M4.9 Earthquake south of the Fiji Islands — December 16, 2025
2025-12-16 11:39:33 UTC (2025-12-16) · approx. 11:39 PM UTC+12 local
On December 16, 2025 at 11:39 UTC, a magnitude 4.9 deep-focus earthquake struck south of the Fiji Islands, at a depth of 508.7 km and coordinates -25.9649°, 179.6835°. This earthquake was detected by 65 seismic stations with excellent 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.
The epicenter is located in Fiji, a region characterized by the Fiji Fracture Zone at the junction of the Pacific and Australian plates, with deep-focus seismicity from the subducted slab. View all earthquakes in Fiji.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
179.6835°E
Technical Information
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Common Questions
How strong was the magnitude 4.9 earthquake south of the Fiji Islands?
The magnitude 4.9 earthquake that struck south of the Fiji Islands on December 16, 2025 at 11:39 UTC had a depth of 508.7 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -25.9649°, 179.6835°, which is south of the Fiji Islands. View all earthquakes in Fiji.
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.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000rv9b). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, December 16, 2025). M4.9 Earthquake south of the Fiji Islands — December 16, 2025. Retrieved May 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rv9b/