M4.2 Earthquake 183 km NNE of Codrington, Antigua and Barbuda — August 21, 2023
2023-08-21 17:20:39 UTC (2023-08-21) · approx. 1:20 PM UTC-4 local
On August 21, 2023 at 17:20 UTC, a magnitude 4.2 shallow crustal earthquake struck 183 km NNE of Codrington, Antigua and Barbuda, at a depth of 10.0 km and coordinates 19.2311°, -61.3230°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-61.3230°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Codrington, Antigua and Barbuda?
The magnitude 4.2 earthquake that struck 183 km NNE of Codrington, Antigua and Barbuda on August 21, 2023 at 17:20 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000kpxl). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 21, 2023). M4.2 Earthquake 183 km NNE of Codrington, Antigua and Barbuda — August 21, 2023. Retrieved October 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kpxl/