M3.4 Earthquake 120 km NNE of Vieques, Puerto Rico — August 23, 2026
2026-08-23 07:21:55 UTC (6 hours ago) · approx. 3:21 AM UTC-4 local
On August 23, 2026 at 07:21 UTC, a magnitude 3.4 shallow crustal earthquake struck 120 km NNE of Vieques, Puerto Rico, at a depth of 45.6 km and coordinates 19.4295°, -65.3983°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 2.0 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 136 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-65.3983°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Vieques, Puerto Rico?
The magnitude 3.4 earthquake that struck 120 km NNE of Vieques, Puerto Rico on August 23, 2026 at 07:21 UTC had a depth of 45.6 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71529478). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 23, 2026). M3.4 Earthquake 120 km NNE of Vieques, Puerto Rico — August 23, 2026. Retrieved August 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71529478/