M4.9 Earthquake south of the Kermadec Islands — September 2, 2025
2025-09-02 17:10:35 UTC (2025-09-02) · approx. 5:10 AM UTC-12 local
On September 2, 2025 at 17:10 UTC, a magnitude 4.9 shallow crustal earthquake struck south of the Kermadec Islands, at a depth of 10.0 km and coordinates -33.1049°, -178.5670°. This earthquake was detected by 31 seismic stations with good location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-178.5670°E
Technical Information
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Common Questions
How strong was the magnitude 4.9 earthquake south of the Kermadec Islands?
The magnitude 4.9 earthquake that struck south of the Kermadec Islands on September 2, 2025 at 17:10 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -33.1049°, -178.5670°, which is south of the Kermadec Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000qtbw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 2, 2025). M4.9 Earthquake south of the Kermadec Islands — September 2, 2025. Retrieved November 19, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qtbw/