M4.5 Earthquake near northern Mid-Atlantic Ridge — December 29, 2021
2021-12-29 23:20:26 UTC (2021-12-29) · approx. 8:20 PM UTC-3 local
On December 29, 2021 at 23:20 UTC, a magnitude 4.5 shallow crustal earthquake struck near northern Mid-Atlantic Ridge, at a depth of 10.0 km and coordinates 23.8625°, -45.9713°.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-45.9713°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near northern Mid-Atlantic Ridge?
The magnitude 4.5 earthquake that struck near northern Mid-Atlantic Ridge on December 29, 2021 at 23:20 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 23.8625°, -45.9713°, which is near northern Mid-Atlantic Ridge.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000gali). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 29, 2021). M4.5 Earthquake near northern Mid-Atlantic Ridge — December 29, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000gali/