M4.9 Earthquake near northern Mid-Atlantic Ridge — March 21, 2023
2023-03-21 20:46:54 UTC (2023-03-21) · approx. 5:46 PM UTC-3 local
On March 21, 2023 at 20:46 UTC, a magnitude 4.9 shallow crustal earthquake struck near northern Mid-Atlantic Ridge, at a depth of 10.0 km and coordinates 28.4962°, -43.6257°. This earthquake was detected by 191 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-43.6257°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near northern Mid-Atlantic Ridge?
The magnitude 4.9 earthquake that struck near northern Mid-Atlantic Ridge on March 21, 2023 at 20:46 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 28.4962°, -43.6257°, which is near northern Mid-Atlantic Ridge.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000jlte). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 21, 2023). M4.9 Earthquake near northern Mid-Atlantic Ridge — March 21, 2023. Retrieved May 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jlte/