M3.1 Earthquake 4 km WSW of Fuig, Puerto Rico — September 19, 2026
2026-09-19 05:31:19 UTC (3 hours ago) · approx. 1:31 AM UTC-4 local
On September 19, 2026 at 05:31 UTC, a magnitude 3.1 shallow crustal earthquake struck 4 km WSW of Fuig, Puerto Rico, at a depth of 7.9 km and coordinates 17.9727°, -66.9572°.
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
-66.9572°E
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Common Questions
How strong was the magnitude 3.1 earthquake near Fuig, Puerto Rico?
The magnitude 3.1 earthquake that struck 4 km WSW of Fuig, Puerto Rico on September 19, 2026 at 05:31 UTC had a depth of 7.9 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: pr71532898). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 19, 2026). M3.1 Earthquake 4 km WSW of Fuig, Puerto Rico — September 19, 2026. Retrieved September 19, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71532898/