## Breadcrumb

-  Alaska Science Center 
-  Science 

#           The 1964 Great Alaska Earthquake and Tsunami      

  Completed

      By Alaska Science Center      March 25, 2024    

## Video of 1964 Valdez Tsunami

View Video

## 4.5 minutes of shaking

View Event Page

## A Hidden Wave Emerges

### Tsunami Hazard in Upper Cook Inlet

Learn More

## The 1964 Earthquake Survivors

View Video

## 1964 Quake: The Great Alaska Earthquake

View Video

            -              Overview           
            -              Science           
            -              Multimedia           
            -              Publications           
            -              Web Tools           
            -              News           

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.

View Media Details

The magnitude 9.2 Great Alaska Earthquake is the largest recorded earthquake in U.S. history and the second-largest earthquake recorded with modern instruments. The earthquake was felt throughout most of mainland Alaska, as far west as Dutch Harbor in the Aleutian Islands 800 miles away from Anchorage, and at Seattle, Washington, more than 1,200 miles to the southeast of the fault rupture, where the Space Needle swayed perceptibly. The earthquake caused rivers, lakes, and other waterways to slosh as far away as the coasts of Texas and Louisiana. Water-level recorders in 47 states—the entire Nation except for Connecticut, Delaware, and Rhode Island—registered the earthquake. It was so large that it caused the entire Earth to ring like a bell: vibrations that were among the first of their kind ever recorded by modern instruments. 

The Great Alaska Earthquake spawned thousands of lesser aftershocks and hundreds of damaging landslides, submarine slumps, and other ground failures. Alaska’s largest city, Anchorage, located west of the fault rupture, sustained heavy property damage. Tsunamis produced by the earthquake resulted in deaths and damage as far away as Oregon and California. Altogether the earthquake and subsequent tsunamis caused 131 fatalities and an estimated $3.1 billion in property losses (in 2024 dollars).

View Media Details

Geologists from the U.S. Geological Survey (USGS) were the first earth scientists to respond to the devastated region, and they mapped land-level changes resulting from the 1964 earthquake all along the coast of southern Alaska. They were astonished to find that the earthquake was accompanied by vertical shifts of the Earth’s surface over an area two-thirds the size of California. Parts of the coast sank, or subsided, as much as 8 feet, and other parts rose by as much as 38 feet. In addition, geodetic surveys showed that much of coastal Alaska moved seaward at least 50 feet.

It is now recognized that major subduction-zone earthquakes produce a pattern of uplift of the coastline above the shallowest and most seaward part of a rupture, and that subsidence of the coastline occurs farther inland from the rupture. Most of the population of Alaska and its major transportation routes, ports, and infrastructure lie near the eastern segment of the Aleutian Trench that ruptured in the 1964 earthquake. Although the Great Alaska Earthquake was tragic because of the loss of life and property, it provided a wealth of data about subduction-zone earthquakes and the hazards they pose. The leap in scientific understanding that followed the 1964 earthquake has led to major breakthroughs in earth science research worldwide. 

 

VIDEO: The 1964 Tsunami in Valdez, Alaska

## VIDEO: The 1964 Tsunami in Valdez, Alaska

VIDEO: 1964 Quake: The Great Alaska Earthquake

## VIDEO: 1964 Quake: The Great Alaska Earthquake

VIDEO: Geologist George Plafker Public Talk

## VIDEO: Geologist George Plafker Public Talk

Video: Great Alaska Earthquake, 1964 - Magnitude 9.2 - Causes & Effects

## Video: Great Alaska Earthquake, 1964 - Magnitude 9.2 - Causes & Effects

View Media Details

## By the Numbers: 

                                - Magnitude 9.2
                                - Second largest earthquake ever recorded
                                - Shaking lasted 4.5 minutes
                                - 131 fatalities across many states: 115 in AK, 16 in OR and CA                                   - Of those, 119 died in tsunamis triggered by underwater landslides, not by the earthquake-induced tsunami 
                                - $3.1 billion in property losses (2024 dollars)
                                - 36 feet (11m) max uplift on Montague Island
                                - 580-mile section of the fault plane ruptured in ~240 seconds
                                - 185,000 square miles of surface destruction, an area larger than California
                                - Lateral movements up to 67 feet (averaged 27 feet)

##  

## 1964 Earthquake Survivor Stories

### Listen

Listen to the astonishing stories told by survivors, including those at Chenega, as re-told by Henry Fountain (NPR).

Alaska Division of Homeland Security and Emergency Management Get Ready Alaska Survivor Stories:
                                - Dr. James Taylor  - Oct. 25, 2023 (00:08:46) 
                                - Linda Dorner  - April 25, 2023 (00:13:02)
                                - Oliver Holm  - April 12, 2023 (00:33:28)
                                - Marie Lundstrom  - March 22, 2023 (00:35:32)

### Read

1964 Alaskan Earthquake – Personal Accounts (wordpress.com)

 

## **Earthquake and Tsunami Safety:**

### **Earthquakes – Drop Cover and Hold ON!**

                                - Feature Story: The Great ShakeOut
                                - Great Alaska Earthquake, 1964—Magnitude 9.2 —Causes & Effects  (video 6:43)
                                - Alaska—Regional Tectonics and Earthquakes  (video 8:39)
                                - Earthquake Intensity—What controls the shaking you feel?  (video 8:17)
                                - Tectonic Plates—What are the lithospheric plates?  (video 6:39)
                                - How to Prepare for an Earthquake 
                                - What should I do During an earthquake?  (USGS FAQs) 

### **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.**

                                - Valdez Prepared (Tsunami Awareness from 1964 to present)  (video 6:10)
                                - Story Map: A Hidden Wave Emerges - Tsunami Hazard in Upper Cook Inlet  
                                - Tsunamis in Alaska  
                                - The 1964 Tsunami Propagation in the Pacific Ocean
                                - Tsunamis Generated by Megathrust Earthquakes  (video 5:43)

 

## The leap in scientific understanding from the 1964 earthquake has led to:

View Media Details

### The establishment of

                                - USGS Earthquake Hazards Program  (EHP)
                                - NOAA Tsunami Warning System  (NOAA-TWS)
                                - Advanced National Seismic System  (ANSS)
                                - National Earthquake Information Center  (NEIC)
                                - Global Seismographic Network  (GSN)
                                - Alaska Earthquake Center  (AEC) 

### And major breakthroughs in 

                                - Improved building codes
                                - Knowledge of liquefaction  
                                - Knowledge of plate tectonics

 

## Additional Links:

                                - EHP's M9.2 AK Earthquake and Tsunami page
                                - USGS Denver Photo Library showcasing 1964 earthquake photos

link

April 19, 2024

####                 Alaska Seismic Hazard Map              

Alaska Science Center

link

April 19, 2024

####   Alaska Seismic Hazard Map

Learn More

link

March 25, 2024

####                 Hazards in Alaska              

Alaska Science Center

link

March 25, 2024

####   Hazards in Alaska

Learn More

link

January 2, 2024

####                 2023 50-State Long-term National Seismic Hazard Model              

Natural Hazards Mission Area, Earthquake Hazards Program, Geologic Hazards Science Center, Reducing Risk, Science for a Changing World, Subduction Zone Science

link

January 2, 2024

####   2023 50-State Long-term National Seismic Hazard Model

Learn More

link

November 5, 2019

####                 M7.1 November 30, 2018 Anchorage Earthquake              

Alaska Science Center

link

November 5, 2019

####   M7.1 November 30, 2018 Anchorage Earthquake

Learn More

link

February 1, 2019

####                 Alaska Earthquake and Tsunami Hazards              

Earthquake Hazards Program, Alaska Science Center, Subduction Zone Science

link

February 1, 2019

####   Alaska Earthquake and Tsunami Hazards

Learn More

link

October 9, 2018

####                 Alaska-Aleutian Subduction Zone Studies              

Alaska Science Center

link

October 9, 2018

####   Alaska-Aleutian Subduction Zone Studies

Learn More

Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

March 21, 2024

#### Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

link

Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska.

Coastal and Marine Hazards and Resources Program, Alaska Science Center, Pacific Coastal and Marine Science Center

March 21, 2024

#### Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

link

#### Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

link

Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska.

Coastal and Marine Hazards and Resources Program, Alaska Science Center, Pacific Coastal and Marine Science Center

The Aleutian Cradle of Tsunamis

November 4, 2022

#### The Aleutian Cradle of Tsunamis

link

**THE ALEUTIAN CRADLE OF TSUNAMIS **

**(Click here to read EOS Feature: Seismic Sources in the Aleutian Cradle of Tsunamis) **

Natural Hazards, Alaska Science Center, Communications and Publishing

November 4, 2022

#### The Aleutian Cradle of Tsunamis

link

#### The Aleutian Cradle of Tsunamis

link

**THE ALEUTIAN CRADLE OF TSUNAMIS **

**(Click here to read EOS Feature: Seismic Sources in the Aleutian Cradle of Tsunamis) **

Natural Hazards, Alaska Science Center, Communications and Publishing

Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

May 2, 2018

#### Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

link

Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake. 

Alaska Science Center

May 2, 2018

#### Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

link

#### Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

link

Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake. 

Alaska Science Center

March 26, 2014

#### 1964 Quake: The Great Alaska Earthquake (SPANISH)

link

See English version already posted in Gallery 

Natural Hazards Mission Area

March 26, 2014

#### 1964 Quake: The Great Alaska Earthquake (SPANISH)

link

#### 1964 Quake: The Great Alaska Earthquake (SPANISH)

link

See English version already posted in Gallery 

Natural Hazards Mission Area

Turnagain Heights landslide, Anchorage

December 31, 1964

#### Turnagain Heights landslide, Anchorage

link

The Turnagain Heights landslide in Anchorage occurred along a steep bluff fronting Knik Arm of Cook Inlet. Its length, which was parallel to the bluff, was about one and half miles; its width was about a quarter to half a mile. This landslide reduced to rubble many of the finer homes of the city of Anchorage.

Alaska Science Center

December 31, 1964

#### Turnagain Heights landslide, Anchorage

link

#### Turnagain Heights landslide, Anchorage

link

The Turnagain Heights landslide in Anchorage occurred along a steep bluff fronting Knik Arm of Cook Inlet. Its length, which was parallel to the bluff, was about one and half miles; its width was about a quarter to half a mile. This landslide reduced to rubble many of the finer homes of the city of Anchorage.

Alaska Science Center

The village of Portage, Alaska

December 31, 1964

#### The village of Portage, Alaska

link

The village of Portage, Alaska at the head of Turnagain Arm of Cook Inlet, is flooded at high tide as a result of 6 feet of tectonic subsidence during the earthquake.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### The village of Portage, Alaska

link

#### The village of Portage, Alaska

link

The village of Portage, Alaska at the head of Turnagain Arm of Cook Inlet, is flooded at high tide as a result of 6 feet of tectonic subsidence during the earthquake.

Alaska Science Center, Alaska Science Center

The modern wave-cut bedrock surface surrounding Middleton Island

December 31, 1964

#### The modern wave-cut bedrock surface surrounding Middleton Island

link

The modern wave-cut bedrock surface surrounding Middleton Island (the flat surface between the base of the cliffs and the water) was submerged at a comparable stage of tide before the earthquake.

Alaska Science Center

December 31, 1964

#### The modern wave-cut bedrock surface surrounding Middleton Island

link

#### The modern wave-cut bedrock surface surrounding Middleton Island

link

The modern wave-cut bedrock surface surrounding Middleton Island (the flat surface between the base of the cliffs and the water) was submerged at a comparable stage of tide before the earthquake.

Alaska Science Center

Blackstone Bay underwater landslide

December 31, 1964

#### Blackstone Bay underwater landslide

link

An underwater landslide in Blackstone Bay produced a large wave which surged to points 80 feet above sea level. The trees in the photo are about 50  to 75 feet high.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Blackstone Bay underwater landslide

link

#### Blackstone Bay underwater landslide

link

An underwater landslide in Blackstone Bay produced a large wave which surged to points 80 feet above sea level. The trees in the photo are about 50  to 75 feet high.

Alaska Science Center, Alaska Science Center

Railroad tracks

December 31, 1964

#### Railroad tracks

link

The rails in this approach to a railroad bridge near the head of Turnagain Arm were torn from their ties and buckled laterally by channelward movement of the riverbanks during the earthquake. The bridge was also com­ pressed and developed a hump from vertical buckling.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Railroad tracks

link

#### Railroad tracks

link

The rails in this approach to a railroad bridge near the head of Turnagain Arm were torn from their ties and buckled laterally by channelward movement of the riverbanks during the earthquake. The bridge was also com­ pressed and developed a hump from vertical buckling.

Alaska Science Center, Alaska Science Center

Highway near Portage

December 31, 1964

#### Highway near Portage

link

This highway embankment fissured and spread (lurched). The road was built on thick deposits of alluvium and tidal estuary mud along Turnagain Arm near Portage, Alaska. Failure of railway and highway embankments by fissuring and spreading, and by subsidence of the embankments into underlying, earthquake-weakened, unconsolidated deposits.

Alaska Science Center

December 31, 1964

#### Highway near Portage

link

#### Highway near Portage

link

This highway embankment fissured and spread (lurched). The road was built on thick deposits of alluvium and tidal estuary mud along Turnagain Arm near Portage, Alaska. Failure of railway and highway embankments by fissuring and spreading, and by subsidence of the embankments into underlying, earthquake-weakened, unconsolidated deposits.

Alaska Science Center

Whittier waterfront 

December 31, 1964

#### Whittier waterfront 

link

The dock area, a tank farm, and railroad facilities at Whittier were severely damaged by surge-waves developed by underwater landslides in Passage Canal. The waves inundated the area of darkened ground, where the snow was soiled or removed by the waves.

Alaska Science Center

December 31, 1964

#### Whittier waterfront 

link

#### Whittier waterfront 

link

The dock area, a tank farm, and railroad facilities at Whittier were severely damaged by surge-waves developed by underwater landslides in Passage Canal. The waves inundated the area of darkened ground, where the snow was soiled or removed by the waves.

Alaska Science Center

Truck at Lowell Point

December 31, 1964

#### Truck at Lowell Point

link

This truck at Lowell Point, 2 miles from Seward, was bent around a tree by the surge-waves generated by the underwater landslides along the Seward waterfront. The truck was about 32 feet above water level at the time of the earthquake. Many landslides generated by the 1964 earthquake originated beneath, or came to rest within, large bodies of water.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Truck at Lowell Point

link

#### Truck at Lowell Point

link

This truck at Lowell Point, 2 miles from Seward, was bent around a tree by the surge-waves generated by the underwater landslides along the Seward waterfront. The truck was about 32 feet above water level at the time of the earthquake. Many landslides generated by the 1964 earthquake originated beneath, or came to rest within, large bodies of water.

Alaska Science Center, Alaska Science Center

Seward waterfront

December 31, 1964

#### Seward waterfront

link

The waterfront at Seward, looking south, before earthquake-generated underwater landslides, surge-waves, and tsunami waves devastated the water­ front. Note the small boat harbor, the railroad yards, the large docks, and other waterfront facilities which were removed by the underwater land­ slides.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Seward waterfront

link

#### Seward waterfront

link

The waterfront at Seward, looking south, before earthquake-generated underwater landslides, surge-waves, and tsunami waves devastated the water­ front. Note the small boat harbor, the railroad yards, the large docks, and other waterfront facilities which were removed by the underwater land­ slides.

Alaska Science Center, Alaska Science Center

Seward waterfront damage

December 31, 1964

#### Seward waterfront damage

link

The waterfront at Seward a few months after the earthquake, looking north. Note the "scalloped" shoreline left by the underwater landslides, the severed tracks in the railroad yard which dangle over the landslide scarp, and the windrow-like heaps of railroad cars and other debris thrown up by the tsunami waves.

Alaska Science Center

December 31, 1964

#### Seward waterfront damage

link

#### Seward waterfront damage

link

The waterfront at Seward a few months after the earthquake, looking north. Note the "scalloped" shoreline left by the underwater landslides, the severed tracks in the railroad yard which dangle over the landslide scarp, and the windrow-like heaps of railroad cars and other debris thrown up by the tsunami waves.

Alaska Science Center

Government Hill elementary school 

December 31, 1964

#### Government Hill elementary school 

link

Close-up of the elementary school which was destroyed by the Government Hill landslide. Subsidence of the graben at the head of the Government Hill landslide in Anchorage tore apart an elementary school and converted the schoolyard into a jumble of fissures, scarps, and tilted and subsided blocks of broken ground.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Government Hill elementary school 

link

#### Government Hill elementary school 

link

Close-up of the elementary school which was destroyed by the Government Hill landslide. Subsidence of the graben at the head of the Government Hill landslide in Anchorage tore apart an elementary school and converted the schoolyard into a jumble of fissures, scarps, and tilted and subsided blocks of broken ground.

Alaska Science Center, Alaska Science Center

Fourth Avenue landslide, downtown Anchorage

December 31, 1964

#### Fourth Avenue landslide, downtown Anchorage

link

Scarp at the subsidence trough or graben of the Fourth Avenue landslide, downtown Anchorage. Before the earthquake, the sidewalk in front of the stores on the right, which are in the graben, was at the level of the street on the left, which was not involved in the subsidence.

Alaska Science Center

December 31, 1964

#### Fourth Avenue landslide, downtown Anchorage

link

#### Fourth Avenue landslide, downtown Anchorage

link

Scarp at the subsidence trough or graben of the Fourth Avenue landslide, downtown Anchorage. Before the earthquake, the sidewalk in front of the stores on the right, which are in the graben, was at the level of the street on the left, which was not involved in the subsidence.

Alaska Science Center

Uplifted dock on Hinchinbrook Island, Alaska

December 31, 1964

#### Uplifted dock on Hinchinbrook Island, Alaska

link

During the earthquake fundamental changes in the level of the earth's crust occurred in south-central Alaska and adjacent off­ shore areas. Uplifted dock on Hinchinbrook Island, Prince William Sound. Land in this area rose about 8 feet during the earthquake, and the dock can now be used only at extremely high tides. 

Alaska Science Center

December 31, 1964

#### Uplifted dock on Hinchinbrook Island, Alaska

link

#### Uplifted dock on Hinchinbrook Island, Alaska

link

During the earthquake fundamental changes in the level of the earth's crust occurred in south-central Alaska and adjacent off­ shore areas. Uplifted dock on Hinchinbrook Island, Prince William Sound. Land in this area rose about 8 feet during the earthquake, and the dock can now be used only at extremely high tides. 

Alaska Science Center

Turnagain Heights landslide damage, Anchorage

December 31, 1964

#### Turnagain Heights landslide damage, Anchorage

link

Close-up of damaged homes at Turnagain Heights landslide, Anchorage from 1964 earthquake.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Turnagain Heights landslide damage, Anchorage

link

#### Turnagain Heights landslide damage, Anchorage

link

Close-up of damaged homes at Turnagain Heights landslide, Anchorage from 1964 earthquake.

Alaska Science Center, Alaska Science Center

Alaska Railroad damage

December 31, 1964

#### Alaska Railroad damage

link

A series of earthquake-triggered landslides in glacial deposits disrupted almost a mile of The Alaska Railroad mainline at Potter Hill, near Anchorage. Avalanches and especially landslides produced major damage to transportation routes during the 1964 earthquake.

Alaska Science Center

December 31, 1964

#### Alaska Railroad damage

link

#### Alaska Railroad damage

link

A series of earthquake-triggered landslides in glacial deposits disrupted almost a mile of The Alaska Railroad mainline at Potter Hill, near Anchorage. Avalanches and especially landslides produced major damage to transportation routes during the 1964 earthquake.

Alaska Science Center

Rockslide on Sherman Glacier

December 31, 1964

#### Rockslide on Sherman Glacier

link

The 1964 earthquake precipitated some large rockslides in the Chugach Mountains. The debris from this one, which fell on Sherman Glacier, covered about 2 square miles. It originated on the highest mountain in the right background.

Alaska Science Center

December 31, 1964

#### Rockslide on Sherman Glacier

link

#### Rockslide on Sherman Glacier

link

The 1964 earthquake precipitated some large rockslides in the Chugach Mountains. The debris from this one, which fell on Sherman Glacier, covered about 2 square miles. It originated on the highest mountain in the right background.

Alaska Science Center

Earthquake­ triggered avalanche 

December 31, 1964

#### Earthquake­ triggered avalanche 

link

At many places along the mountain front bordering Turnagain Arm, earthquake­ triggered avalanches buried the Seward Highway and the main line of The Alaska Railroad. In this slide the railroad is on top of the embankment at the foot of the mountain; "the highway is at the foot of the embankment, at the edge of the mud flats.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Earthquake­ triggered avalanche 

link

#### Earthquake­ triggered avalanche 

link

At many places along the mountain front bordering Turnagain Arm, earthquake­ triggered avalanches buried the Seward Highway and the main line of The Alaska Railroad. In this slide the railroad is on top of the embankment at the foot of the mountain; "the highway is at the foot of the embankment, at the edge of the mud flats.

Alaska Science Center, Alaska Science Center

#### Pagination

-                Current page            1 
-                Page            2 
-  Next page›› 
-  Last pageLast » 

December 29, 2023

####                 The 2023 US 50-State National Seismic Hazard Model: Overview and implications              

Earthquake Hazards Program, Supplemental Appropriations for Disaster Recovery Activities

September 26, 2022

####                 Seismic sources in the aleutian cradle of tsunamis              

Natural Hazards Mission Area, Earthquake Hazards Program, Alaska Science Center, Geologic Hazards Science Center

June 10, 2020

####                 Submarine landslide kinematics derived from high-resolution imaging in Port Valdez, Alaska              

Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Alaska Science Center, Pacific Coastal and Marine Science Center

July 1, 2014

####                 Maps showing seismic landslide hazards in Anchorage, Alaska              

Natural Hazards Mission Area, Earthquake Hazards Program, Landslide Hazards Program, Geologic Hazards Science Center

April 1, 2014

####                 Why the 1964 Great Alaska Earthquake matters 50 years later              

Groundwater and Streamflow Information Program, Alaska Science Center

March 5, 2014

####                 The 1964 Great Alaska Earthquake and tsunamis: a modern perspective and enduring legacies              

Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center, Subduction Zone Science

January 1, 2014

####                 Source and progression of a submarine landslide and tsunami: The 1964 Great Alaska earthquake at Valdez              

Pacific Coastal and Marine Science Center

January 1, 2010

####                 Historic and paleo-submarine landslide deposits imaged beneath Port Valdez, Alaska: Implications for tsunami generation in a glacial fiord              

Ecosystems Mission Area, Alaska Science Center, Pacific Coastal and Marine Science Center, Woods Hole Coastal and Marine Science Center

January 1, 1964

####                 Alaska's Good Friday earthquake, March 27, 1964, a preliminary geologic evaluation              

August 23, 2022

####                 Did You Feel It?              

Did You Feel It? (DYFI) collects information from people who felt an earthquake and creates a shaking intensity map. Visit the Web Tool to report your experience with an earthquake or to see the shaking intensity map created by the felt reports.

Natural Hazards Mission Area, Earthquake Hazards Program

The Great ShakeOut (2023's Version)

October 17, 2023

####   The Great ShakeOut (2023's Version)

It's that special day of the year again when we all drop, cover, and hold on! It's the Great ShakeOut (2023's Version).

Read Article

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.

View Media Details

The magnitude 9.2 Great Alaska Earthquake is the largest recorded earthquake in U.S. history and the second-largest earthquake recorded with modern instruments. The earthquake was felt throughout most of mainland Alaska, as far west as Dutch Harbor in the Aleutian Islands 800 miles away from Anchorage, and at Seattle, Washington, more than 1,200 miles to the southeast of the fault rupture, where the Space Needle swayed perceptibly. The earthquake caused rivers, lakes, and other waterways to slosh as far away as the coasts of Texas and Louisiana. Water-level recorders in 47 states—the entire Nation except for Connecticut, Delaware, and Rhode Island—registered the earthquake. It was so large that it caused the entire Earth to ring like a bell: vibrations that were among the first of their kind ever recorded by modern instruments. 

The Great Alaska Earthquake spawned thousands of lesser aftershocks and hundreds of damaging landslides, submarine slumps, and other ground failures. Alaska’s largest city, Anchorage, located west of the fault rupture, sustained heavy property damage. Tsunamis produced by the earthquake resulted in deaths and damage as far away as Oregon and California. Altogether the earthquake and subsequent tsunamis caused 131 fatalities and an estimated $3.1 billion in property losses (in 2024 dollars).

View Media Details

Geologists from the U.S. Geological Survey (USGS) were the first earth scientists to respond to the devastated region, and they mapped land-level changes resulting from the 1964 earthquake all along the coast of southern Alaska. They were astonished to find that the earthquake was accompanied by vertical shifts of the Earth’s surface over an area two-thirds the size of California. Parts of the coast sank, or subsided, as much as 8 feet, and other parts rose by as much as 38 feet. In addition, geodetic surveys showed that much of coastal Alaska moved seaward at least 50 feet.

It is now recognized that major subduction-zone earthquakes produce a pattern of uplift of the coastline above the shallowest and most seaward part of a rupture, and that subsidence of the coastline occurs farther inland from the rupture. Most of the population of Alaska and its major transportation routes, ports, and infrastructure lie near the eastern segment of the Aleutian Trench that ruptured in the 1964 earthquake. Although the Great Alaska Earthquake was tragic because of the loss of life and property, it provided a wealth of data about subduction-zone earthquakes and the hazards they pose. The leap in scientific understanding that followed the 1964 earthquake has led to major breakthroughs in earth science research worldwide. 

 

VIDEO: The 1964 Tsunami in Valdez, Alaska

## VIDEO: The 1964 Tsunami in Valdez, Alaska

VIDEO: 1964 Quake: The Great Alaska Earthquake

## VIDEO: 1964 Quake: The Great Alaska Earthquake

VIDEO: Geologist George Plafker Public Talk

## VIDEO: Geologist George Plafker Public Talk

Video: Great Alaska Earthquake, 1964 - Magnitude 9.2 - Causes & Effects

## Video: Great Alaska Earthquake, 1964 - Magnitude 9.2 - Causes & Effects

View Media Details

## By the Numbers: 

                                - Magnitude 9.2
                                - Second largest earthquake ever recorded
                                - Shaking lasted 4.5 minutes
                                - 131 fatalities across many states: 115 in AK, 16 in OR and CA                                   - Of those, 119 died in tsunamis triggered by underwater landslides, not by the earthquake-induced tsunami 
                                - $3.1 billion in property losses (2024 dollars)
                                - 36 feet (11m) max uplift on Montague Island
                                - 580-mile section of the fault plane ruptured in ~240 seconds
                                - 185,000 square miles of surface destruction, an area larger than California
                                - Lateral movements up to 67 feet (averaged 27 feet)

##  

## 1964 Earthquake Survivor Stories

### Listen

Listen to the astonishing stories told by survivors, including those at Chenega, as re-told by Henry Fountain (NPR).

Alaska Division of Homeland Security and Emergency Management Get Ready Alaska Survivor Stories:
                                - Dr. James Taylor  - Oct. 25, 2023 (00:08:46) 
                                - Linda Dorner  - April 25, 2023 (00:13:02)
                                - Oliver Holm  - April 12, 2023 (00:33:28)
                                - Marie Lundstrom  - March 22, 2023 (00:35:32)

### Read

1964 Alaskan Earthquake – Personal Accounts (wordpress.com)

 

## **Earthquake and Tsunami Safety:**

### **Earthquakes – Drop Cover and Hold ON!**

                                - Feature Story: The Great ShakeOut
                                - Great Alaska Earthquake, 1964—Magnitude 9.2 —Causes & Effects  (video 6:43)
                                - Alaska—Regional Tectonics and Earthquakes  (video 8:39)
                                - Earthquake Intensity—What controls the shaking you feel?  (video 8:17)
                                - Tectonic Plates—What are the lithospheric plates?  (video 6:39)
                                - How to Prepare for an Earthquake 
                                - What should I do During an earthquake?  (USGS FAQs) 

### **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.**

                                - Valdez Prepared (Tsunami Awareness from 1964 to present)  (video 6:10)
                                - Story Map: A Hidden Wave Emerges - Tsunami Hazard in Upper Cook Inlet  
                                - Tsunamis in Alaska  
                                - The 1964 Tsunami Propagation in the Pacific Ocean
                                - Tsunamis Generated by Megathrust Earthquakes  (video 5:43)

 

## The leap in scientific understanding from the 1964 earthquake has led to:

View Media Details

### The establishment of

                                - USGS Earthquake Hazards Program  (EHP)
                                - NOAA Tsunami Warning System  (NOAA-TWS)
                                - Advanced National Seismic System  (ANSS)
                                - National Earthquake Information Center  (NEIC)
                                - Global Seismographic Network  (GSN)
                                - Alaska Earthquake Center  (AEC) 

### And major breakthroughs in 

                                - Improved building codes
                                - Knowledge of liquefaction  
                                - Knowledge of plate tectonics

 

## Additional Links:

                                - EHP's M9.2 AK Earthquake and Tsunami page
                                - USGS Denver Photo Library showcasing 1964 earthquake photos

link

April 19, 2024

####                 Alaska Seismic Hazard Map              

Alaska Science Center

link

April 19, 2024

####   Alaska Seismic Hazard Map

Learn More

link

March 25, 2024

####                 Hazards in Alaska              

Alaska Science Center

link

March 25, 2024

####   Hazards in Alaska

Learn More

link

January 2, 2024

####                 2023 50-State Long-term National Seismic Hazard Model              

Natural Hazards Mission Area, Earthquake Hazards Program, Geologic Hazards Science Center, Reducing Risk, Science for a Changing World, Subduction Zone Science

link

January 2, 2024

####   2023 50-State Long-term National Seismic Hazard Model

Learn More

link

November 5, 2019

####                 M7.1 November 30, 2018 Anchorage Earthquake              

Alaska Science Center

link

November 5, 2019

####   M7.1 November 30, 2018 Anchorage Earthquake

Learn More

link

February 1, 2019

####                 Alaska Earthquake and Tsunami Hazards              

Earthquake Hazards Program, Alaska Science Center, Subduction Zone Science

link

February 1, 2019

####   Alaska Earthquake and Tsunami Hazards

Learn More

link

October 9, 2018

####                 Alaska-Aleutian Subduction Zone Studies              

Alaska Science Center

link

October 9, 2018

####   Alaska-Aleutian Subduction Zone Studies

Learn More

Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

March 21, 2024

#### Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

link

Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska.

Coastal and Marine Hazards and Resources Program, Alaska Science Center, Pacific Coastal and Marine Science Center

March 21, 2024

#### Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

link

#### Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska

link

Black and white images show damage caused by the 1964 earthquake and tsunami in Valdez, Alaska.

Coastal and Marine Hazards and Resources Program, Alaska Science Center, Pacific Coastal and Marine Science Center

The Aleutian Cradle of Tsunamis

November 4, 2022

#### The Aleutian Cradle of Tsunamis

link

**THE ALEUTIAN CRADLE OF TSUNAMIS **

**(Click here to read EOS Feature: Seismic Sources in the Aleutian Cradle of Tsunamis) **

Natural Hazards, Alaska Science Center, Communications and Publishing

November 4, 2022

#### The Aleutian Cradle of Tsunamis

link

#### The Aleutian Cradle of Tsunamis

link

**THE ALEUTIAN CRADLE OF TSUNAMIS **

**(Click here to read EOS Feature: Seismic Sources in the Aleutian Cradle of Tsunamis) **

Natural Hazards, Alaska Science Center, Communications and Publishing

Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

May 2, 2018

#### Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

link

Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake. 

Alaska Science Center

May 2, 2018

#### Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

link

#### Stratigraphic contact marking 1964 uplift of Montague Island, Alaska

link

Stratigraphic contact marking uplift of Montague Island, caused by slip on the Patton Bay fault system during the 1964 M9.2 Great ALaska Earthquake. 

Alaska Science Center

March 26, 2014

#### 1964 Quake: The Great Alaska Earthquake (SPANISH)

link

See English version already posted in Gallery 

Natural Hazards Mission Area

March 26, 2014

#### 1964 Quake: The Great Alaska Earthquake (SPANISH)

link

#### 1964 Quake: The Great Alaska Earthquake (SPANISH)

link

See English version already posted in Gallery 

Natural Hazards Mission Area

Turnagain Heights landslide, Anchorage

December 31, 1964

#### Turnagain Heights landslide, Anchorage

link

The Turnagain Heights landslide in Anchorage occurred along a steep bluff fronting Knik Arm of Cook Inlet. Its length, which was parallel to the bluff, was about one and half miles; its width was about a quarter to half a mile. This landslide reduced to rubble many of the finer homes of the city of Anchorage.

Alaska Science Center

December 31, 1964

#### Turnagain Heights landslide, Anchorage

link

#### Turnagain Heights landslide, Anchorage

link

The Turnagain Heights landslide in Anchorage occurred along a steep bluff fronting Knik Arm of Cook Inlet. Its length, which was parallel to the bluff, was about one and half miles; its width was about a quarter to half a mile. This landslide reduced to rubble many of the finer homes of the city of Anchorage.

Alaska Science Center

The village of Portage, Alaska

December 31, 1964

#### The village of Portage, Alaska

link

The village of Portage, Alaska at the head of Turnagain Arm of Cook Inlet, is flooded at high tide as a result of 6 feet of tectonic subsidence during the earthquake.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### The village of Portage, Alaska

link

#### The village of Portage, Alaska

link

The village of Portage, Alaska at the head of Turnagain Arm of Cook Inlet, is flooded at high tide as a result of 6 feet of tectonic subsidence during the earthquake.

Alaska Science Center, Alaska Science Center

The modern wave-cut bedrock surface surrounding Middleton Island

December 31, 1964

#### The modern wave-cut bedrock surface surrounding Middleton Island

link

The modern wave-cut bedrock surface surrounding Middleton Island (the flat surface between the base of the cliffs and the water) was submerged at a comparable stage of tide before the earthquake.

Alaska Science Center

December 31, 1964

#### The modern wave-cut bedrock surface surrounding Middleton Island

link

#### The modern wave-cut bedrock surface surrounding Middleton Island

link

The modern wave-cut bedrock surface surrounding Middleton Island (the flat surface between the base of the cliffs and the water) was submerged at a comparable stage of tide before the earthquake.

Alaska Science Center

Blackstone Bay underwater landslide

December 31, 1964

#### Blackstone Bay underwater landslide

link

An underwater landslide in Blackstone Bay produced a large wave which surged to points 80 feet above sea level. The trees in the photo are about 50  to 75 feet high.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Blackstone Bay underwater landslide

link

#### Blackstone Bay underwater landslide

link

An underwater landslide in Blackstone Bay produced a large wave which surged to points 80 feet above sea level. The trees in the photo are about 50  to 75 feet high.

Alaska Science Center, Alaska Science Center

Railroad tracks

December 31, 1964

#### Railroad tracks

link

The rails in this approach to a railroad bridge near the head of Turnagain Arm were torn from their ties and buckled laterally by channelward movement of the riverbanks during the earthquake. The bridge was also com­ pressed and developed a hump from vertical buckling.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Railroad tracks

link

#### Railroad tracks

link

The rails in this approach to a railroad bridge near the head of Turnagain Arm were torn from their ties and buckled laterally by channelward movement of the riverbanks during the earthquake. The bridge was also com­ pressed and developed a hump from vertical buckling.

Alaska Science Center, Alaska Science Center

Highway near Portage

December 31, 1964

#### Highway near Portage

link

This highway embankment fissured and spread (lurched). The road was built on thick deposits of alluvium and tidal estuary mud along Turnagain Arm near Portage, Alaska. Failure of railway and highway embankments by fissuring and spreading, and by subsidence of the embankments into underlying, earthquake-weakened, unconsolidated deposits.

Alaska Science Center

December 31, 1964

#### Highway near Portage

link

#### Highway near Portage

link

This highway embankment fissured and spread (lurched). The road was built on thick deposits of alluvium and tidal estuary mud along Turnagain Arm near Portage, Alaska. Failure of railway and highway embankments by fissuring and spreading, and by subsidence of the embankments into underlying, earthquake-weakened, unconsolidated deposits.

Alaska Science Center

Whittier waterfront 

December 31, 1964

#### Whittier waterfront 

link

The dock area, a tank farm, and railroad facilities at Whittier were severely damaged by surge-waves developed by underwater landslides in Passage Canal. The waves inundated the area of darkened ground, where the snow was soiled or removed by the waves.

Alaska Science Center

December 31, 1964

#### Whittier waterfront 

link

#### Whittier waterfront 

link

The dock area, a tank farm, and railroad facilities at Whittier were severely damaged by surge-waves developed by underwater landslides in Passage Canal. The waves inundated the area of darkened ground, where the snow was soiled or removed by the waves.

Alaska Science Center

Truck at Lowell Point

December 31, 1964

#### Truck at Lowell Point

link

This truck at Lowell Point, 2 miles from Seward, was bent around a tree by the surge-waves generated by the underwater landslides along the Seward waterfront. The truck was about 32 feet above water level at the time of the earthquake. Many landslides generated by the 1964 earthquake originated beneath, or came to rest within, large bodies of water.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Truck at Lowell Point

link

#### Truck at Lowell Point

link

This truck at Lowell Point, 2 miles from Seward, was bent around a tree by the surge-waves generated by the underwater landslides along the Seward waterfront. The truck was about 32 feet above water level at the time of the earthquake. Many landslides generated by the 1964 earthquake originated beneath, or came to rest within, large bodies of water.

Alaska Science Center, Alaska Science Center

Seward waterfront

December 31, 1964

#### Seward waterfront

link

The waterfront at Seward, looking south, before earthquake-generated underwater landslides, surge-waves, and tsunami waves devastated the water­ front. Note the small boat harbor, the railroad yards, the large docks, and other waterfront facilities which were removed by the underwater land­ slides.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Seward waterfront

link

#### Seward waterfront

link

The waterfront at Seward, looking south, before earthquake-generated underwater landslides, surge-waves, and tsunami waves devastated the water­ front. Note the small boat harbor, the railroad yards, the large docks, and other waterfront facilities which were removed by the underwater land­ slides.

Alaska Science Center, Alaska Science Center

Seward waterfront damage

December 31, 1964

#### Seward waterfront damage

link

The waterfront at Seward a few months after the earthquake, looking north. Note the "scalloped" shoreline left by the underwater landslides, the severed tracks in the railroad yard which dangle over the landslide scarp, and the windrow-like heaps of railroad cars and other debris thrown up by the tsunami waves.

Alaska Science Center

December 31, 1964

#### Seward waterfront damage

link

#### Seward waterfront damage

link

The waterfront at Seward a few months after the earthquake, looking north. Note the "scalloped" shoreline left by the underwater landslides, the severed tracks in the railroad yard which dangle over the landslide scarp, and the windrow-like heaps of railroad cars and other debris thrown up by the tsunami waves.

Alaska Science Center

Government Hill elementary school 

December 31, 1964

#### Government Hill elementary school 

link

Close-up of the elementary school which was destroyed by the Government Hill landslide. Subsidence of the graben at the head of the Government Hill landslide in Anchorage tore apart an elementary school and converted the schoolyard into a jumble of fissures, scarps, and tilted and subsided blocks of broken ground.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Government Hill elementary school 

link

#### Government Hill elementary school 

link

Close-up of the elementary school which was destroyed by the Government Hill landslide. Subsidence of the graben at the head of the Government Hill landslide in Anchorage tore apart an elementary school and converted the schoolyard into a jumble of fissures, scarps, and tilted and subsided blocks of broken ground.

Alaska Science Center, Alaska Science Center

Fourth Avenue landslide, downtown Anchorage

December 31, 1964

#### Fourth Avenue landslide, downtown Anchorage

link

Scarp at the subsidence trough or graben of the Fourth Avenue landslide, downtown Anchorage. Before the earthquake, the sidewalk in front of the stores on the right, which are in the graben, was at the level of the street on the left, which was not involved in the subsidence.

Alaska Science Center

December 31, 1964

#### Fourth Avenue landslide, downtown Anchorage

link

#### Fourth Avenue landslide, downtown Anchorage

link

Scarp at the subsidence trough or graben of the Fourth Avenue landslide, downtown Anchorage. Before the earthquake, the sidewalk in front of the stores on the right, which are in the graben, was at the level of the street on the left, which was not involved in the subsidence.

Alaska Science Center

Uplifted dock on Hinchinbrook Island, Alaska

December 31, 1964

#### Uplifted dock on Hinchinbrook Island, Alaska

link

During the earthquake fundamental changes in the level of the earth's crust occurred in south-central Alaska and adjacent off­ shore areas. Uplifted dock on Hinchinbrook Island, Prince William Sound. Land in this area rose about 8 feet during the earthquake, and the dock can now be used only at extremely high tides. 

Alaska Science Center

December 31, 1964

#### Uplifted dock on Hinchinbrook Island, Alaska

link

#### Uplifted dock on Hinchinbrook Island, Alaska

link

During the earthquake fundamental changes in the level of the earth's crust occurred in south-central Alaska and adjacent off­ shore areas. Uplifted dock on Hinchinbrook Island, Prince William Sound. Land in this area rose about 8 feet during the earthquake, and the dock can now be used only at extremely high tides. 

Alaska Science Center

Turnagain Heights landslide damage, Anchorage

December 31, 1964

#### Turnagain Heights landslide damage, Anchorage

link

Close-up of damaged homes at Turnagain Heights landslide, Anchorage from 1964 earthquake.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Turnagain Heights landslide damage, Anchorage

link

#### Turnagain Heights landslide damage, Anchorage

link

Close-up of damaged homes at Turnagain Heights landslide, Anchorage from 1964 earthquake.

Alaska Science Center, Alaska Science Center

Alaska Railroad damage

December 31, 1964

#### Alaska Railroad damage

link

A series of earthquake-triggered landslides in glacial deposits disrupted almost a mile of The Alaska Railroad mainline at Potter Hill, near Anchorage. Avalanches and especially landslides produced major damage to transportation routes during the 1964 earthquake.

Alaska Science Center

December 31, 1964

#### Alaska Railroad damage

link

#### Alaska Railroad damage

link

A series of earthquake-triggered landslides in glacial deposits disrupted almost a mile of The Alaska Railroad mainline at Potter Hill, near Anchorage. Avalanches and especially landslides produced major damage to transportation routes during the 1964 earthquake.

Alaska Science Center

Rockslide on Sherman Glacier

December 31, 1964

#### Rockslide on Sherman Glacier

link

The 1964 earthquake precipitated some large rockslides in the Chugach Mountains. The debris from this one, which fell on Sherman Glacier, covered about 2 square miles. It originated on the highest mountain in the right background.

Alaska Science Center

December 31, 1964

#### Rockslide on Sherman Glacier

link

#### Rockslide on Sherman Glacier

link

The 1964 earthquake precipitated some large rockslides in the Chugach Mountains. The debris from this one, which fell on Sherman Glacier, covered about 2 square miles. It originated on the highest mountain in the right background.

Alaska Science Center

Earthquake­ triggered avalanche 

December 31, 1964

#### Earthquake­ triggered avalanche 

link

At many places along the mountain front bordering Turnagain Arm, earthquake­ triggered avalanches buried the Seward Highway and the main line of The Alaska Railroad. In this slide the railroad is on top of the embankment at the foot of the mountain; "the highway is at the foot of the embankment, at the edge of the mud flats.

Alaska Science Center, Alaska Science Center

December 31, 1964

#### Earthquake­ triggered avalanche 

link

#### Earthquake­ triggered avalanche 

link

At many places along the mountain front bordering Turnagain Arm, earthquake­ triggered avalanches buried the Seward Highway and the main line of The Alaska Railroad. In this slide the railroad is on top of the embankment at the foot of the mountain; "the highway is at the foot of the embankment, at the edge of the mud flats.

Alaska Science Center, Alaska Science Center

#### Pagination

-                Current page            1 
-                Page            2 
-  Next page›› 
-  Last pageLast » 

December 29, 2023

####                 The 2023 US 50-State National Seismic Hazard Model: Overview and implications              

Earthquake Hazards Program, Supplemental Appropriations for Disaster Recovery Activities

September 26, 2022

####                 Seismic sources in the aleutian cradle of tsunamis              

Natural Hazards Mission Area, Earthquake Hazards Program, Alaska Science Center, Geologic Hazards Science Center

June 10, 2020

####                 Submarine landslide kinematics derived from high-resolution imaging in Port Valdez, Alaska              

Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Alaska Science Center, Pacific Coastal and Marine Science Center

July 1, 2014

####                 Maps showing seismic landslide hazards in Anchorage, Alaska              

Natural Hazards Mission Area, Earthquake Hazards Program, Landslide Hazards Program, Geologic Hazards Science Center

April 1, 2014

####                 Why the 1964 Great Alaska Earthquake matters 50 years later              

Groundwater and Streamflow Information Program, Alaska Science Center

March 5, 2014

####                 The 1964 Great Alaska Earthquake and tsunamis: a modern perspective and enduring legacies              

Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center, Subduction Zone Science

January 1, 2014

####                 Source and progression of a submarine landslide and tsunami: The 1964 Great Alaska earthquake at Valdez              

Pacific Coastal and Marine Science Center

January 1, 2010

####                 Historic and paleo-submarine landslide deposits imaged beneath Port Valdez, Alaska: Implications for tsunami generation in a glacial fiord              

Ecosystems Mission Area, Alaska Science Center, Pacific Coastal and Marine Science Center, Woods Hole Coastal and Marine Science Center

January 1, 1964

####                 Alaska's Good Friday earthquake, March 27, 1964, a preliminary geologic evaluation              

August 23, 2022

####                 Did You Feel It?              

Did You Feel It? (DYFI) collects information from people who felt an earthquake and creates a shaking intensity map. Visit the Web Tool to report your experience with an earthquake or to see the shaking intensity map created by the felt reports.

Natural Hazards Mission Area, Earthquake Hazards Program

The Great ShakeOut (2023's Version)

October 17, 2023

####   The Great ShakeOut (2023's Version)

It's that special day of the year again when we all drop, cover, and hold on! It's the Great ShakeOut (2023's Version).

Read Article