M3.8 Earthquake in the Mariana Islands region — November 7, 2025
2025-11-07 16:34:02 UTC (2025-11-07) · approx. 2:34 AM UTC+10 local
On November 7, 2025 at 16:34 UTC, a magnitude 3.8 deep-focus earthquake struck in the Mariana Islands region, at a depth of 353.9 km and coordinates 21.6580°, 143.1069°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
143.1069°E
Technical Information
Common Questions
How strong was the magnitude 3.8 earthquake in the Mariana Islands region?
The magnitude 3.8 earthquake that struck in the Mariana Islands region on November 7, 2025 at 16:34 UTC had a depth of 353.9 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 3.8 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 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000rdyt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, November 7, 2025). M3.8 Earthquake in the Mariana Islands region — November 7, 2025. Retrieved May 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000rdyt/