M4.2 Earthquake 24 km NNW of Saint John’s, Antigua and Barbuda — December 22, 2021
2021-12-22 23:01:29 UTC (2021-12-22) · approx. 7:01 PM UTC-4 local
On December 22, 2021 at 23:01 UTC, a magnitude 4.2 shallow crustal earthquake struck 24 km NNW of Saint John’s, Antigua and Barbuda, at a depth of 65.9 km and coordinates 17.3265°, -61.9155°.
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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 8 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-61.9155°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Saint John’s, Antigua and Barbuda?
The magnitude 4.2 earthquake that struck 24 km NNW of Saint John’s, Antigua and Barbuda on December 22, 2021 at 23:01 UTC had a depth of 65.9 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: us6000gepf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 22, 2021). M4.2 Earthquake 24 km NNW of Saint John’s, Antigua and Barbuda — December 22, 2021. Retrieved March 1, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gepf/