M4.0 Earthquake 108 km NE of Hihifo, Tonga — October 29, 2024
2024-10-29 17:20:04 UTC (2024-10-29) · approx. 5:20 AM UTC-12 local
On October 29, 2024 at 17:20 UTC, a magnitude 4.0 shallow crustal earthquake struck 108 km NE of Hihifo, Tonga, at a depth of 10.0 km and coordinates -15.1513°, -173.2196°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.0 mainshock that occurred 15 days ago 141 km SSW of Gataivai, Samoa. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-173.2196°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Hihifo, Tonga?
The magnitude 4.0 earthquake that struck 108 km NE of Hihifo, Tonga on October 29, 2024 at 17:20 UTC had a depth of 10.0 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.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 141 km SSW of Gataivai, Samoa. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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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: us7000ns1a). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, October 29, 2024). M4.0 Earthquake 108 km NE of Hihifo, Tonga — October 29, 2024. Retrieved January 16, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000ns1a/