M4.0 Earthquake 26 km WNW of Agat Village, Guam — December 19, 2025
2025-12-19 20:56:47 UTC (2025-12-19) · approx. 6:56 AM UTC+10 local
On December 19, 2025 at 20:56 UTC, a magnitude 4.0 intermediate depth earthquake struck 26 km WNW of Agat Village, Guam, at a depth of 122.1 km and coordinates 13.4538°, 144.4261°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
144.4261°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Agat Village, Guam?
The magnitude 4.0 earthquake that struck 26 km WNW of Agat Village, Guam on December 19, 2025 at 20:56 UTC had a depth of 122.1 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 4.0 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 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000rpg7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, December 19, 2025). M4.0 Earthquake 26 km WNW of Agat Village, Guam — December 19, 2025. Retrieved May 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000rpg7/