M3.9 Earthquake in the Maug Islands region, Northern Mariana Islands — September 12, 2026
2026-09-12 18:50:40 UTC (2026-09-12) · approx. 4:50 AM UTC+10 local
On September 12, 2026 at 18:50 UTC, a magnitude 3.9 intermediate depth earthquake struck in the Maug Islands region, Northern Mariana Islands, at a depth of 172.0 km and coordinates 20.1640°, 144.9983°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
144.9983°E
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Common Questions
How strong was the magnitude 3.9 earthquake in the Maug Islands region, Northern Mariana Islands?
The magnitude 3.9 earthquake that struck in the Maug Islands region, Northern Mariana Islands on September 12, 2026 at 18:50 UTC had a depth of 172.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000ti4c). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 12, 2026). M3.9 Earthquake in the Maug Islands region, Northern Mariana Islands — September 12, 2026. Retrieved September 25, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000ti4c/