Tsunami inundation maps for the city of Sand Point, Alaska

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

Alaska Earthquake March 27, 1964. Landslide effects in Turnagain Heights in Anchorage. 1964.

Alaska Earthquake March 27, 1964. Landslide effects in Turnagain Heights in Anchorage. 1964.

Categories: Image; Tags: Alaska Earthquake 1964, Alaska Earthquake March 27, 1964, Earthquakes, Landslides, photo print

Seward waterfront damage, Seward District, Alaska Gulf Region, Alaska, March 1964.

Alaska Earthquake March 27, 1964. Aerial view of the southern part of the Seward waterfront showing extent of ground fracture and earthquake damage. Seward District, Alaska Gulf Region, Alaska, March 1964. Photo by U.S. Army, March, 1964; mosaicked by U.S. Geological Survey. Published in U.S. Geological Survey Professional paper 542-E, Figure 3, p.E8 & E9. 1967

Categories: Image; Tags: Alaska Earthquake 1964, Earthquakes, photo print

Tsunami inundation maps of Port Valdez, Alaska

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

L Street Landslide, Anchorage, Anchorage District, Cook Inlet Region, Alaska, 1964.

Alaska Earthquake March 27, 1964. Apartment house sheared at the graben of the L Street landslide in Anchorage. Anchorage, Anchorage District, Cook Inlet Region, Alaska, 1964.

Categories: Image; Tags: Alaska Earthquake 1964, Alaska Earthquake March 27, 1964, Earthquakes, Landslides, photo print

Tsunami inundation maps of the villages of Chenega Bay and northern Sawmill Bay, Alaska

Potential tsunami hazards for the community of Chenega Bay, located on Evans Island between Sawmill and Crab bays, were evaluated by numerically modeling the extent of inundation from tsunami waves generated by earthquakes. Tsunami scenarios include a repeat of the tsunami triggered by the 1964 Great Alaska Earthquake, as well as tsunamis generated by a hypothetically extended 1964 rupture, a hypothetical Cascadia megathrust earthquake, a hypothetical earthquake in the Kodiak asperity of the 1964 rupture, and a hypothetical Tohoku-type rupture in the Gulf of Alaska region. Results of numerical modeling are verified by simulations of the tectonic tsunami observed in Chenega Cove during the 1964 earthquake. The results...

Tags: Alaska Earthquake 1964, Coastal, Coastal and River, Coastal and River Hazards, Earthquake, All tags... Earthquake Related Hazards, Emergency Preparedness, Engineering, Engineering Geology, Fault Displacement, Flood, Geologic Hazards, Hazards, Inundation, Modeling, Seismic Hazards, Southcentral Alaska, Tsunami, geoscientificInformation, Fewer tags

Tsunami hazard maps of the Homer and Seldovia areas, Alaska

The purpose of this study was to evaluate a potential tsunami risk for communities of Homer and Seldovia in the Kachemak Bay area, Alaska. This report provides guidance to the local emergency managers in tsunami hazard assessment. We used a numerical modeling method to estimate the extent of inundation due to tsunami waves generated by earthquake sources. Our tsunami scenarios included a repeat of the tsunami of the 1964 great Alaska earthquake, as well as a hypothetical tsunami wave generated by a local fault source. We didn't consider landslide-generated tsunamis in this study. Results of numerical modeling combined with historical observations in the region are intended to help local emergency services officials...

Tags: Active Fault, Alaska Earthquake 1964, Alaska, State of, Bathymetry, Coastal, All tags... Coastal and River, Cook Inlet, Earthquake, Emergency Preparedness, Engineering, Engineering Geology, Fault Displacement, Faulting, Faults, Flood, Geologic Hazards, Geology, Homer, Inundation, Kenai Peninsula Borough Coastal District, Modeling, Seismic Hazards, Seldovia Quadrangle, Surface, Tides, Tsunami, Volcanoes, geoscientificInformation, Fewer tags

Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska

The Tyonek area in the northwestern Cook Inlet trough is rich in petroleum, coal, geothermal, aggregate, and timber resources, but the detailed geologic mapping necessary for planning future resource development exists only in part of the area. This report and geologic map provide basic surficial-geologic information useful for exploiting those resources and planning future utility corridor developments. In addition to mapping of surficial geologic units, we provide discussion of strategraphic evidence pertaining to physiographic relations and geologic history of volcaniclastic deposits derived from ancestral Mount Spurr, multiple phases of Quaternary glacial activity, Chakachatna River valley landslide complexes...

Tags: Alaska Earthquake 1964, Alluvial Fan, Beluga Plateau, Beluga River, Blockade Glacier, All tags... Capps Glacier, Chakachatna River, Chakachatna-McArthur Embayment, Chalcedony, Chigmit Mountains, Chuitna Coal Project, Chuitna River, Coastal Plain, Colluvium, Cook Inlet, Cook Inlet Basin, Correlation, Debris Avalanche, Depositional Environment, Diamictons, Earthquake Related Slope Failure, Erratics, Fault Displacement, Glacial Geology, Glacier Outburst Flood, Glacioestuarine Deposits, Jasper, Jokulhlaup, Lahar, Landslide Deposit, Little Ice Age, Moraines, Mount Spurr, Neacola Mountains, Neoglacial, Neotectonics, Penultimate Glaciation, Radiocarbon Ages, Rotational Landslide, STATEMAP Project, Sediment Gravity Flow, Straight Creek, Surface Fault Rupture, Surficial Geologic Map, Surficial Geology, Susitna Lowland, Tectonics, Threemile Creek, Till, Tordrillo Mountains, Tyonek, Tyonek Quadrangle, Volcaniclastic Deposits, geoscientificInformation, Fewer tags

Alaska Earthquake March 27, 1964. Seismic shock damage in Anchorage to the Four Seasons Apartment Building which was under construction on unconsolidated material.

Alaska Earthquake March 27, 1964. Seismic shock damage in Anchorage to the Four Seasons Apartment Building which was under construction on unconsolidated material. There were no casualties; five workers left the top (fifth) floor 35 minutes before the earthquake. 1964.

Categories: Image; Tags: Alaska Earthquake 1964, Earthquakes, photo print

Alaska Earthquake March 27, 1964. Damage to houses from landslides in Turnagain Heights in Anchorage.

Alaska Earthquake March 27, 1964. Damage to houses from landslides in Turnagain Heights in Anchorage. Photo by R.A. Page. Pages 24-25 , Earthquake Information Bulletin, v.12, no.1.

Categories: Image; Tags: Alaska Earthquake 1964, Alaska Earthquake March 27, 1964, Earthquakes, Formations, Landslides, All tags... Page R.A., Photographers, photo print, Fewer tags

Tsunami inundation maps of Whittier and western Passage Canal, Alaska

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

Tsunami inundation maps of Sitka, Alaska

The purpose of this study is to evaluate potential tsunami hazards for the community of Sitka. We numerically modeled the extent of inundation from tsunami waves generated by near- and far-field tectonic sources. We performed numerical modeling of historic events at Sitka, 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 Alaska Peninsula region and in the Cascadia subduction zone, and a thrust earthquake in the region of the Queen Charlotte-Fairweather fault zone. Results of numerical modeling combined...

Tags: Active Fault, Alaska Earthquake 1964, Alaska, State of, Baranof Island, Bathymetry, All tags... Coastal, Coastal and River, Earthquake, Emergency Preparedness, Engineering, Engineering Geology, Faulting, Faults, Flood, Geologic Hazards, Geology, Hazards, Inundation, Japonski Island, Modeling, Seismic Hazards, Sitka, Sitka Quadrangle, Sitka Sound, Southeast Alaska, Tides, Tsunami, geoscientificInformation, Fewer tags

Whittier surge wave damage, Alaska. 1964.

Alaska Earthquake March 27, 1964. Indication of the violence of the surge waves that struck Whittier: man holds mounted ten-ply tire through which a 2 by 6-inch plank of wood has been driven by a wave. Published in U.S. Geological Survey Professional paper 541, Figure 31, p.29. 1966. Published in U.S. Geological Survey Professional paper 542-B, Figure 20, p.B-19. 1965.

Categories: Image; Tags: Alaska Earthquake 1964, Alaska Earthquake March 27, 1964, Earthquakes, Glaciers, color transparency (slides)

Tsunami inundation maps of Cordova and Tatitlek, Alaska

The purpose of this study is to evaluate potential tsunami hazards for the Prince William Sound communities of Cordova and Tatitlek. We numerically model the extent of inundation from tsunami waves generated by earthquake sources and consider the results in light of historical observations. Tsunami scenarios include a repeat of the tsunami triggered by the 1964 Great Alaska Earthquake as well as tsunami waves generated by the following hypothetical scenarios: An extended 1964 rupture, a Cascadia megathrust earthquake, various earthquakes in Prince William Sound, and a Tohoku-type earthquake in the Gulf of Alaska region. Results of our numerical modeling, combined with historical observations, are designed to provide...

Tags: Active Fault, Alaska Earthquake 1964, Bathymetry, Coastal, Coastal and River, All tags... Coastal and River Hazards, Earthquake, Earthquake Related Hazards, Emergency Preparedness, Engineering, Engineering Geology, Faulting, Faults, Flood, Geologic Hazards, Geology, Hazards, Inundation, Modeling, Seismic Hazards, Southcentral Alaska, Tides, Tsunami, geoscientificInformation, Fewer tags

Tsunami hazard maps of the Kodiak area, Alaska

This report is intended to provide guidance to local emergency managers in tsunami hazard assessment. Tsunami waves are a real threat for many Alaskan coastal locations, and community preparedness plays an important role in saving lives and property in a case of such a disaster. In this work we used a numerical modeling method to study tsunami waves generated by earthquake sources. We considered several hypothetical tsunami scenarios with a potential to generate tsunami waves that can affect communities in the Kodiak vicinity. Our results confirm that among the earthquake-generated tsunamis we modeled, the 1964 event can be considered a worst-case scenario for future planning. Although our tsunami models included...

Tags: Active Fault, Alaska Earthquake 1964, Alaska, State of, Coastal, Coastal and River, All tags... Earthquake, Earthquake Related Hazards, Emergency Preparedness, Engineering, Engineering Geology, Fault Displacement, Faulting, Faults, Geologic Hazards, Geology, Inundation, Kodiak, Kodiak Island, Kodiak Island Borough Coastal District, Modeling, Seismic Hazards, Surface, Tsunami, geoscientificInformation, Fewer tags