M4.0 Earthquake 120 km SE of Alo, Wallis and Futuna — April 18, 2025
2025-04-18 17:40:51 UTC (2025-04-18) · approx. 5:40 AM UTC-12 local
On April 18, 2025 at 17:40 UTC, a magnitude 4.0 deep-focus earthquake struck 120 km SE of Alo, Wallis and Futuna, at a depth of 392.6 km and coordinates -15.1554°, -177.4033°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-177.4033°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Alo, Wallis and Futuna?
The magnitude 4.0 earthquake that struck 120 km SE of Alo, Wallis and Futuna on April 18, 2025 at 17:40 UTC had a depth of 392.6 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000pwnv). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 18, 2025). M4.0 Earthquake 120 km SE of Alo, Wallis and Futuna — April 18, 2025. Retrieved June 27, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pwnv/