Strong earthquake · March 21, 2026

M 6.6 Earthquake, northern Mid-Atlantic Ridge

A magnitude 6.6 (mww) earthquake struck northern Mid-Atlantic Ridge on March 21, 2026 at 12:16 UTC, at a depth of about 10 km (6 mi), according to the USGS. The USGS PAGER alert level is green.

Updated Jun 4, 2026, 2:37 PM EDT (USGS snapshot)

M 6.6 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	6.6 mww (Strong)
Time (UTC)	Mar 21, 2026, 12:16:46 UTC
U.S. Eastern Time	Mar 21, 2026, 8:16 AM EDT
Location	northern Mid-Atlantic Ridge
Coordinates	23.860° N, 45.799° W
Depth	10.0 km (6.2 mi), shallow
Felt reports	None reported
Tsunami flag	Yes (see note below)
PAGER alert	Green
USGS event ID	us6000si5l

Source: USGS Earthquake Hazards Program, event us6000si5l. Last updated by the USGS Jun 4, 2026, 18:37:56 UTC.

USGS event page View on OpenStreetMap

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.
Local time: The local time at the epicenter is not shown because the area spans more than one time zone or is offshore.

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 4.5	northern Mid-Atlantic Ridge	Oct 1, 2026, 8:24 PM EDT 0 sec ago	10.0 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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