M4.6 Earthquake southeast of the Loyalty Islands — September 3, 2025
2025-09-03 23:07:11 UTC (2025-09-03) · approx. 10:07 AM UTC+11 local
On September 3, 2025 at 23:07 UTC, a magnitude 4.6 shallow crustal earthquake struck southeast of the Loyalty Islands, at a depth of 10.0 km and coordinates -23.2002°, 172.4082°. This earthquake was detected by 14 seismic stations with moderate location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
172.4082°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake southeast of the Loyalty Islands?
The magnitude 4.6 earthquake that struck southeast of the Loyalty Islands on September 3, 2025 at 23:07 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 -23.2002°, 172.4082°, which is southeast of the Loyalty Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000rd5s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 3, 2025). M4.6 Earthquake southeast of the Loyalty Islands — September 3, 2025. Retrieved November 30, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000rd5s/