M4.0 Earthquake 283 km WNW of Houma, Tonga — August 28, 2023
2023-08-28 23:55:01 UTC (2023-08-28) · approx. 11:55 AM UTC-12 local
On August 28, 2023 at 23:55 UTC, a magnitude 4.0 deep-focus earthquake struck 283 km WNW of Houma, Tonga, at a depth of 515.5 km and coordinates -20.2874°, -177.8599°.
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
-177.8599°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Houma, Tonga?
The magnitude 4.0 earthquake that struck 283 km WNW of Houma, Tonga on August 28, 2023 at 23:55 UTC had a depth of 515.5 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: us7000ksng). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 28, 2023). M4.0 Earthquake 283 km WNW of Houma, Tonga — August 28, 2023. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000ksng/