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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 surficial-geologic map shows the distribution of unconsolidated deposits and undifferentiated bedrock in the Faith Creek area in the Circle A-4, A-5, B-4, and B-5 quadrangles. This map was prepared principally by the interpretation of 1:63,360-scale, false-color, infrared aerial photographs taken in 1979 and 1981 and is locally verified by ground observations during field work in 2007.
Tags: Aerial Geology,
Alluvial Deposits,
Alluvial Fan,
Alluvium,
Chatanika River, All tags...
Circle Quadrangle,
Colluvial Deposits,
Colluvium,
Complex Deposits,
Fairbanks Mining District,
Faith Creek,
Fluvial,
Geologic Map,
Geomorphology,
Glacial Deposits,
Glacial Drift,
Glacial Geology,
Landslide,
Landslide Deposit,
Man-Made Deposits,
Mining,
Pingos,
Placer,
Sourdough Camp,
Steese Highway,
Surficial,
Surficial Geologic Map,
Surficial Geology,
Terrace,
Till,
geoscientificInformation, Fewer tags
Aerial photographs of the coastline from Teller to Nome were collected between August 26, 2015 - August 27, 2015. The photographs were processed using Structure-from-Motion (SfM) photogrammetric techniques. Global Positioning System (GPS) checkpoints were collected via a Global Navigation Satellite System (GNSS) survey conducted between August 15 and September 14, 2015. For the purposes of open access to elevation and orthoimagery datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license. Orthoimages contain 4-band, 8-bit, unsigned raster data (red/green/blue/no data; file format-GeoTIFF; source-Fairbanks Fodar) with 20 cm GSD. No-data values are found...
Tags: Brevig Mission,
Coastal,
Coastal and River,
Engineering,
Engineering Geology, All tags...
Environmental,
Geologic Hazards,
Geology,
Geomorphology,
Hazards,
Hillshade Image,
Marine Geology,
Methods,
Nome,
Orthoimagery,
Raster Image,
Sinuk,
Surficial,
Teller,
geoscientificInformation, Fewer tags
The State of Alaska Division of Geological & Geophysical Surveys (DGGS) produced an orthorectified aerial optical image mosaic (orthoimage) and digital surface model over an area extending from milepost (MP) 17 to approximately MP 24.5 on the Alaska State Highway 7 (Haines Highway) north of Haines along the Chilkat River in southeast Alaska. The aerial photogrammetric survey targeted large debris fans and their alpine source areas on the west side of the Takshanuk Mountains in support of cryosphere hazards mapping and monitoring efforts. Aerial photographs and Global Navigation Satellite System (GNSS) data were collected on May 26, 2014, and were processed using Structure-from-Motion (SfM) photogrammetric techniques...
Tags: Aerial,
Alaska, State of,
Chilkat River,
Debris Flow,
Engineering, All tags...
Engineering Geology,
Environmental,
Geologic Hazards,
Geology,
Geomorphology,
Haines,
Hazards,
Klukwan,
Methods,
Orthoimagery,
Raster Image,
Slope,
Southeast Alaska,
Surface,
Surficial,
Takshanuk Mountains,
geoscientificInformation, Fewer tags
Aerial photographs of the coastline from Nome to Elim were collected on August 23, 2015. The photographs were processed using Structure-from-Motion (SfM) photogrammetric techniques. Global Positioning System (GPS) checkpoints were collected via a Global Navigation Satellite System (GNSS) survey conducted between August 15 and September 14, 2015. For the purposes of open access to elevation and orthoimagery datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license. This file is a single-band, 32-bit float DSM (digital surface model) which represents surface elevations of buildings, vegetation, and uncovered ground surfaces in meters with 20 cm GSD. The...
Tags: Bear Creek,
Bonanza River,
Cape Darby,
Cape Nome,
Coastal, All tags...
Coastal Erosion,
Coastal and River,
Daniels Creek,
Dry Creek,
Elim,
Engineering,
Engineering Geology,
Environmental,
Fish River,
Flambeau River,
Geologic,
Geologic Hazards,
Geological Process,
Geomorphology,
Golovin,
Hazards,
Hillshade Image,
Iron Creek,
Kachauik River,
Kwiniuk River,
Methods,
Moses Point Fishing Village,
Mudyutok River,
Nome,
Nome River,
Orthoimagery,
Port Safety,
Portage Creek,
Raster Image,
Rock Creek,
Snake River,
Solomon,
Solomon River,
Surface,
Surficial,
Surficial Geology,
White Mountain,
Yuonglik River,
geoscientificInformation, Fewer tags
This report provides detailed (1:63,360-scale) mapping of portions of U.S. Geological Survey Circle B-2 (1955), B-3 (1955), B-4 (1952), C-2 (1955), C-3 (1955), and C-4 (1952) quadrangles. The area is part of the Circle mining district and adjacent to the Fairbanks mining district. This report includes detailed geologic, structural, stratigraphic, and geochronologic data. Based on the resulting geologic maps, field investigations, and laboratory materials analyses, the project has also generated derivative maps of geologic construction materials and geologic hazards.
Tags: Aereal,
Aerial Photography,
Aeromagnetic Survey,
Age Dates,
Alaska, State of, All tags...
Alluvial Deposits,
Alluvium,
Amphibolite,
Ar-Ar,
Bedrock,
Bibliography,
Birch Creek,
C14,
Carbonates,
Circle Hot Springs,
Circle Mining District,
Circle Quadrangle,
Clastics,
Coal,
Colluvial Deposits,
Colluvium,
Conductivity Survey,
Conodonts,
Crooked Creek,
Electromagnetic Survey,
Fan,
Faulting,
Faults,
Fluvial,
Folding,
Fossils,
Geologic,
Geomorphology,
Glacial,
Glacial Deposits,
Glacial Drift,
Granite,
Hornblende,
Hornfels,
Igneous Rocks,
K-Ar,
Magnetite,
Major Oxides,
Mammoth Creek,
Mastodon Dome,
Metamorphic Grade,
Metamorphic Minerals,
Metamorphism,
Mineralogy,
Modal Analysis,
Petrography,
Plutonic,
Plutonic Hosted,
Porphyry,
Precious Metals,
Quartz,
Regional,
Regional Metamorphism,
Sample Location,
Sandstone,
Schist,
Sedimentary,
Structure,
Surficial,
Tectonics,
Terranes,
geoscientificInformation, Fewer tags
The Alaska Division of Geological & Geophysical Surveys (DGGS), in partnership with the U.S. National Cooperative Geologic Mapping Program, mapped approximately 450 mi2 of the Talkeetna Mountains region of central Alaska at 1:50,000 scale over the course of six weeks in 2014. This area contains significant exposures of Late Triassic mafic volcanics and gabbro sills that have been the focus of region-wide exploration for the Strategic and Critical platinum-group elements (PGEs). The area also exposes numerous inactive and possibly active faults which project through the area of proposed hydropower development. The resulting geologic map offers an improved understanding of the geology, structural history, and mineral...
Tags: 40Ar/39Ar,
Aerial Geology,
Aerial Photography,
Alluvial,
Alluvial Deposits, All tags...
Amphibolite Facies Units,
Bedrock Geologic Map,
Bedrock Geology,
Brachiopods,
Cleary Creek,
Colluvial Deposits,
Cordilleran Ice Sheet,
Crinoids,
Esker,
Faulting,
Faults,
Floodplain,
Fluvial,
Fossils,
Geochronology,
Geologic Map,
Geologic Materials,
Geomorphology,
Glacial,
Glacial Deposits,
Glacial Drift,
Glacial Geology,
Glacial Geomorphology,
Glacial History,
Glacial Lake,
Glacial Processes,
Glacial Stratigraphy,
Glaciation,
Ice Contact Deposits,
Ice-Contact,
Iron Creek,
Lacustrine,
Lacustrine Sedimentation,
Landslide,
Landslide Deposit,
Outwash,
Outwash Fan,
Paleochannel,
Permafrost and Periglacial,
Remote Sensing,
Rock Glaciers,
Rock-Glacier Deposits,
Rockfall,
STATEMAP Project,
Sand and Gravel,
Slides,
Slope Instability,
Soil Creep,
Stephan Lake,
Surficial,
Surficial Geologic Map,
Surficial Geology,
Talkeetna Mountains,
Talkeetna Mountains Quadrangle,
Talkeetna River,
Till,
geoscientificInformation, Fewer tags
This 1:50,000 scale geologic map describes the distribution of unconsolidated deposits, identifies local geologic hazards, and provides information about the depositional environment and basic engineering properties of common surficial-geologic materials in and around Shaktoolik, Alaska. Map units are the result of combined field observations and aerial imagery interpretation. A suite of local ground observations were collected over a two-week period in July 2011 by a helicopter-supported team of DGGS geologists and collaborators. Field investigations included soil test pits, sample collection, soil and rock description, oblique aerial photography, and documentation of landscape morphology.
Tags: Alluvial,
Alluvium,
Analyses and Sampling,
C14,
Clay, All tags...
Coastal,
Coastal and River,
Colluvium,
Conglomerate,
Construction Materials,
Engineering,
Engineering Geology,
Eolian,
Erosion,
Fan,
Flood,
Floodplain,
Fluvial,
Gelifluction,
Geochronology,
Geologic,
Geologic Hazards,
Geologic Map,
Geology,
Geomorphology,
Geotechnical,
Gravel,
Hazards,
Ice,
Image Interpretation,
Interpretation,
Inundation,
Lacustrine,
Lakes,
Meltwater,
Norton Bay Quadrangle,
Permafrost,
Permafrost and Periglacial,
Resource Assessment,
Resources,
Rocks,
Sand,
Sand and Gravel,
Sediment,
Sedimentation,
Shaktoolik,
Silt,
Slope,
Slump,
Surface,
Surficial,
Surficial Geologic Map,
Surficial Geology,
Terrace,
Thaw Lakes,
Thawing Permafrost,
Thermokarst,
geoscientificInformation, Fewer tags
The State of Alaska Division of Geological & Geophysical Surveys (DGGS) produced a digital surface model (DSM) and an orthorectified aerial optical image mosaic (orthoimagery) of the Resurrection Bay watershed, surrounding the city of Seward in south-central Alaska. Aerial photographs and Global Navigation Satellite System (GNSS) data were collected on August 13, 2015, and were processed using Structure-from-Motion (SfM) photogrammetric techniques to create the DSM and orthoimagery. All data are projected in UTM Zone 6 North (meters) using the NAD83 (2011; EPSG 26906) horizontal datum and NAVD88 (Geoid12A; EPOCH 2010.00) vertical datum. The project was part of an ongoing investigation of the impact of flooding,...
Tags: Aerial,
Bear Creek,
Bear Lake,
Bear Lake Glacier,
Bear Mountain, All tags...
Box Canyon Creek,
Caines Head,
Callisto Peak,
Clear Creek,
Derby Cove,
Engineering,
Engineering Geology,
Environmental,
First Lake,
Fourth of July Creek,
Geologic,
Geologic Hazards,
Geological Process,
Geology,
Geomorphology,
Godwin Creek,
Grouse Lake,
Hazards,
Japanese Creek,
Lakes,
Likes Creek,
Little Bear Lake,
Lost Creek,
Lost Lake Trail,
Lowell Creek,
Lowell Point,
Marathon Mountain,
Methods,
Mount Alice,
Mount Benson,
Mount Eva,
Orthoimagery,
Phoenix Peak,
Preachers Pond,
Prospect Glacier,
Race Point,
Raster Image,
Resurrection Bay,
Resurrection River,
Salmon Creek,
Sawmill Creek,
Scheffler Creek,
Second Lake,
Seward,
Slope,
Spring Creek,
Spruce Creek,
Surface,
Surficial,
Surficial Geology,
The Lagoon,
Thumb Cove,
Tiehacker Mountain,
Tonsina Creek,
Tonsina Point,
Vegetation,
Water,
Woodrow,
geoscientificInformation, Fewer tags
This map shows the distribution of surficial deposits and undifferentiated bedrock in parts of the Livengood C-3 and C-4 quadrangles, Tolovana mining district.
Tags: Aeolian,
Aerial Geology,
Age Dates,
Alluvial Deposits,
Alluvium, All tags...
C14,
Colluvial Deposits,
Colluvium,
Debris Flow,
Debris Flow Deposit,
Elliot Highway,
Eolian,
Floodplain,
Geomorphology,
Goldstream Creek,
Landslide,
Livengood,
Livengood Bench,
Livengood Creek,
Livengood Dome,
Livengood Mining District,
Livengood Quadrangle,
Money Knob,
Permafrost,
Permafrost and Periglacial,
Pingos,
Placer,
Placer Gold,
STATEMAP Project,
Slides,
Slope Instability,
Solifluction,
Surficial,
Surficial Geologic Map,
Surficial Geology,
Tailings,
Thawing Permafrost,
Thermokarst,
Trans-Alaska Pipeline,
geoscientificInformation, Fewer tags
Aerial photographs of the coastline from Wales to Teller were collected on August 27, 2015 - August 28, 2015. The photographs were processed using Structure-from-Motion (SfM) photogrammetric techniques. Global Positioning System (GPS) checkpoints were collected via a Global Navigation Satellite System (GNSS) survey conducted between August 15 and September 14, 2015. For the purposes of open access to elevation and orthoimagery datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license. Orthoimages contain 4-band, 8-bit, unsigned raster data (red/green/blue/no data; file format-GeoTIFF; source-Fairbanks Fodar) with 20 cm GSD. No-data values are found...
Tags: Coastal,
Coastal Erosion,
Coastal and River,
Engineering,
Engineering Geology, All tags...
Environmental,
Geologic,
Geologic Hazards,
Geological Process,
Geology,
Geomorphology,
Hazards,
Hillshade Image,
Methods,
Orthoimagery,
Raster Image,
Seward Peninsula,
Surface,
Surficial,
Surficial Geology,
Teller,
Wales,
geoscientificInformation, Fewer tags
The State of Alaska Division of Geological & Geophysical Surveys (DGGS) produced a digital surface model (DSM) and an orthorectified aerial optical image mosaic (orthoimagery) of the Resurrection Bay watershed, surrounding the city of Seward in south-central Alaska. Aerial photographs and Global Navigation Satellite System (GNSS) data were collected on August 13, 2015, and were processed using Structure-from-Motion (SfM) photogrammetric techniques to create the DSM and orthoimagery. All data are projected in UTM Zone 6 North (meters) using the NAD83 (2011; EPSG 26906) horizontal datum and NAVD88 (Geoid12A; EPOCH 2010.00) vertical datum. The project was part of an ongoing investigation of the impact of flooding,...
Tags: Aerial,
Bear Creek,
Bear Lake,
Bear Lake Glacier,
Bear Mountain, All tags...
Box Canyon Creek,
Caines Head,
Callisto Peak,
Clear Creek,
Derby Cove,
Engineering,
Engineering Geology,
Environmental,
First Lake,
Fourth of July Creek,
Geologic,
Geologic Hazards,
Geological Process,
Geology,
Geomorphology,
Godwin Creek,
Grouse Lake,
Hazards,
Japanese Creek,
Lakes,
Likes Creek,
Little Bear Lake,
Lost Creek,
Lost Lake Trail,
Lowell Creek,
Lowell Point,
Marathon Mountain,
Methods,
Mount Alice,
Mount Benson,
Mount Eva,
Orthoimagery,
Phoenix Peak,
Preachers Pond,
Prospect Glacier,
Race Point,
Raster Image,
Resurrection Bay,
Resurrection River,
Salmon Creek,
Sawmill Creek,
Scheffler Creek,
Second Lake,
Seward,
Slope,
Spring Creek,
Spruce Creek,
Surface,
Surficial,
Surficial Geology,
The Lagoon,
Thumb Cove,
Tiehacker Mountain,
Tonsina Creek,
Tonsina Point,
Vegetation,
Water,
Woodrow,
geoscientificInformation, Fewer tags
In support of the proposed Susitna-Watana Hydroelectric Project, the Alaska Division of Geological & Geophysical Surveys (DGGS) developed a Geographic Information System (GIS)-based geologic compilation of published and unpublished maps for twelve, inch-to-mile (1:63,360-scale) quadrangles encompassing the proposed hydroelectric project footprint, including the anticipated reservoir and surrounding area. DGGS geologists reviewed and analyzed existing geologic mapping for quality and completeness, and the maps were converted for use in GIS. The conversion process included scanning and georeferencing the original hard-copy map documents, creating a geodatabase, digitizing the geologic data, assigning attributes, and...
Tags: Bedrock Geologic Map,
Bedrock Geology,
Generalized,
Geodatabase,
Geologic Map, All tags...
Geology,
Gis,
Healy Quadrangle,
Hydropower,
Project Report,
Regional,
Surficial,
Surficial Geologic Map,
Surficial Geology,
Susitna,
Susitna Dam,
Susitna North,
Susitna River,
Susitna-Watana Hydroelectric Project,
Talkeetna Mountains,
Talkeetna Mountains Quadrangle,
Unconsolidated Deposits,
geoscientificInformation, Fewer tags
This report presents the findings of a geologic and geotechnical evaluation of a landslide at the Yukon River bridge (the E.L. Patton Bridge). The Yukon River bridge landslide occurred in fall 2012 between approximately 375 and 575 feet west of the bridge. Although there was no damage to the bridge foundation, the landslide's close proximity to the bridge and concerns over additional failures prompted multiple evaluations, including landslide documentation, drainage assessments, and geotechnical studies. This report was prepared to convey the general characteristics of the rock mass, characteristics of rock discontinuities, and the geomorphic expression of the 2012 landslide in the vicinity of the bridge. We determined...
Tags: Alluvial Fan,
Alluvium,
Coastal and River Hazards,
Colluvial Deposits,
Colluvium, All tags...
Dalton Highway,
Drainage Patterns,
Earthquake Related Hazards,
Engineering,
Erosion,
Fracturing,
Geological Process,
Geology,
Geomorphology,
Geotechnical,
Hazards,
Landslide,
Livengood Quadrangle,
Loess,
Permafrost and Periglacial,
Slope Instability Hazards,
Surficial,
Trans-Alaska Pipeline,
Translational Landslide,
Transportation Corridor,
Yukon River,
geoscientificInformation, Fewer tags
Aerial photographs of the coastline from Wales to Teller were collected on August 27, 2015 - August 28, 2015. The photographs were processed using Structure-from-Motion (SfM) photogrammetric techniques. Global Positioning System (GPS) checkpoints were collected via a Global Navigation Satellite System (GNSS) survey conducted between August 15 and September 14, 2015. For the purposes of open access to elevation and orthoimagery datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license. This file is a single-band, 32-bit float DSM (digital surface model) which represents surface elevations of buildings, vegetation, and uncovered ground surfaces in meters...
Tags: Coastal,
Coastal Erosion,
Coastal and River,
Engineering,
Engineering Geology, All tags...
Environmental,
Geologic,
Geologic Hazards,
Geological Process,
Geology,
Geomorphology,
Hazards,
Hillshade Image,
Methods,
Orthoimagery,
Raster Image,
Seward Peninsula,
Surface,
Surficial,
Surficial Geology,
Teller,
Wales,
geoscientificInformation, Fewer tags
Aerial photographs of the coastline from Nome to Elim were collected on August 23, 2015. The photographs were processed using Structure-from-Motion (SfM) photogrammetric techniques. Global Positioning System (GPS) checkpoints were collected via a Global Navigation Satellite System (GNSS) survey conducted between August 15 and September 14, 2015. For the purposes of open access to elevation and orthoimagery datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license. Orthoimages contain 4-band, 8-bit, unsigned raster data (red/green/blue/no data; file format-GeoTIFF; source-Fairbanks Fodar) with 20 cm GSD. No-data values are found in band 4 or shown as...
Tags: Bear Creek,
Bonanza River,
Cape Darby,
Cape Nome,
Coastal, All tags...
Coastal Erosion,
Coastal and River,
Daniels Creek,
Dry Creek,
Elim,
Engineering,
Engineering Geology,
Environmental,
Fish River,
Flambeau River,
Geologic,
Geologic Hazards,
Geological Process,
Geomorphology,
Golovin,
Hazards,
Hillshade Image,
Iron Creek,
Kachauik River,
Kwiniuk River,
Methods,
Moses Point Fishing Village,
Mudyutok River,
Nome,
Nome River,
Orthoimagery,
Port Safety,
Portage Creek,
Raster Image,
Rock Creek,
Snake River,
Solomon,
Solomon River,
Surface,
Surficial,
Surficial Geology,
White Mountain,
Yuonglik River,
geoscientificInformation, Fewer tags
Mount Chiginagak is a hydrothermally active volcano on the Alaska Peninsula, approximately 170 km south-southwest of King Salmon, Alaska. This small stratovolcano, approximately 8 km in diameter, has erupted through Tertiary to Permian sedimentary and igneous rocks. The eruptive products of Chiginagak volcano record a history of chiefly andesite lava flows and associated block-and-ash flows. The oldest lavas exposed are Pleistocene in age and are found everywhere around the edifice except in the northeast sector, where Holocene lava flows dominate the landscape. Holocene activity has covered the northeast flank with rubbly-topped andesite lava flows that extend as far as 4.6 km from their source vent at the summit...
Tags: Alaska Peninsula,
Aleutian Range,
Analyses,
Chiginagak,
Gas, All tags...
Geochemistry,
Geochronology,
Geologic,
Geology,
Hazards,
Igneous,
Lahar,
Mount Chiginagak,
Neoglacial,
Pumice,
Rocks,
Sediment,
Sulfur,
Surface,
Surficial,
Tephra,
Ugashik Quadrangle,
Volcanic,
Volcanic Ash,
Volcanic Eruption,
Volcanic Gas,
Volcanic Rocks,
Volcaniclastic Deposits,
Volcaniclastics,
Volcanoes,
Volcanology,
Water,
geoscientificInformation, Fewer tags
Mount Chiginagak is a hydrothermally active volcano on the Alaska Peninsula, approximately 170 km south-southwest of King Salmon, Alaska. This small stratovolcano, approximately 8 km in diameter, has erupted through Tertiary to Permian sedimentary and igneous rocks. The eruptive products of Chiginagak volcano record a history of chiefly andesite lava flows and associated block-and-ash flows. The oldest lavas exposed are Pleistocene in age and are found everywhere around the edifice except in the northeast sector, where Holocene lava flows dominate the landscape. Holocene activity has covered the northeast flank with rubbly-topped andesite lava flows that extend as far as 4.6 km from their source vent at the summit...
Tags: Alaska Peninsula,
Aleutian Range,
Analyses,
Chiginagak,
Gas, All tags...
GeMS NCGMP09,
Geochemistry,
Geochronology,
Geologic,
Geology,
Hazards,
Igneous,
Lahar,
Mount Chiginagak,
Neoglacial,
Pumice,
Rocks,
Sediment,
Sulfur,
Surface,
Surficial,
Tephra,
Ugashik Quadrangle,
Volcanic,
Volcanic Ash,
Volcanic Eruption,
Volcanic Gas,
Volcanic Rocks,
Volcaniclastic Deposits,
Volcaniclastics,
Volcanoes,
Volcanology,
Water,
geoscientificInformation, Fewer tags
During 2009, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley. The study area is a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway from the western boundaries of the Tanacross B-3 and A-3 quadrangles near Tetlin Junction eastward to the eastern boundaries of the Nabesna D-1 and C-1 quadrangles along the Canada border. Mapping during 2008-2009 in the Tanacross and Nabesna quadrangles linked with the mapping completed in the Tanacross, Big Delta and Mt. Hayes quadrangles in 2006-2008. Surficial geology was initially mapped in...
Tags: Alaska Highway Corridor,
Alaska Range,
Alaska, State of,
Beaver Creek,
Canada, All tags...
Chisana River,
Dunes,
Eolian,
Geologic Hazards,
Geologic Map,
Geologic Materials,
Geological Process,
Geology,
Geomorphology,
Midway Lake,
Nabesna,
Nabesna Quadrangle,
Nabesna River,
Northway,
Northway Junction,
Proposed Natural Gas Pipeline,
Remote Sensing,
Scottie Creek,
Surficial,
Surficial Geology,
Tanacross,
Tanacross Quadrangle,
Tanana River,
Tetlin Junction,
Tetlin National Wildlife Refuge,
Transportation Corridor,
Unconsolidated Deposits,
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
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