M4.3 Earthquake 74 km NNE of Marybank, New Zealand — September 23, 2025
2025-09-23 23:23:39 UTC (2025-09-23) · approx. 11:23 AM UTC+12 local
On September 23, 2025 at 23:23 UTC, a magnitude 4.3 intermediate depth earthquake struck 74 km NNE of Marybank, New Zealand, at a depth of 124.3 km and coordinates -40.6224°, 173.7016°.0
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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from submitted citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
173.7016°E
Technical Information
Common Questions
How strong was the magnitude 4.3 earthquake near Marybank, New Zealand?
The magnitude 4.3 earthquake that struck 74 km NNE of Marybank, New Zealand on September 23, 2025 at 23:23 UTC had a depth of 124.3 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.
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
Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rcfm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 23, 2025). M4.3 Earthquake 74 km NNE of Marybank, New Zealand — September 23, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rcfm/