Communities are selected with consideration to their tsunami hazard exposure, location, infrastructure, availability of data, ...

TsunamiReady is a National Weather Service designation for a local government, tribe, or facility that has completed the following preparedness steps: Hazard Mapping: Define local tsunami hazard zones ...

Any large movement of land that causes major displacement of ocean water—from earthquakes, landslides, or volcanic eruptions—can generate a tsunami. Tsunamis generated in Alaska have caused damage and ...

At 10:15pm Alaska time on July 28, a magnitude 8.2 earthquake struck offshore of the Alaska Peninsula, the largest U.S. earthquake in 50 years. The Chignik Earthquake depth was approximately 28.5 ...

Coastal communities in Alaska face some of the most significant tsunami hazards in the United States. Tsunamis can strike within minutes of an earthquake or coastal landslide, making tsunami awareness ...

On July 16, 2025, at 12:37 PM Alaska time, a magnitude 7.3 earthquake struck offshore of the Alaska Peninsula region (Figure 1), two years after a previous magnitude 7.2. This area has been active ...

Earthquakes in Southcentral Alaska are produced by a number of different tectonic features. (1) The strongest earthquakes in Southcentral Alaska are generated by the megathrust fault that marks the ...

Someone recently asked, “Why doesn’t the Alaska Earthquake Center report how long an earthquake lasts?” We could ask in reply, “Do you mean the earthquake itself or the shaking you feel under your ...

Early on August 10, 2025 the Earthquake Center received reports from people out boating of a mysterious local tsunami in the Endicott Arm area of Southeast Alaska, with waves of 10–15 ft near Harbor ...

Seismicity in Southwest Alaska is very sparse. Known faults include the Iditarod-Nixon Fork and the western Denali Fault. Neither fault system has documented historical or Holocene earthquake activity ...