M4.3 Earthquake 157 km NW of Neiafu, Tonga — October 19, 2025
2025-10-19 18:50:05 UTC (2025-10-19) · approx. 6:50 AM UTC-12 local
On October 19, 2025 at 18:50 UTC, a magnitude 4.3 intermediate depth earthquake struck 157 km NW of Neiafu, Tonga, at a depth of 241.1 km and coordinates -17.5506°, -174.9229°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-174.9229°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Neiafu, Tonga?
The magnitude 4.3 earthquake that struck 157 km NW of Neiafu, Tonga on October 19, 2025 at 18:50 UTC had a depth of 241.1 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 4.3 earthquakes can continue for several days and gradually diminish over time.
Actions
Location
Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ri6t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 19, 2025). M4.3 Earthquake 157 km NW of Neiafu, Tonga — October 19, 2025. Retrieved January 9, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000ri6t/