M3.9 Earthquake 39 km ENE of Codrington, Antigua and Barbuda — September 28, 2022
2022-09-28 21:37:56 UTC (2022-09-28) · approx. 5:37 PM UTC-4 local
On September 28, 2022 at 21:37 UTC, a magnitude 3.9 shallow crustal earthquake struck 39 km ENE of Codrington, Antigua and Barbuda, at a depth of 30.3 km and coordinates 17.8361°, -61.5128°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-61.5128°E
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Common Questions
How strong was the magnitude 3.9 earthquake near Codrington, Antigua and Barbuda?
The magnitude 3.9 earthquake that struck 39 km ENE of Codrington, Antigua and Barbuda on September 28, 2022 at 21:37 UTC had a depth of 30.3 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000iqtf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 28, 2022). M3.9 Earthquake 39 km ENE of Codrington, Antigua and Barbuda — September 28, 2022. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000iqtf/