M4.3 Earthquake 52 km N of Pangai, Tonga — July 23, 2021
2021-07-23 22:37:23 UTC (2021-07-23) · approx. 10:37 AM UTC-12 local
On July 23, 2021 at 22:37 UTC, a magnitude 4.3 shallow crustal earthquake struck 52 km N of Pangai, Tonga, at a depth of 49.9 km and coordinates -19.3401°, -174.3953°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-174.3953°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Pangai, Tonga?
The magnitude 4.3 earthquake that struck 52 km N of Pangai, Tonga on July 23, 2021 at 22:37 UTC had a depth of 49.9 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ezva). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 23, 2021). M4.3 Earthquake 52 km N of Pangai, Tonga — July 23, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000ezva/