M4.4 Earthquake 156 km S of Alo, Wallis and Futuna — April 23, 2021
2021-04-23 20:38:22 UTC (2021-04-23) · approx. 8:38 AM UTC-12 local
On April 23, 2021 at 20:38 UTC, a magnitude 4.4 shallow crustal earthquake struck 156 km S of Alo, Wallis and Futuna, at a depth of 10.0 km and coordinates -15.7233°, -178.1270°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-178.1270°E
Technical Information
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Common Questions
How strong was the magnitude 4.4 earthquake near Alo, Wallis and Futuna?
The magnitude 4.4 earthquake that struck 156 km S of Alo, Wallis and Futuna on April 23, 2021 at 20:38 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000dykp). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 23, 2021). M4.4 Earthquake 156 km S of Alo, Wallis and Futuna — April 23, 2021. Retrieved July 7, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000dykp/