M3.1 Earthquake 7 km NNW of Trujillo Alto, Puerto Rico — October 6, 2026
2026-10-06 15:42:06 UTC (1 hour ago) · approx. 11:42 AM UTC-4 local
On October 6, 2026 at 15:42 UTC, a magnitude 3.1 intermediate depth earthquake struck 7 km NNW of Trujillo Alto, Puerto Rico, at a depth of 113.0 km and coordinates 18.4088°, -66.0447°.
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
-66.0447°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Trujillo Alto, Puerto Rico?
The magnitude 3.1 earthquake that struck 7 km NNW of Trujillo Alto, Puerto Rico on October 6, 2026 at 15:42 UTC had a depth of 113.0 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 3.1 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: pr71535908). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 6, 2026). M3.1 Earthquake 7 km NNW of Trujillo Alto, Puerto Rico — October 6, 2026. Retrieved October 6, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71535908/