Strong earthquake · March 4, 2026

M 6.4 Earthquake, 223 km ESE of Attu Station, Alaska

A magnitude 6.4 (mww) earthquake struck 223 km ESE of Attu Station, Alaska on March 4, 2026 at 17:54 UTC, at a depth of about 10 km (6 mi), according to the USGS. The USGS PAGER alert level is green.

Updated Oct 21, 2026, 2:04 PM EDT (USGS snapshot)

M 6.4 mww PAGER Green Tsunami flag set Reviewed by a seismologist

This is not an early-warning system. For tsunami warnings see tsunami.gov; for emergencies follow local authorities.

Event details
Magnitude	6.4 mww (Strong)
Time (UTC)	Mar 4, 2026, 17:54:36 UTC
Local time at epicenter	Mar 4, 2026, 8:54 AM AKST
U.S. Eastern Time	Mar 4, 2026, 12:54 PM EST
Location	223 km ESE of Attu Station, Alaska
Coordinates	52.326° N, 176.371° E
Depth	10.0 km (6.2 mi), shallow
Felt reports	None reported · max reported intensity 1
ShakeMap intensity	MMI 6 (estimated maximum)
Tsunami flag	Yes (see note below)
PAGER alert	Green
USGS event ID	us7000s211

Source: USGS Earthquake Hazards Program, event us7000s211. Last updated by the USGS Oct 21, 2026, 18:04:49 UTC.

USGS event page View on OpenStreetMap Alaska earthquakes

What the numbers mean

Tsunami flag: The USGS sets this flag for large events in oceanic regions. It does not mean a tsunami happened or will happen. Official tsunami warnings come from the NOAA Tsunami Warning Centers at tsunami.gov.
PAGER alert: An automatic USGS estimate of likely fatalities and economic losses: green (little or none), yellow, orange, or red (highest). It can change as more data arrives.
Felt reports: People who felt shaking can describe it through the USGS "Did You Feel It?" survey on the event page. The count grows for hours or days after an event.

Other recent earthquakes within 300 km

Nearby events from the past 30 days (M 4.5+), past 7 days (M 2.5+), and past year (M 6+)
Magnitude	Location	Time	Depth
M 3.3	237 km SE of Attu Station, Alaska	Oct 21, 2026, 9:57 AM EDT 4 hr ago	5.0 km
M 4.6	193 km SE of Attu Station, Alaska	Oct 12, 2026, 10:29 AM EDT 9 days ago	10.0 km
M 6.1	Rat Islands, Aleutian Islands, Alaska	May 9, 2026, 12:42 AM EDT 166 days ago	16.3 km

After an earthquake

Expect aftershocks. If you are near the coast and feel strong or long shaking, move to high ground right away without waiting for an official warning. Check on neighbors and follow instructions from local emergency officials.

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