M5.7 Earthquake near northern Mid-Atlantic Ridge — March 20, 2021
2021-03-20 01:49:17 UTC (2021-03-20) · approx. 11:49 PM UTC-2 local
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On March 20, 2021 at 01:49 UTC, a magnitude 5.7 shallow crustal earthquake struck near northern Mid-Atlantic Ridge, at a depth of 8.0 km and coordinates 47.2964°, -27.2794°.0 The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected.
Physical scale: An earthquake of magnitude 5.7 releases seismic energy equivalent to roughly 5 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 5.2 km — a useful intuition for the size of the slip patch on the fault.
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
-27.2794°E
Technical Information
Common Questions
How strong was the magnitude 5.7 earthquake near northern Mid-Atlantic Ridge?
The magnitude 5.7 earthquake that struck near northern Mid-Atlantic Ridge on March 20, 2021 at 01:49 UTC had a depth of 8.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 47.2964°, -27.2794°, which is near northern Mid-Atlantic Ridge.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.7 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000dl4i). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 20, 2021). M5.7 Earthquake near northern Mid-Atlantic Ridge — March 20, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000dl4i/