M3.1 Earthquake 64 km N of Isabela, Puerto Rico — September 11, 2025
2025-09-11 16:30:38 UTC (2025-09-11) · approx. 12:30 PM UTC-4 local
On September 11, 2025 at 16:30 UTC, a magnitude 3.1 shallow crustal earthquake struck 64 km N of Isabela, Puerto Rico, at a depth of 9.5 km and coordinates 19.0837°, -66.9998°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 607 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 79 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.9998°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Isabela, Puerto Rico?
The magnitude 3.1 earthquake that struck 64 km N of Isabela, Puerto Rico on September 11, 2025 at 16:30 UTC had a depth of 9.5 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71495353). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 11, 2025). M3.1 Earthquake 64 km N of Isabela, Puerto Rico — September 11, 2025. Retrieved September 11, 2025 from https://www.earthquaketracker.org/earthquakes/event/pr71495353/