M6.4 Earthquake 223 km ESE of Attu Station, Alaska — March 4, 2026
2026-03-04 17:54:36 UTC (2026-03-04) · approx. 5:54 AM UTC+12 local
0Maximum shaking intensity MMI 6.0 (strong).
On March 4, 2026 at 17:54 UTC, a magnitude 6.4 shallow crustal earthquake struck 223 km ESE of Attu Station, Alaska, at a depth of 10.0 km and coordinates 52.3258°, 176.3707°.0 The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 156 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 630, making it a moderate-impact event.
Physical scale: An earthquake of magnitude 6.4 releases seismic energy equivalent to roughly 60 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 16 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Alaska, a region characterized by Pacific Plate subduction beneath the North American Plate, producing frequent megathrust and crustal earthquakes along the Aleutian arc. The nearest mapped fault system is the Aleutian megathrust. View all earthquakes in Alaska.
Learn more: Magnitude scale · Aftershock sequences
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from submitted citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
176.3707°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 6.4 earthquake near Attu Station, Alaska?
The magnitude 6.4 earthquake that struck 223 km ESE of Attu Station, Alaska on March 4, 2026 at 17:54 UTC had a depth of 10.0 km. For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at 52.3258°, 176.3707°, which is 223 km ESE of Attu Station, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 6.4 earthquakes can continue for weeks to months and gradually diminish over time.
Has Alaska had earthquakes this big before?
The largest recorded earthquake in Alaska was the M9.2 Great Alaska earthquake of March 27, 1964. Today's magnitude 6.4 event is significantly smaller than that historical record.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us7000s211). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, March 4, 2026). M6.4 Earthquake 223 km ESE of Attu Station, Alaska — March 4, 2026. Retrieved May 18, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000s211/