M3.5 Earthquake 66 km N of Culebra, Puerto Rico — August 17, 2025
2025-08-17 22:39:33 UTC (2025-08-17) · approx. 6:39 PM UTC-4 local
On August 17, 2025 at 22:39 UTC, a magnitude 3.5 shallow crustal earthquake struck 66 km N of Culebra, Puerto Rico, at a depth of 51.0 km and coordinates 18.9015°, -65.3213°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 162 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-65.3213°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Culebra, Puerto Rico?
The magnitude 3.5 earthquake that struck 66 km N of Culebra, Puerto Rico on August 17, 2025 at 22:39 UTC had a depth of 51.0 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2025229001). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 17, 2025). M3.5 Earthquake 66 km N of Culebra, Puerto Rico — August 17, 2025. Retrieved November 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/pr2025229001/