M3.1 Earthquake 4 km NNE of Animas, Puerto Rico — September 30, 2026
2026-09-30 21:00:48 UTC (2 hours ago) · approx. 5:00 PM UTC-4 local
On September 30, 2026 at 21:00 UTC, a magnitude 3.1 intermediate depth earthquake struck 4 km NNE of Animas, Puerto Rico, at a depth of 105.4 km and coordinates 18.4778°, -66.6137°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 773 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 88 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.6137°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Animas, Puerto Rico?
The magnitude 3.1 earthquake that struck 4 km NNE of Animas, Puerto Rico on September 30, 2026 at 21:00 UTC had a depth of 105.4 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: pr71535213). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 30, 2026). M3.1 Earthquake 4 km NNE of Animas, Puerto Rico — September 30, 2026. Retrieved September 30, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71535213/