M 5.5 Moderate Earthquake Strikes Near Attu Station, Alaska

What Happened

A moderate earthquake measuring M 5.5 Mi occurred on February 25, 2026, at 23:46:43 UTC. The seismic event was located approximately 217 km east-southeast of Attu Station, Alaska. The earthquake has been reviewed by seismologists at the USGS.

Location Details

The earthquake occurred at coordinates 51.997°N and 176.071°E. The event was recorded at a depth of 1 km. This is classified as a shallow earthquake; seismic events occurring at depths of less than 20 km are typically felt more intensely by those near the epicenter than deeper quakes.

Impact Assessment

The earthquake reached a Maximum Modified Mercalli Intensity (MMI) of 3.618. According to the source data, the tsunami status is 1, indicating that a tsunami advisory, watch, or information statement was issued following the event. There are currently no felt reports available in the dataset, and no specific reports of damage or injuries have been confirmed.

What You Should Know

Moderate earthquakes (M 5.0-5.9) are capable of causing damage to poorly constructed buildings, though well-built structures usually sustain little to no damage. Residents in the Aleutian Islands region should be prepared for the possibility of aftershocks, which are common following an event of this magnitude.

Source

Data and event details provided by the USGS Earthquake Hazards Program.