M4.7 Earthquake 57 km N of Nuku‘alofa, Tonga — October 15, 2022
2022-10-15 11:40:15 UTC (2022-10-15) · approx. 11:40 PM UTC-12 local
On October 15, 2022 at 11:40 UTC, a magnitude 4.7 shallow crustal earthquake struck 57 km N of Nuku‘alofa, Tonga, at a depth of 11.2 km and coordinates -20.6239°, -175.2234°. This earthquake was detected by 37 seismic stations with good location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Tonga, a region characterized by the Tonga-Kermadec subduction zone, where the Pacific Plate descends at up to 240 mm per year — the fastest plate convergence on Earth. The nearest mapped fault system is the Tonga Trench. View all earthquakes in Tonga.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
-175.2234°E
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Common Questions
How strong was the magnitude 4.7 earthquake near Nuku‘alofa, Tonga?
The magnitude 4.7 earthquake that struck 57 km N of Nuku‘alofa, Tonga on October 15, 2022 at 11:40 UTC had a depth of 11.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -20.6239°, -175.2234°, which is 57 km N of Nuku‘alofa, Tonga. View all earthquakes in Tonga.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Has Tonga had earthquakes this big before?
The largest recorded earthquake in Tonga was the M8.1 Tonga Trench earthquake of June 26, 1917. Today's magnitude 4.7 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000iv8d). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, October 15, 2022). M4.7 Earthquake 57 km N of Nuku‘alofa, Tonga — October 15, 2022. Retrieved December 31, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000iv8d/