M4.6 Earthquake in the Samoa Islands region — April 25, 2021
2021-04-25 21:07:08 UTC (2021-04-25) · approx. 9:07 AM UTC-12 local
On April 25, 2021 at 21:07 UTC, a magnitude 4.6 shallow crustal earthquake struck in the Samoa Islands region, at a depth of 10.0 km and coordinates -14.9447°, -173.2308°.
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
-173.2308°E
Technical Information
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Common Questions
How strong was the magnitude 4.6 earthquake in the Samoa Islands region?
The magnitude 4.6 earthquake that struck in the Samoa Islands region on April 25, 2021 at 21:07 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 -14.9447°, -173.2308°, which is in the Samoa Islands region.
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.
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Location
Authoritative source: USGS event page (event ID: us6000e4rd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 25, 2021). M4.6 Earthquake in the Samoa Islands region — April 25, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000e4rd/