M3.3 Earthquake 5 km NNE of Aguas Buenas, Puerto Rico — January 4, 2026
2026-01-04 19:47:59 UTC (2026-01-04) · approx. 3:47 PM UTC-4 local
On January 4, 2026 at 19:47 UTC, a magnitude 3.3 intermediate depth earthquake struck 5 km NNE of Aguas Buenas, Puerto Rico, at a depth of 133.0 km and coordinates 18.2970°, -66.0808°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.2 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 107 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.0808°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near Aguas Buenas, Puerto Rico?
The magnitude 3.3 earthquake that struck 5 km NNE of Aguas Buenas, Puerto Rico on January 4, 2026 at 19:47 UTC had a depth of 133.0 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 3.3 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.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71503948). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, January 4, 2026). M3.3 Earthquake 5 km NNE of Aguas Buenas, Puerto Rico — January 4, 2026. Retrieved May 12, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71503948/