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The purpose of this study is to evaluate tsunami hazard for the community of Seward and northern Resurrection Bay area, Alaska. This report will provide guidance to local emergency managers in tsunami hazard assessment. We used a numerical modeling method to estimate the extent of inundation by tsunami waves generated from earthquake and landslide sources. Our tsunami scenarios included a repeat of the tsunami of the 1964 Great Alaska Earthquake, as well as tsunami waves generated by two hypothetical Yakataga Gap earthquakes in northeastern Gulf of Alaska, hypothetical earthquakes in Prince William Sound and Kodiak asperities of the 1964 rupture, and local underwater landslides in Resurrection Bay. Results of numerical...
Tags: Coastal and River,
Earthquake,
Earthquake Related Slope Failure,
Emergency Preparedness,
Engineering, All tags...
Engineering Geology,
Fault Displacement,
Faulting,
Faults,
Flood,
Geologic Hazards,
Geology,
Inundation,
Kenai Peninsula,
Kenai Peninsula Borough Coastal District,
Landslide,
Modeling,
Resurrection Bay,
Seismic Hazards,
Seward,
Slides,
Slope,
Slope Instability,
Southcentral Alaska,
Surface,
Tides,
Tsunami,
geoscientificInformation, Fewer tags
Potential tsunami hazards for the Fox Islands communities of Unalaska/Dutch Harbor and Akutan were evaluated by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquake sources and taking into account historical observations. Worst-case hypothetical scenarios are defined by analyzing results of a sensitivity study of the tsunami dynamics related to various slip distributions along the Aleutian megathrust. The worst-case scenarios for Unalaska and Akutan are thought to be thrust earthquakes in the Fox Islands region with magnitudes ranging from Mw 8.8 to Mw 9.1 that have their greatest slip at 30-40 km (18-25 mi) depth. We also consider Tohoku-type ruptures and an outer-rise...
Tags: Active Fault,
Akutan,
Coastal,
Earthquake,
Earthquake Related Slope Failure, All tags...
Emergency Preparedness,
Engineering,
Engineering Geology,
Fault Displacement,
Faulting,
Flood,
Fox Islands,
Geologic Hazards,
Geology,
Hazards,
Inundation,
Land Subsidence,
Landslide,
Modeling,
Raster Image,
Seismic Gap,
Seismic Hazards,
Slides,
Slope,
Slope Instability,
Tides,
Topography,
Tsunami,
Unalaska,
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: Aeolian,
Alaska Highway Corridor,
Alaska Pipeline,
Alaska, State of,
Beaver Creek, All tags...
Canada,
Chisana River,
Engineering,
Engineering Geology,
Eolian,
Gasline,
Geologic Hazards,
Geologic Map,
Geology,
Hazards,
Landslide,
Landslide Deposit,
Loess,
Midway Lake,
Nabesna,
Nabesna Quadrangle,
Nabesna River,
Natural Gas,
Northway,
Northway Junction,
Periglacial Slope Failure,
Permafrost,
Pipeline,
Proposed Natural Gas Pipeline,
Retransported Loess,
Scottie Creek,
Tanacross Quadrangle,
Tanana Basin,
Tanana River,
Taylor Highway,
Tetlin,
Tetlin Junction,
Tetlin National Wildlife Refuge,
Thawing Permafrost,
Translational Landslide,
Transportation Corridor,
Unconsolidated Deposits,
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
In this report, we evaluate potential tsunami hazards for southeastern Alaska communities of Elfin Cove, Gustavus, and Hoonah and numerically model the extent of inundation from tsunami waves generated by tectonic and landslide sources. We perform numerical modeling of historic tsunami events, such as the tsunami triggered by the 1964 Great Alaska Earthquake, and the tsunami waves generated by the recent 2011 Tohoku and 2012 Haida Gwaii earthquakes. Hypothetical tsunami scenarios include variations of the extended 1964 rupture, megathrust earthquakes in the Prince William Sound and Alaska Peninsula regions, and a Cascadia megathrust earthquake. Local underwater landslide events in Taylor Bay and Port Frederick,...
Tags: Active Fault,
Bartlett Cove,
Coastal,
Coastal and River,
Earthquake, All tags...
Earthquake Related Slope Failure,
Emergency Preparedness,
Engineering,
Engineering Geology,
Fault Displacement,
Faulting,
Flood,
Geologic Hazards,
Geology,
Hazards,
Humpback Creek,
Icy Strait,
Inundation,
Landslide,
Modeling,
Port Frederick,
Raster Image,
Rock Avalanche,
Rockfall,
Seismic Hazards,
Slides,
Slope,
Slope Instability,
Southeast Alaska,
Taylor Bay,
Tidal Inlet,
Tides,
Topography,
Tsunami,
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
We evaluate potential tsunami hazards for the city of Valdez and numerically model the extent of inundation from tsunamis generated by earthquake and landslide sources. Tsunami scenarios include a repeat of the tsunami triggered by the 1964 Great Alaska Earthquake, as well as hypothetical tsunamis generated by an extended 1964 rupture, a Cascadia megathrust earthquake, and earthquakes from the Prince William Sound and Kodiak asperities of the 1964 rupture. Local underwater landslide events in Port Valdez are also considered as credible tsunamigenic scenarios. Results of numerical modeling are verified by simulating the tectonic and landslide-generated tsunamis in Port Valdez observed during the 1964 earthquake....
Tags: Active Fault,
Alaska Earthquake 1964,
Bathymetry,
Coastal,
Coastal and River, All tags...
Earthquake,
Earthquake Related Slope Failure,
Emergency Preparedness,
Engineering,
Engineering Geology,
Faulting,
Faults,
Flood,
Geologic Hazards,
Geology,
Hazards,
Inundation,
Landslide,
Modeling,
Seismic Hazards,
Tides,
Tsunami,
Valdez Quadrangle,
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
In this report, we evaluate potential tsunami hazards for the southeastern Alaska community of Juneau and numerically model the extent of inundation from tsunami waves generated by tectonic and submarine landslide sources. We calibrate our tsunami model by numerically simulating the 2011 Tohoku tsunami at Juneau and comparing our results to instrument records. Analysis of calculated and observed water level dynamics for the 2011 event in Juneau reveals that the model underestimates the observed wave heights in the city by a factor of two, likely due to complex tsunami-tide interactions. We compensate for this numerical underestimation by doubling the coseismic slip of the hypothetical tsunami sources in our models....
Tags: Bathymetry,
Berners Bay,
Coastal,
Douglas,
Douglas Island, All tags...
Eagle River,
Earthquake,
Engineering,
Environmental,
Faults,
Favorite Channel,
Flood,
Fritz Cove,
Geologic,
Geology,
Geotechnical,
Hazards,
Inundation,
Juneau,
Landslide,
Marine,
Mendenhall River,
Modeling,
Regional,
Rockfall,
Saginaw Channel,
Sediment,
Sedimentation,
Sheep Creek,
Slides,
Slope,
Slump,
Southeast Alaska,
Subduction,
Subsidence,
Surface,
Taku Inlet,
Tectonics,
Topography,
Tsunami,
Uplift,
Water,
geoscientificInformation, Fewer tags
The purpose of this study is to evaluate potential tsunami hazards for the community of Whittier and western Passage Canal area. We numerically model the extent of inundation due to tsunami waves generated from earthquake and landslide sources. Tsunami scenarios include a repeat of the tsunami triggered by the 1964 Great Alaska Earthquake, as well as tsunami waves generated by a hypothetically extended 1964 rupture, a hypothetical Cascadia megathrust earthquake, hypothetical earthquakes in Prince William Sound, and Kodiak asperities of the 1964 rupture. Local underwater landslide and rockslide events in Passage Canal are also considered as credible tsunamigenic scenarios. Results of numerical modeling combined with...
Tags: Active Fault,
Alaska Earthquake 1964,
Bathymetry,
Coastal,
Coastal and River, All tags...
Earthquake,
Earthquake Related Slope Failure,
Emergency Preparedness,
Engineering,
Engineering Geology,
Fault Displacement,
Faulting,
Faults,
Flood,
Geologic Hazards,
Geology,
Landslide,
Modeling,
Passage Canal,
Rock Avalanche,
Rockfall,
Seismic Hazards,
Slides,
Slope,
Slope Instability,
Tides,
Tsunami,
Volcanoes,
Whittier,
geoscientificInformation, Fewer tags
Potential tsunami hazards for the Alaska Peninsula communities of King Cove and Cold Bay were evaluated by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquake sources and taking into account historical observations. Worst-case hypothetical scenarios are defined by analyzing the tsunami dynamics related to various slip distributions along the Aleutian megathrust. Our results show that the worst-case scenarios for King Cove and Cold Bay are thrust earthquakes in the western Alaska Peninsula region, with magnitudes ranging from Mw 8.9 to Mw 9.3, which have their greatest slip at 10-20 km (6-12 mi) depth. We also consider Tohoku-type ruptures and an outer-rise rupture...
Tags: Active Fault,
Alaska Peninsula,
Aleutian Islands,
Coastal,
Coastal and River Hazards, All tags...
Cold Bay,
Earthquake,
Earthquake Related Hazards,
Emergency Preparedness,
Engineering Geology,
Fault Displacement,
Faulting,
Flood,
Geologic Hazards,
Hazards,
Inundation,
King Cove,
Land Subsidence,
Landslide,
Modeling,
Raster Image,
Seismic Gap,
Seismic Hazards,
Tsunami,
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
Staff from Alaska Earthquake Center, Geophysical Institute and Alaska Division of Geological & Geophysical Surveys evaluated potential potential tsunami hazard for the communities of Kodiak, Womens Bay, and for the U.S. Coast Guard base on Kodiak Island by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquake sources. Worst-case hypothetical scenarios are defined by analyzing results of a sensitivity study of the tsunami dynamics related to various slip distributions along the Alaska-Aleutian megathrust. The worst-case scenarios for the Kodiak communities are thought to be the subduction zone earthquakes offshore Kodiak Island with their greatest slip at 5-35 km (3.1-22...
Tags: Active Fault,
Bathymetry,
Coastal,
Coastal and River,
Earthquake, All tags...
Emergency Preparedness,
Engineering,
Engineering Geology,
Environmental,
Fault Displacement,
Faulting,
Faults,
Flood,
Geologic,
Geologic Hazards,
Geology,
Hazards,
Inundation,
Kodiak,
Kodiak Island,
Kodiak Island Borough,
Kodiak Quadrangle,
Kodiak Station,
Land Subsidence,
Landslide,
Marine Geology,
Modeling,
Neotectonics,
Pillar Mountain,
Seismic Hazards,
Slope,
Subduction,
Subsidence,
Surface,
Tectonics,
Tides,
Topography,
Tsunami,
Water,
geoscientificInformation, Fewer tags
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