
Tags: Active Volcanoes,
Alaska Peninsula,
Alaska Statewide Maps,
Alaska, State of,
Aleutian Arc, All tags...
Aleutian Islands,
Coastal and River,
Coastal and River Hazards,
Geologic Hazards,
Geology,
Hazards,
Historic Eruption,
Volcanic,
Volcanic Eruption,
Volcano Hazards,
Volcanoes,
Volcanology,
geoscientificInformation, Fewer tags
Kasatochi is a small, isolated island volcano in the center of the Aleutian Island chain. It consists of a roughly circular cone approximately 3 km in diameter with a lake-filled central crater that is 1.2 km in diameter and extends from the highest point on the island to sea level. The oldest unit recognized is a thick series of mid-Pleistocene glaciovolcanic deposits consisting of autobrecciated lava, lahars, and volumetrically minor lava masses that we believe to have been emplaced underneath a regional ice cap. This unit is unconformably overlain by several massive Holocene lavas, above which lies a thick sequence of latest-Holocene pyroclastic deposits likely deposited during the crater-forming eruption. The...
Tags: Active Volcanoes,
Age Dates,
Aleutian Arc,
Aleutian Islands,
Alluvial Deposits, All tags...
Analyses,
Analyses and Sampling,
Basalt,
Bedrock,
Bedrock Geology,
Caldera,
Chemistry,
Colluvium,
Erosion,
Fan,
Geochemical Data,
Geochemistry,
Geochronology,
Geologic,
Geologic Hazards,
Geologic Map,
Geological Process,
Geology,
Geomorphology,
Hazards,
Historic Eruption,
Igneous,
Kasatochi,
Lava Flow,
Mineralogy,
Petrographic,
Petrography,
Petrology,
Pumice,
Pyroclastics,
Rockfall,
Rocks,
Sample Location,
Slope Instability,
Slump,
Soils,
Surface,
Surficial,
Talus,
Tephra,
Topography,
Ultramafic,
Uplift,
Volcanic,
Volcanic Ash,
Volcanic Eruption,
Volcanic Rocks,
Volcaniclastics,
Volcanoes,
Volcanology,
geoscientificInformation, Fewer tags
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
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 data lists the historically active volcanoes of Alaska, their location in latitude/longitude decimal degrees, and the year of the last major eruptive event. The 52 volcanoes listed meet at least one of the following criteria since 1700 CE: (1) documented, unquestioned eruption, or (2) a strongly suspected eruption, often an eruption documented in the historical account with very little information (current geologic knowledge must not contradict the eruption account), or (3) persistent (usually on the order of decades, but certainly longer than several months) fumaroles, with temperatures (where measured) within ~10°C of the boiling point, or (4) significant, measured, volcanic-related, non-eruptive deformation,...
The State of Alaska Division of Geological & Geophysical Surveys (DGGS) and Division of Oil & Gas (DOG) are currently engaged in a multi-year study of the hydrocarbon potential of the Tertiary and Mesozoic strata in Cook Inlet basin. Modal analyses and routine core analyses were performed on Tertiary and Mesozoic siltstones and sandstones collected during the 2007-2010 field seasons from six geographic areas in upper and lower Cook Inlet. The reservoir quality of Cook Inlet sandstones varies widely depending on their mineralogy, geologic age, burial depth, and depositional environment. Tuxedni and Naknek sandstones have poor reservoir quality and are likely to be of equally poor quality down dip. West Foreland sandstones...
Tags: Aleutian Arc,
Beluga Basin,
Bluff Point,
Capps Glacier,
Chert, All tags...
Chuitna River,
Clam Gulch,
Cook Inlet,
Cook Inlet Basin,
Diagenesis,
Falls Creek,
Feldspar,
Fritz Creek,
Graywacke,
Homer,
Iniskin Bay,
Iniskin Peninsula,
Kachemak Bay,
Kaguyak,
Matanuska Valley,
Mineralogy,
Oil Basins,
Oil and Gas,
Oil and Gas Basin,
Outcrop Samples,
Permeability,
Petrographic,
Petrography,
Petroleum Basin Study,
Petrology,
Porosity,
Provenance,
Pyroclastic Fall,
Pyroclastic Flow,
Quartz,
Reservoir,
Reservoir Evaluation,
Reservoir Quality,
Resource Assessment,
Saddle Mountain,
Sample Location,
Sample Location Map,
Sand,
Sand and Gravel,
Sediment Transport,
Sedimentary,
Sedimentary Rocks,
Sedimentation,
Sedimentology,
Seward Peninsula,
Southcentral Alaska,
Straight Creek,
Tectonics,
Thin Section,
Tyonek,
Tyonek Quadrangle,
Volcanic,
Volcanic Ash,
Volcaniclastics,
Zeolites,
geoscientificInformation, Fewer tags
The 2009 eruption of Redoubt Volcano included 19 major tephra-producing explosions. Mass per unit area (MPUA) ash fall sampling of the resulting deposits allowed us to create isomass contours of the ash fall. This dataset contains the vector digital shapefiles of the ash fall contours for the explosive events. In addition, a point digital shapefile is included that describes more than 400 ash fall samples that were collected. For a detailed account of the 2009 eruption of Redoubt Volcano, see Schaefer, J.R., ed., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, Katharine, Cameron, Cheryl, Coombs, Michelle, Diefenbach, Angie, Lopez, Taryn, McNutt, Steve, Neal, Christina, Payne, Allison,...
Tags: Active Volcanoes,
Aleutian Arc,
Ash Cloud,
Ash Fall,
Geologic Hazards, All tags...
Hazards,
Historic Eruption,
Redoubt Volcano,
Sample Location,
Tephra,
Tephrochronology,
Volcanic Ash,
Volcanic Eruption,
Volcaniclastics,
Volcanology,
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
Fisher volcano, containing the largest Holocene caldera in the Aleutian volcanic arc, is an active volcano near the center of Unimak Island, about 120 kilometers southwest of Cold Bay and about 175 kilometers northeast of Dutch Harbor. The volcano is composed of numerous small volcanic centers around and within a large, oval caldera 12 by 18 kilometers in diameter and 500 to 1,000 meters deep that formed during a catastrophic eruption about 9,400 years ago. Since then, more than 30 separate vents inside and outside the caldera have erupted; the most recent eruption occurred in 1826. These eruptions have produced lava flows and widespread tephra (volcanic ash) deposits, and have occasionally been accompanied by large...
Tags: Active Volcanoes,
Aleutian Arc,
Aleutian Islands,
Ash Cloud,
Ash Fall, All tags...
Ballistics,
Caldera,
Debris Flow,
Fisher,
Flood,
Geologic Hazards,
Geothermal,
Hazards,
Lahar,
Lava Flow,
Pumice,
Pyroclastic Flow,
Pyroclastic Surge,
Tephra,
Unimak Quadrangle,
Volcanic Ash,
Volcanic Gas,
Volcaniclastics,
Volcanology,
geoscientificInformation, Fewer tags
Kasatochi is a small, isolated island volcano in the center of the Aleutian Island chain. It consists of a roughly circular cone approximately 3 km in diameter with a lake-filled central crater that is 1.2 km in diameter and extends from the highest point on the island to sea level. The oldest unit recognized is a thick series of mid-Pleistocene glaciovolcanic deposits consisting of autobrecciated lava, lahars, and volumetrically minor lava masses that we believe to have been emplaced underneath a regional ice cap. This unit is unconformably overlain by several massive Holocene lavas, above which lies a thick sequence of latest-Holocene pyroclastic deposits likely deposited during the crater-forming eruption. The...
Tags: Active Volcanoes,
Age Dates,
Aleutian Arc,
Aleutian Islands,
Alluvial Deposits, All tags...
Analyses,
Analyses and Sampling,
Basalt,
Bedrock,
Bedrock Geology,
Caldera,
Chemistry,
Colluvium,
Erosion,
Fan,
Geochemical Data,
Geochemistry,
Geochronology,
Geologic,
Geologic Hazards,
Geologic Map,
Geological Process,
Geology,
Geomorphology,
Hazards,
Historic Eruption,
Igneous,
Kasatochi,
Lava Flow,
Mineralogy,
Petrographic,
Petrography,
Petrology,
Pumice,
Pyroclastics,
Rockfall,
Rocks,
Sample Location,
Slope Instability,
Slump,
Soils,
Surface,
Surficial,
Talus,
Tephra,
Topography,
Ultramafic,
Uplift,
Volcanic,
Volcanic Ash,
Volcanic Eruption,
Volcanic Rocks,
Volcaniclastics,
Volcanoes,
Volcanology,
geoscientificInformation, Fewer tags
This data lists the historically active volcanoes of Alaska and the year of the last major eruptive event. The volcanoes listed meet at least one of the following criteria since 1700 CE: 1) Documented, unquestioned eruption OR 2) A strongly suspected eruption, often an eruption documented in a historical account with very little information. Current geologic knowledge must not contradict the eruption account, OR 3) Persistent (usually on the order of decades, but certainly longer than several months) fumaroles, with temperatures (where measured) within approximately 10 degrees C of the boiling point, OR 4) Significant, measured, volcanic-related, non-eruptive deformation, OR 5) Documented earthquake swarm with strongly...
Tags: Active Volcanoes,
Alaska Peninsula,
Alaska Statewide Maps,
Alaska, State of,
Aleutian Arc, All tags...
Aleutian Islands,
Coastal and River,
Coastal and River Hazards,
Geologic Hazards,
Geology,
Hazards,
Historic Eruption,
Volcanic,
Volcanic Eruption,
Volcano Hazards,
Volcanoes,
Volcanology,
geoscientificInformation, Fewer tags
This 30-meter, horizontal, cell-size, shaded relief, georeferenced TIFF image of Okmok Volcano, Umnak Island, Alaska, was created by combining digital elevation model (DEM) data provided by NASA's shuttle radar topography mission (SRTM) and the aircraft-mounted synthetic aperture radar (AirSAR) mission.
Tags: Aleutian Arc,
Fox Islands,
Geomorphology,
Hillshade Image,
Okmok, All tags...
Okmok Volcano,
Shaded Relief,
Umnak Island,
Volcanoes,
geoscientificInformation, Fewer tags
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