M4.6 Earthquake southwest of Africa — September 19, 2021
2021-09-19 21:52:24 UTC (2021-09-19) · approx. 10:52 PM UTC+1 local
On September 19, 2021 at 21:52 UTC, a magnitude 4.6 shallow crustal earthquake struck southwest of Africa, at a depth of 10.0 km and coordinates -52.3154°, 16.9909°.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
16.9909°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake southwest of Africa?
The magnitude 4.6 earthquake that struck southwest of Africa on September 19, 2021 at 21:52 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 -52.3154°, 16.9909°, which is southwest of Africa.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000fduz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 19, 2021). M4.6 Earthquake southwest of Africa — September 19, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fduz/