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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
Staff from Alaska Earthquake Center, Geophysical Institute and Alaska Division of Geological & Geophysical Surveys evaluated potential tsunami hazards for the city of Sand Point, on Popof Island in the Shumagin Islands archipelago. We numerically modeled the extent of inundation from tsunami waves generated by local and distant earthquake sources. We considered the results in light of historical observations. The worst-case scenarios are defined by analyzing results of the sensitivity study of the tsunami dynamics with respect to different slip distributions along the Aleutian megathrust. For the Sand Point area, the worst-case scenarios are thought to be thrust earthquakes in the Shumagin Islands region with magnitudes...
Tags: Active Fault,
Alaska Earthquake 1964,
Aleutian Islands,
Bathymetry,
Coastal, All tags...
Coastal and River,
Earthquake,
Emergency Preparedness,
Engineering,
Engineering Geology,
Fault Displacement,
Faulting,
Faults,
Flood,
Geologic Hazards,
Geology,
Hazards,
Humboldt Harbor,
Inundation,
Land Subsidence,
Modeling,
Popof Island,
Raster Image,
Sand Point,
Seismic Gap,
Seismic Hazards,
Seismology,
Shumagin Islands,
Surface,
Topography,
Tsunami,
Water,
geoscientificInformation, Fewer tags
The engineering-geologic map is derived electronically, using Geographic Information System (GIS) software, from the surficial-geologic map of the second segment of the proposed natural gas pipeline corridor through the upper Tanana valley, a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway through the upper Tanana River valley from the Robertson River eastward to near Tetlin Junction in the Tanacross Quadrangle (Reger and Hubbard, PIR 2009-6A). Surficial-geologic units were initially identified by interpretation of false-color ~1:65,000-scale infrared aerial photographs taken in July 1978, August 1980, and August 1981 and locally verified by field checking in 2007 and 2008. The map shows the distribution...
Tags: Alaska Highway Corridor,
Alaska Range,
Alaska, State of,
Alluvial Deposits,
Climate Change, All tags...
Colluvial Deposits,
Construction Materials,
Crushed Gravel,
Crushed Rock,
Dot Lake,
Engineering,
Engineering Geology,
Floodplain,
Floods,
Gasline,
Geologic Hazards,
Geologic Map,
Geologic Materials,
Icings,
Land Subsidence,
Landslide,
Liquefaction,
Materials Site,
Permafrost,
Proposed Natural Gas Pipeline,
Robertson River,
Sand & Gravel,
Subsidence,
Surficial Geology,
Tanacross,
Tanacross Quadrangle,
Taylor Highway,
Tok,
Tok River,
Transportation Corridor,
Unconsolidated Deposits,
geoscientificInformation, Fewer tags
Potential tsunami hazard for the Umnak Island community of Nikolski is evaluated 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 Aleutian megathrust. The worst-case scenarios for Nikolski are thought to be thrust earthquakes in the Umnak Island region with their greatest slip at 10-30 km (6.2-19 mi) depth. We also consider Tohoku-type ruptures and an outer-rise rupture in the area of Umnak Island. The maximum predicted water depth on Main Street is about 15 m (49 ft), while the maximum current...
Tags: Active Fault,
Aleutian Islands,
Coastal,
Coastal and River Hazards,
Earthquake, All tags...
Earthquake Related Hazards,
Emergency Preparedness,
Engineering Geology,
Fault Displacement,
Faulting,
Flood,
Geologic Hazards,
Hazards,
Inundation,
Land Subsidence,
Modeling,
Nikolski,
Raster Image,
Seismic Gap,
Seismic Hazards,
Tsunami,
geoscientificInformation, Fewer tags
This report provides detailed (1:63,360-scale) mapping of the Tanana A-1 and A-2 quadrangles (500 square miles; equivalent to eight 7.5-minute quadrangles). The area is part of the Manley Hot Springs-Tofty mining districts and adjacent to the Rampart mining district to the south of the Tanana B-1 Quadrangle. This report includes detailed geologic construction materials and geologic hazards data. The Tanana A-1 and A-2 Quadrangles and surrounding area comprise several isolated mountainous ridges in the western Yukon-Tanana Upland of interior Alaska.
Tags: Aerial Photography,
Construction Materials,
Decorative Stone,
Economic Geology,
Engineering Geology, All tags...
Floods,
Ice,
Land Subsidence,
Landslide,
Liquefaction,
Manley Basin,
Manley Hot Springs,
Permafrost,
Resource Assessment,
Sand & Gravel,
Surficial Geology,
Yukon River,
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
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
Potential tsunami hazard for the Alaska Peninsula communities of Chignik and Chignik Lagoon is evaluated 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 Chignik area communities are thought to be thrust earthquakes along the Alaska Peninsula with their greatest slip at 5-35 km (3.1-22 mi) depth. We also consider Tohoku-type ruptures and an outer-rise rupture along the Alaska Peninsula. The maximum predicted water depth on Anderson Street...
Tags: Active Fault,
Alaska Peninsula,
Chignik,
Chignik Lagoon,
Coastal, All tags...
Coastal and River Hazards,
Earthquake,
Earthquake Related Hazards,
Emergency Preparedness,
Engineering Geology,
Fault Displacement,
Faulting,
Flood,
Geologic Hazards,
Hazards,
Inundation,
Land Subsidence,
Modeling,
Raster Image,
Seismic Gap,
Seismic Hazards,
Tsunami,
geoscientificInformation, Fewer tags
The engineering-geologic map, on two sheets, is derived electronically from the surficial-geologic map of the initial segment of the proposed natural gas pipeline corridor through the upper Tanana valley (Reger and others, PIR 2008-3a) using Geographic Information System (GIS) software. Surficial-geologic units were initially identified by interpretation of false-color ~1:63,000-scale infrared aerial photographs taken in July 1978, August 1980, and August 1981 and locally verified by field checking in 2006 and 2007. The map shows the distribution of surficial-geologic and bedrock units grouped genetically with common properties that are typically significant for engineering applications.
Tags: Alaska Highway Corridor,
Alluvial Deposits,
Avalanche,
Big Delta,
Big Delta Quadrangle, All tags...
Colluvial Deposits,
Construction Materials,
Crushed Gravel,
Crushed Rock,
Delta Junction,
Delta River,
Dot Lake,
Engineering Geology,
Erosion,
Floodplain,
Floods,
Gasline,
Geologic Hazards,
Geologic Map,
Geologic Materials,
Glacial Deposits,
Icings,
Lake George,
Land Subsidence,
Landslide,
Liquefaction,
Materials Site,
Mount Hayes Quadrangle,
Permafrost,
Proposed Natural Gas Pipeline,
Sand & Gravel,
Subsidence,
Surficial Geology,
Tanana River,
Unconsolidated Deposits, Fewer tags
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