M4.3 Earthquake in the Mariana Islands region — September 17, 2026
2026-09-17 23:06:01 UTC (2026-09-17) · approx. 9:06 AM UTC+10 local
On September 17, 2026 at 23:06 UTC, a magnitude 4.3 intermediate depth earthquake struck in the Mariana Islands region, at a depth of 125.1 km and coordinates 19.3261°, 146.0277°.
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
146.0277°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake in the Mariana Islands region?
The magnitude 4.3 earthquake that struck in the Mariana Islands region on September 17, 2026 at 23:06 UTC had a depth of 125.1 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.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tx4l). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 17, 2026). M4.3 Earthquake in the Mariana Islands region — September 17, 2026. Retrieved October 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tx4l/