Magnitude 5.6 Quake Rocks Alaska on Thanksgiving

Alaska Shaken by Thanksgiving Earthquake

A powerful earthquake struck Alaska on Thanksgiving Day, November 27, 2025, sending tremors across the state's most populated region. The magnitude 5.6 quake, initially reported as a 6.0 by the U.S. Geological Survey (USGS), occurred at 8:11 a.m. local time near the Susitna area, approximately 38 miles northwest of Anchorage.

According to the USGS, the earthquake originated at a depth of 46.8 miles, which helped mitigate surface damage despite its significant strength. Moderate shaking was reported in Anchorage, Alaska's largest city, while lighter tremors were felt hundreds of miles south of the epicenter. No injuries, structural damage, or tsunami threats were immediately confirmed by authorities.

USGS Provides Key Details

The USGS played a crucial role in accurately assessing the earthquake. "Originally declared a magnitude 6.0, the U.S. Geological Survey downgraded the earthquake to a magnitude 5.6 shortly after it occurred," reports indicate. This rapid adjustment highlights the importance of real-time seismic monitoring by federal agencies.

Geological experts from the USGS and the Alaska Earthquake Center noted that the tremor occurred at the boundary of the Pacific and North American tectonic plates—a region known for high seismic activity.

"Alaska experiences more earthquakes than any other region in the U.S., due to its location on the active Ring of Fire,"

explained Alaska State Troopers officials.

Historical Context and Safety

While this event was significant, it pales in comparison to Alaska's seismic history. The state was the epicenter of the 1964 Good Friday earthquake, a magnitude 9.2—the second-largest ever recorded—devastating Prince William Sound. Modern infrastructure and advanced warning systems, like those operated by the USGS and National Tsunami Warning Center, help mitigate risks during such events.

Following the Thanksgiving quake, Alaska's Department of Transportation immediately began inspections of bridges, highways, and airports to ensure structural integrity. The USGS also assessed landslide risks, concluding that "little or no landsliding is expected from this earthquake."

Why Alaska's Seismic Activity Matters

Alaska's position between colliding tectonic plates makes it uniquely vulnerable to earthquakes. Understanding these phenomena through data from institutions like the USGS helps scientists predict and prepare for future events. Residents are urged to have emergency kits and know earthquake safety protocols, such as "Drop, Cover, and Hold On."

As investigations continue, authorities remain vigilant. "This is a developing story," officials noted, emphasizing the need for ongoing monitoring in this earthquake-prone region.

[IMAGE_1: USGS map showing the epicenter of the Susitna earthquake near Anchorage]

[IMAGE_2: Susitna River in Alaska with mountains in the background]