M4.4 Earthquake 161 km SW of Merizo Village, Guam — September 28, 2025
2025-09-28 23:11:28 UTC (2025-09-28) · approx. 9:11 AM UTC+10 local
On September 28, 2025 at 23:11 UTC, a magnitude 4.4 shallow crustal earthquake struck 161 km SW of Merizo Village, Guam, at a depth of 35.0 km and coordinates 12.2494°, 143.6067°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
143.6067°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake near Merizo Village, Guam?
The magnitude 4.4 earthquake that struck 161 km SW of Merizo Village, Guam on September 28, 2025 at 23:11 UTC had a depth of 35.0 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 4.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ribd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 28, 2025). M4.4 Earthquake 161 km SW of Merizo Village, Guam — September 28, 2025. Retrieved December 11, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000ribd/