M4.2 Earthquake 150 km WNW of Haveluloto, Tonga — October 5, 2021
2021-10-05 19:08:46 UTC (2021-10-05) · approx. 7:08 AM UTC-12 local
On October 5, 2021 at 19:08 UTC, a magnitude 4.2 deep-focus earthquake struck 150 km WNW of Haveluloto, Tonga, at a depth of 302.6 km and coordinates -20.6461°, -176.5601°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-176.5601°E
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Common Questions
How strong was the magnitude 4.2 earthquake near Haveluloto, Tonga?
The magnitude 4.2 earthquake that struck 150 km WNW of Haveluloto, Tonga on October 5, 2021 at 19:08 UTC had a depth of 302.6 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ft17). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 5, 2021). M4.2 Earthquake 150 km WNW of Haveluloto, Tonga — October 5, 2021. Retrieved December 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000ft17/