M4.7 Earthquake near northern Mid-Atlantic Ridge — September 28, 2021
2021-09-28 10:56:59 UTC (2021-09-28) · approx. 7:56 AM UTC-3 local
On September 28, 2021 at 10:56 UTC, a magnitude 4.7 shallow crustal earthquake struck near northern Mid-Atlantic Ridge, at a depth of 10.0 km and coordinates 32.4697°, -39.9460°.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-39.9460°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake near northern Mid-Atlantic Ridge?
The magnitude 4.7 earthquake that struck near northern Mid-Atlantic Ridge on September 28, 2021 at 10:56 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 32.4697°, -39.9460°, which is near northern Mid-Atlantic Ridge.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000fqtb). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 28, 2021). M4.7 Earthquake near northern Mid-Atlantic Ridge — September 28, 2021. Retrieved December 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fqtb/