M4.1 Earthquake 294 km W of Houma, Tonga — July 13, 2026
2026-07-13 21:35:45 UTC (2026-07-13) · approx. 9:35 AM UTC-12 local
On July 13, 2026 at 21:35 UTC, a magnitude 4.1 deep-focus earthquake struck 294 km W of Houma, Tonga, at a depth of 419.3 km and coordinates -21.3672°, -178.1368°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-178.1368°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Houma, Tonga?
The magnitude 4.1 earthquake that struck 294 km W of Houma, Tonga on July 13, 2026 at 21:35 UTC had a depth of 419.3 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000t1dg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 13, 2026). M4.1 Earthquake 294 km W of Houma, Tonga — July 13, 2026. Retrieved August 3, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t1dg/