M4.0 Earthquake 295 km W of Haveluloto, Tonga — October 11, 2020
2020-10-11 21:47:32 UTC (2020-10-11) · approx. 9:47 AM UTC-12 local
On October 11, 2020 at 21:47 UTC, a magnitude 4.0 deep-focus earthquake struck 295 km W of Haveluloto, Tonga, at a depth of 507.1 km and coordinates -20.6836°, -178.0091°.
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
-178.0091°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Haveluloto, Tonga?
The magnitude 4.0 earthquake that struck 295 km W of Haveluloto, Tonga on October 11, 2020 at 21:47 UTC had a depth of 507.1 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: us6000c8j3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 11, 2020). M4.0 Earthquake 295 km W of Haveluloto, Tonga — October 11, 2020. Retrieved December 19, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000c8j3/