M4.1 Earthquake in the Fiji region — October 4, 2025
2025-10-04 21:09:40 UTC (2025-10-04) · approx. 9:09 AM UTC-12 local
On October 4, 2025 at 21:09 UTC, a magnitude 4.1 deep-focus earthquake struck in the Fiji region, at a depth of 655.0 km and coordinates -20.9122°, -179.1043°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-179.1043°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake in the Fiji region?
The magnitude 4.1 earthquake that struck in the Fiji region on October 4, 2025 at 21:09 UTC had a depth of 655.0 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 4.1 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.
Actions
Location
Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000reus). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 4, 2025). M4.1 Earthquake in the Fiji region — October 4, 2025. Retrieved May 27, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000reus/