THE ALEUTIAN CRADLE OF TSUNAMIS
(Click here to read EOS Feature: Seismic Sources in the Aleutian Cradle of Tsunamis)
National Seismic Hazard Map 2023
Nearly 75 percent of the U.S. could experience damaging earthquake shaking
Nearly 75 percent of the U.S. could experience damaging earthquake shaking
The 1964 Great Alaska Earthquake Anchorage Walking Tour
Alaska has more large earthquakes than the rest of the United States combined. More than three-quarters of the state’s population live in an area that can experience a magnitude 7 earthquake. Our research provides objective science that helps stakeholders prepare for and mitigate the effects of future earthquakes and tsunamis, which bolsters the economic health and well-being of Alaska and the Nation. The Alaska Earthquake and Tsunami Hazards team conducts field-based research to understand how, where, and why earthquakes and tsunamis occur in Alaska. Our research examines earthquake hazards that contribute to societal risk in Alaska and beyond, including earthquake ground motion, fault slip, surface deformation, landslides and liquefaction triggered by strong ground shaking, and tsunamis.
Sources/Usage: Public Domain. View Media Details
Our research team examines major fault systems in Alaska capable of generating large earthquakes, including the Alaska-Aleutian subduction zone, the Denali Fault system, and the Queen Charlotte-Fairweather Fault system. Many active faults in Alaska are capable of generating large tsunamis that threaten coastal communities in Alaska and beyond.
For example, seafloor deformation during historic Alaska-Aleutian subduction zone earthquakes has generated tsunamis that traveled across the Pacific Ocean and impacted densely populated coasts around the Pacific Rim including Hawaii and the mainland U.S. west coast. The Denali Fault and other active faults in Alaska encroach on populated areas and critical infrastructure, including existing and proposed oil and natural gas pipelines. Our investigation of these fault systems reveals the location, magnitude, and frequency of prehistoric earthquakes and tsunamis, and informs probabilistic assessments that forecast future hazards.
The Alaska Earthquake Hazards Project research equips Alaska and Pacific Rim stakeholders and communities with vital information to improve earthquake and tsunami resilience. Remote but fast-moving faults such as the Queen Charlotte-Fairweather Fault system represent scientific frontier areas, where study improves understanding of earthquake processes that occur on slower-moving faults near densely populated urban centers in the contiguous U.S.
Unveiling Earthquake History
Unveiling Earthquake History
Understanding the past can help inform the future. Scientists deployed two seismographs on the bottom of Skilak Lake in Alaska and eight seismographs on land around the lake. These data can enhance seismic hazard models, leading to more accurate risk assessments and better overall preparedness.
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Current Research:
-
Earthquake Hazards in Southeastern Alaska
-
Characterizing the Active Queen Charlotte-Fairweather Fault System
-
Alaska-Aleutian Subduction Zone Studies
-
Alaska Seismic Hazard Map
-
M7.1 November 30, 2018 Anchorage Earthquake
-
The 1964 Great Alaska Earthquake and Tsunami
Recently Completed Research:
-
Denali Fault Paleoseismology
-
Denali Fault Slip Rate
Tsunami – If you feel shaking for more than 20 seconds and it is difficult to stand, or the tsunami siren is heard move inland to higher ground.
- Story Map: A Hidden Wave Emerges - Tsunami Hazard in Upper Cook Inlet
- Tsunamis in Alaska
- Coastal Alaska is Tsunami Country (Flyer)
Below are other science projects associated with this project.
Hazards in Alaska
A major goal of the U.S. Geological Survey (USGS) is to reduce the vulnerability of the people and areas most at risk from natural hazards. Working with partners throughout all sectors of society, the USGS provides information, products, and knowledge to help build more resilient communities. This site provides important links to a number of hazard related internet sites that provide important...
Alaska Seismic Hazard Map
The National Seismic Hazard Maps developed by the USGS show the spatial probability of peak earthquake-driven ground motion levels. Since the last revisions to the map for Alaska in 2007, scientists have made significant advances in understanding active faulting, fault slip rates, and fault behavior.
Characterizing the Active Queen Charlotte-Fairweather Fault System
This research aims to better characterize the earthquake potential of the southern Fairweather Fault in order to provide more accurate fault source data for the USGS National Seismic Hazard Map. Our approach interrogates lidar data and satellite imagery, applies paleoseismological methods to examine earthquake history, and leverages partnerships with USGS scientists from Colorado and California...
The 1964 Great Alaska Earthquake and Tsunami
On March 27, 1964 at 5:36 p.m. local time an earthquake of magnitude 9.2 occurred in the Prince William Sound region of Alaska, approximately 15.5 miles (25 km) beneath the surface. In addition to the earthquake, the event triggered a major tsunami that caused casualties and damage from the Kodiak Islands to northern California.
Earthquake Hazards in Southeastern Alaska
Over the last 100 years, the Queen Charlotte-Fairweather fault system has produced large-magnitude earthquakes affecting both Canada and the U.S. To fill in missing details about its offshore location and structure, USGS uses sophisticated techniques to truly understand the fault’s hazard potential.
M7.1 November 30, 2018 Anchorage Earthquake
A magnitude 7.1 earthquake struck north of Anchorage, Alaska, on November 30, 2018, at 8:29 a.m. local time (17:29:28 UTC).
Alaska-Aleutian Subduction Zone Studies
Our research team is exploring seismic and aseismic slip along the Alaska-Aleutian arc and studying the prehistoric record of megathrust earthquakes and tsunamis along the Alaska-Aleutian subduction zone Seismic and Aseismic Slip : Tectonic tremor and associated slow slip events represent a newly discovered part of the earthquake cycle. This research aims to understand the process generating...
Below are multimedia items associated with this project.
Filter Total Items: 44
The Aleutian Cradle of Tsunamis
Geologists climb a slope above Larsen Bay, Alaska
Geologists climb a slope above Larsen Bay, Nagai Island, Alaska. Geologists studying coastal evidence of past Alaska-Aleutian subduction zone earthquakes and high tsunamis climb a slope above Larsen Bay on Nagai Island in the Shumagin seismic gap, Alaska.
Geologists climb a slope above Larsen Bay, Nagai Island, Alaska. Geologists studying coastal evidence of past Alaska-Aleutian subduction zone earthquakes and high tsunamis climb a slope above Larsen Bay on Nagai Island in the Shumagin seismic gap, Alaska.
Evidence of turbidity currents in Eklutna Lake
USGS scientists, working with researchers from the University of Ghent, probed the floor of Eklutna Lake, Anchorage Borough, Alaska, for evidence of turbidity currents triggered by strong shaking during the 2018 Mw7.1 Anchorage earthquake.
USGS scientists, working with researchers from the University of Ghent, probed the floor of Eklutna Lake, Anchorage Borough, Alaska, for evidence of turbidity currents triggered by strong shaking during the 2018 Mw7.1 Anchorage earthquake.
USGS scientist investigates cracks along Trunk Road in Wasilla, AK
A USGS scientist investigates cracks along Trunk Road in Wasilla, Alaska. Extensional crack and damage to roadway along S Trunk Rd.
A USGS scientist investigates cracks along Trunk Road in Wasilla, Alaska. Extensional crack and damage to roadway along S Trunk Rd.
A USGS geologist stands in a crack in tide flat sediment, Alaska
A USGS scientist stands in a crack in tide flat sediment that opened during strong shaking in the November 30, 2018 Anchorage earthquake. This upland ground crack near Cottonwood Creek, Palmer Slough had horizontal displacements of ~2.5ft locally and observed maximum depth of ~3ft. The crack was observed ~150ft from the active river channel.
A USGS scientist stands in a crack in tide flat sediment that opened during strong shaking in the November 30, 2018 Anchorage earthquake. This upland ground crack near Cottonwood Creek, Palmer Slough had horizontal displacements of ~2.5ft locally and observed maximum depth of ~3ft. The crack was observed ~150ft from the active river channel.
Measuring a crack in sandy sediment along the Knik River, Alaska
Exposed sand within a extensional crack along the Knik River, Alaska. Measuring a crack in sandy sediment along the south bank of the Knik River. This crack was one of many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Exposed sand within a extensional crack along the Knik River, Alaska. Measuring a crack in sandy sediment along the south bank of the Knik River. This crack was one of many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
2018 Potter Hill landslide 2, Anchorage, AK
Landslide from bluff below rail grade north of Rabbit Creek. Main scarp of slump/flow slide at Potter Hill. Railroad grade is to the left, tidal flat to the right. Note ponded drainage and disrupted slide material.
2018 Anchorage Earthquake
Landslide from bluff below rail grade north of Rabbit Creek. Main scarp of slump/flow slide at Potter Hill. Railroad grade is to the left, tidal flat to the right. Note ponded drainage and disrupted slide material.
2018 Anchorage Earthquake
Cracks at the north end of the Port of Anchorage, Alaska
Lateral spread cracks at the north end of the Port of Anchorage, Alaska. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Lateral spread cracks at the north end of the Port of Anchorage, Alaska. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Close up of cracks at the north end of the Port of Anchorage, Alaska
Lateral spread cracks at northern end of Port of Anchorage. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Lateral spread cracks at northern end of Port of Anchorage. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Chugiak extensional cracks, Chugiak, AK
Extensional cracking and settling around private residence in Chugiak.
2018 Anchorage Earthquake
Extensional cracking and settling around private residence in Chugiak.
2018 Anchorage Earthquake
Ground crack at Sunset Park, Anchorage, AK
Crack observed in 2018 along headscarp of 1964 Government Hill landslide.
2018 Anchorage Earthquake
Crack observed in 2018 along headscarp of 1964 Government Hill landslide.
2018 Anchorage Earthquake
USGS scientists in helicopter conduct an aerial inspection
USGS scientists conduct an aerial inspection of a line of sand vents along the Cook Inlet tide flat at Earthquake Park in Anchorage. Cook Inlet coastal plain liquefaction and bluff raveling near Earthquake Park. These vents opened and ejected sand due to liquefaction triggered by strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
USGS scientists conduct an aerial inspection of a line of sand vents along the Cook Inlet tide flat at Earthquake Park in Anchorage. Cook Inlet coastal plain liquefaction and bluff raveling near Earthquake Park. These vents opened and ejected sand due to liquefaction triggered by strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Earthquake damage of Minnesota Drive onramp, Anchorage, Alaska
Minnesota Blvd off-ramp failure under repair. Construction crews rebuild the Minnesota Drive onramp in Anchorage on December 1, 2018. Engineered fill beneath the onramp failed the day before as a result of strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Minnesota Blvd off-ramp failure under repair. Construction crews rebuild the Minnesota Drive onramp in Anchorage on December 1, 2018. Engineered fill beneath the onramp failed the day before as a result of strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
2018 Potter Hill landslide 1, Anchorage, AK
Slumping along the Alaska Railroad right-of-way evolved into long-runout landslides. The same area failed in earthquakes in 1954 and 1964.
2018 Anchorage Earthquake
Slumping along the Alaska Railroad right-of-way evolved into long-runout landslides. The same area failed in earthquakes in 1954 and 1964.
2018 Anchorage Earthquake
Eklutna Dam after 2018 Anchorage earthquake
Eklutna Lake dam appeared to be undamaged the day after the earthquake; overflights of the lake showed no landslides impacted the lake shoreline.
Eklutna Lake dam appeared to be undamaged the day after the earthquake; overflights of the lake showed no landslides impacted the lake shoreline.
Eagle River landslides, Eagle River, AK
Superficial slides along Eagle River east of Eagle River Loop Road.
2018 Anchorage Earthquake
Superficial slides along Eagle River east of Eagle River Loop Road.
2018 Anchorage Earthquake
Loading ocean bottom seismometers for deployment in the Gulf of Alaska
Ocean bottom seismometers being loaded onto the R/V Sikuliaq to be deployed on the sea floor in the Gulf of Alaska.
Ocean bottom seismometers being loaded onto the R/V Sikuliaq to be deployed on the sea floor in the Gulf of Alaska.
Stratigraphic contact marking 1964 uplift of Montague Island, Alaska
Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake.
Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake.
Sampling sea floor sediment cores from along the Queen Charlotte Fault
USGS and Geological Survey of Canada scientists sample sediment cores collected from the sea floor along the Queen Charlotte Fault. This was taken while they were working with (or in) the Geological Survey of Canada.
USGS and Geological Survey of Canada scientists sample sediment cores collected from the sea floor along the Queen Charlotte Fault. This was taken while they were working with (or in) the Geological Survey of Canada.
Seismic survey of the Queen Charlotte Fault
USGS scientists deploy a seismic streamer aboard the R/V David Starr offshore of southeast Alaska to study the Queen Charlotte Fault.
USGS scientists deploy a seismic streamer aboard the R/V David Starr offshore of southeast Alaska to study the Queen Charlotte Fault.
Investigating a marine terrace along the Fairweather Fault
USGS scientists Kate Scharer, Richard Lease, and Adrian Bender excavate a marine terrace elevated tens of meters above sea level on the west side of the Fairweather Fault. Location: Icy Point, Glacier Bay National Park, Alaska.
USGS scientists Kate Scharer, Richard Lease, and Adrian Bender excavate a marine terrace elevated tens of meters above sea level on the west side of the Fairweather Fault. Location: Icy Point, Glacier Bay National Park, Alaska.
Alaska has more large earthquakes than the rest of the United States combined. More than three-quarters of the state’s population live in an area that can experience a magnitude 7 earthquake. Our research provides objective science that helps stakeholders prepare for and mitigate the effects of future earthquakes and tsunamis, which bolsters the economic health and well-being of Alaska and the Nation. The Alaska Earthquake and Tsunami Hazards team conducts field-based research to understand how, where, and why earthquakes and tsunamis occur in Alaska. Our research examines earthquake hazards that contribute to societal risk in Alaska and beyond, including earthquake ground motion, fault slip, surface deformation, landslides and liquefaction triggered by strong ground shaking, and tsunamis.
Sources/Usage: Public Domain. View Media Details
Our research team examines major fault systems in Alaska capable of generating large earthquakes, including the Alaska-Aleutian subduction zone, the Denali Fault system, and the Queen Charlotte-Fairweather Fault system. Many active faults in Alaska are capable of generating large tsunamis that threaten coastal communities in Alaska and beyond.
For example, seafloor deformation during historic Alaska-Aleutian subduction zone earthquakes has generated tsunamis that traveled across the Pacific Ocean and impacted densely populated coasts around the Pacific Rim including Hawaii and the mainland U.S. west coast. The Denali Fault and other active faults in Alaska encroach on populated areas and critical infrastructure, including existing and proposed oil and natural gas pipelines. Our investigation of these fault systems reveals the location, magnitude, and frequency of prehistoric earthquakes and tsunamis, and informs probabilistic assessments that forecast future hazards.
The Alaska Earthquake Hazards Project research equips Alaska and Pacific Rim stakeholders and communities with vital information to improve earthquake and tsunami resilience. Remote but fast-moving faults such as the Queen Charlotte-Fairweather Fault system represent scientific frontier areas, where study improves understanding of earthquake processes that occur on slower-moving faults near densely populated urban centers in the contiguous U.S.
Unveiling Earthquake History
Unveiling Earthquake History
Understanding the past can help inform the future. Scientists deployed two seismographs on the bottom of Skilak Lake in Alaska and eight seismographs on land around the lake. These data can enhance seismic hazard models, leading to more accurate risk assessments and better overall preparedness.
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Current Research:
-
Earthquake Hazards in Southeastern Alaska
-
Characterizing the Active Queen Charlotte-Fairweather Fault System
-
Alaska-Aleutian Subduction Zone Studies
-
Alaska Seismic Hazard Map
-
M7.1 November 30, 2018 Anchorage Earthquake
-
The 1964 Great Alaska Earthquake and Tsunami
Recently Completed Research:
-
Denali Fault Paleoseismology
-
Denali Fault Slip Rate
Tsunami – If you feel shaking for more than 20 seconds and it is difficult to stand, or the tsunami siren is heard move inland to higher ground.
- Story Map: A Hidden Wave Emerges - Tsunami Hazard in Upper Cook Inlet
- Tsunamis in Alaska
- Coastal Alaska is Tsunami Country (Flyer)
Below are other science projects associated with this project.
Hazards in Alaska
A major goal of the U.S. Geological Survey (USGS) is to reduce the vulnerability of the people and areas most at risk from natural hazards. Working with partners throughout all sectors of society, the USGS provides information, products, and knowledge to help build more resilient communities. This site provides important links to a number of hazard related internet sites that provide important...
Alaska Seismic Hazard Map
The National Seismic Hazard Maps developed by the USGS show the spatial probability of peak earthquake-driven ground motion levels. Since the last revisions to the map for Alaska in 2007, scientists have made significant advances in understanding active faulting, fault slip rates, and fault behavior.
Characterizing the Active Queen Charlotte-Fairweather Fault System
This research aims to better characterize the earthquake potential of the southern Fairweather Fault in order to provide more accurate fault source data for the USGS National Seismic Hazard Map. Our approach interrogates lidar data and satellite imagery, applies paleoseismological methods to examine earthquake history, and leverages partnerships with USGS scientists from Colorado and California...
The 1964 Great Alaska Earthquake and Tsunami
On March 27, 1964 at 5:36 p.m. local time an earthquake of magnitude 9.2 occurred in the Prince William Sound region of Alaska, approximately 15.5 miles (25 km) beneath the surface. In addition to the earthquake, the event triggered a major tsunami that caused casualties and damage from the Kodiak Islands to northern California.
Earthquake Hazards in Southeastern Alaska
Over the last 100 years, the Queen Charlotte-Fairweather fault system has produced large-magnitude earthquakes affecting both Canada and the U.S. To fill in missing details about its offshore location and structure, USGS uses sophisticated techniques to truly understand the fault’s hazard potential.
M7.1 November 30, 2018 Anchorage Earthquake
A magnitude 7.1 earthquake struck north of Anchorage, Alaska, on November 30, 2018, at 8:29 a.m. local time (17:29:28 UTC).
Alaska-Aleutian Subduction Zone Studies
Our research team is exploring seismic and aseismic slip along the Alaska-Aleutian arc and studying the prehistoric record of megathrust earthquakes and tsunamis along the Alaska-Aleutian subduction zone Seismic and Aseismic Slip : Tectonic tremor and associated slow slip events represent a newly discovered part of the earthquake cycle. This research aims to understand the process generating...
Below are multimedia items associated with this project.
Filter Total Items: 44
The Aleutian Cradle of Tsunamis
THE ALEUTIAN CRADLE OF TSUNAMIS
(Click here to read EOS Feature: Seismic Sources in the Aleutian Cradle of Tsunamis)
Geologists climb a slope above Larsen Bay, Alaska
Geologists climb a slope above Larsen Bay, Nagai Island, Alaska. Geologists studying coastal evidence of past Alaska-Aleutian subduction zone earthquakes and high tsunamis climb a slope above Larsen Bay on Nagai Island in the Shumagin seismic gap, Alaska.
Geologists climb a slope above Larsen Bay, Nagai Island, Alaska. Geologists studying coastal evidence of past Alaska-Aleutian subduction zone earthquakes and high tsunamis climb a slope above Larsen Bay on Nagai Island in the Shumagin seismic gap, Alaska.
Evidence of turbidity currents in Eklutna Lake
USGS scientists, working with researchers from the University of Ghent, probed the floor of Eklutna Lake, Anchorage Borough, Alaska, for evidence of turbidity currents triggered by strong shaking during the 2018 Mw7.1 Anchorage earthquake.
USGS scientists, working with researchers from the University of Ghent, probed the floor of Eklutna Lake, Anchorage Borough, Alaska, for evidence of turbidity currents triggered by strong shaking during the 2018 Mw7.1 Anchorage earthquake.
USGS scientist investigates cracks along Trunk Road in Wasilla, AK
A USGS scientist investigates cracks along Trunk Road in Wasilla, Alaska. Extensional crack and damage to roadway along S Trunk Rd.
A USGS scientist investigates cracks along Trunk Road in Wasilla, Alaska. Extensional crack and damage to roadway along S Trunk Rd.
A USGS geologist stands in a crack in tide flat sediment, Alaska
A USGS scientist stands in a crack in tide flat sediment that opened during strong shaking in the November 30, 2018 Anchorage earthquake. This upland ground crack near Cottonwood Creek, Palmer Slough had horizontal displacements of ~2.5ft locally and observed maximum depth of ~3ft. The crack was observed ~150ft from the active river channel.
A USGS scientist stands in a crack in tide flat sediment that opened during strong shaking in the November 30, 2018 Anchorage earthquake. This upland ground crack near Cottonwood Creek, Palmer Slough had horizontal displacements of ~2.5ft locally and observed maximum depth of ~3ft. The crack was observed ~150ft from the active river channel.
Measuring a crack in sandy sediment along the Knik River, Alaska
Exposed sand within a extensional crack along the Knik River, Alaska. Measuring a crack in sandy sediment along the south bank of the Knik River. This crack was one of many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Exposed sand within a extensional crack along the Knik River, Alaska. Measuring a crack in sandy sediment along the south bank of the Knik River. This crack was one of many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
2018 Potter Hill landslide 2, Anchorage, AK
Landslide from bluff below rail grade north of Rabbit Creek. Main scarp of slump/flow slide at Potter Hill. Railroad grade is to the left, tidal flat to the right. Note ponded drainage and disrupted slide material.
2018 Anchorage Earthquake
Landslide from bluff below rail grade north of Rabbit Creek. Main scarp of slump/flow slide at Potter Hill. Railroad grade is to the left, tidal flat to the right. Note ponded drainage and disrupted slide material.
2018 Anchorage Earthquake
Cracks at the north end of the Port of Anchorage, Alaska
Lateral spread cracks at the north end of the Port of Anchorage, Alaska. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Lateral spread cracks at the north end of the Port of Anchorage, Alaska. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Close up of cracks at the north end of the Port of Anchorage, Alaska
Lateral spread cracks at northern end of Port of Anchorage. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Lateral spread cracks at northern end of Port of Anchorage. These cracks were among many that opened across the Anchorage and Mat-Su region due to strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Chugiak extensional cracks, Chugiak, AK
Extensional cracking and settling around private residence in Chugiak.
2018 Anchorage Earthquake
Extensional cracking and settling around private residence in Chugiak.
2018 Anchorage Earthquake
Ground crack at Sunset Park, Anchorage, AK
Crack observed in 2018 along headscarp of 1964 Government Hill landslide.
2018 Anchorage Earthquake
Crack observed in 2018 along headscarp of 1964 Government Hill landslide.
2018 Anchorage Earthquake
USGS scientists in helicopter conduct an aerial inspection
USGS scientists conduct an aerial inspection of a line of sand vents along the Cook Inlet tide flat at Earthquake Park in Anchorage. Cook Inlet coastal plain liquefaction and bluff raveling near Earthquake Park. These vents opened and ejected sand due to liquefaction triggered by strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
USGS scientists conduct an aerial inspection of a line of sand vents along the Cook Inlet tide flat at Earthquake Park in Anchorage. Cook Inlet coastal plain liquefaction and bluff raveling near Earthquake Park. These vents opened and ejected sand due to liquefaction triggered by strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Earthquake damage of Minnesota Drive onramp, Anchorage, Alaska
Minnesota Blvd off-ramp failure under repair. Construction crews rebuild the Minnesota Drive onramp in Anchorage on December 1, 2018. Engineered fill beneath the onramp failed the day before as a result of strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
Minnesota Blvd off-ramp failure under repair. Construction crews rebuild the Minnesota Drive onramp in Anchorage on December 1, 2018. Engineered fill beneath the onramp failed the day before as a result of strong shaking during the M7.1 November 30, 2018 Anchorage earthquake.
2018 Potter Hill landslide 1, Anchorage, AK
Slumping along the Alaska Railroad right-of-way evolved into long-runout landslides. The same area failed in earthquakes in 1954 and 1964.
2018 Anchorage Earthquake
Slumping along the Alaska Railroad right-of-way evolved into long-runout landslides. The same area failed in earthquakes in 1954 and 1964.
2018 Anchorage Earthquake
Eklutna Dam after 2018 Anchorage earthquake
Eklutna Lake dam appeared to be undamaged the day after the earthquake; overflights of the lake showed no landslides impacted the lake shoreline.
Eklutna Lake dam appeared to be undamaged the day after the earthquake; overflights of the lake showed no landslides impacted the lake shoreline.
Eagle River landslides, Eagle River, AK
Superficial slides along Eagle River east of Eagle River Loop Road.
2018 Anchorage Earthquake
Superficial slides along Eagle River east of Eagle River Loop Road.
2018 Anchorage Earthquake
Loading ocean bottom seismometers for deployment in the Gulf of Alaska
Ocean bottom seismometers being loaded onto the R/V Sikuliaq to be deployed on the sea floor in the Gulf of Alaska.
Ocean bottom seismometers being loaded onto the R/V Sikuliaq to be deployed on the sea floor in the Gulf of Alaska.
Stratigraphic contact marking 1964 uplift of Montague Island, Alaska
Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake.
Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake.
Sampling sea floor sediment cores from along the Queen Charlotte Fault
USGS and Geological Survey of Canada scientists sample sediment cores collected from the sea floor along the Queen Charlotte Fault. This was taken while they were working with (or in) the Geological Survey of Canada.
USGS and Geological Survey of Canada scientists sample sediment cores collected from the sea floor along the Queen Charlotte Fault. This was taken while they were working with (or in) the Geological Survey of Canada.
Seismic survey of the Queen Charlotte Fault
USGS scientists deploy a seismic streamer aboard the R/V David Starr offshore of southeast Alaska to study the Queen Charlotte Fault.
USGS scientists deploy a seismic streamer aboard the R/V David Starr offshore of southeast Alaska to study the Queen Charlotte Fault.
Investigating a marine terrace along the Fairweather Fault
USGS scientists Kate Scharer, Richard Lease, and Adrian Bender excavate a marine terrace elevated tens of meters above sea level on the west side of the Fairweather Fault. Location: Icy Point, Glacier Bay National Park, Alaska.
USGS scientists Kate Scharer, Richard Lease, and Adrian Bender excavate a marine terrace elevated tens of meters above sea level on the west side of the Fairweather Fault. Location: Icy Point, Glacier Bay National Park, Alaska.