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A minor magnitude 3.4 earthquake struck 157 km NNE of Vieques, Puerto Rico on Saturday, September 12, 2026 at 11:01:48 PM UTC. This shallow crustal event (21.6 km depth) released energy equivalent to approximately 2 tons of TNT. Here is the verified PR telemetry, live epicenter map, and ground shaking assessment.
(157 km NNE of)3.4MD
Minor Seismic Class
21.6km
Crustal Layer
19.766° N, 65.329° W
GPS Coordinates
2 tons
TNT Equivalent Power
PR
USGS Real-time Feed
A magnitude 3.4 event is classified as a minor earthquake. Often felt by people indoors, especially on upper floors. Hanging objects may swing slightly; structural damage is extremely rare.
Felt by almost no one except under extraordinarily favorable conditions.
Felt by almost no one except under extraordinarily favorable conditions.
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Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Because seismic scales are logarithmic, each whole integer increase represents:
Puerto Rico's seismicity is fundamentally governed by its tectonic setting: Located on the Puerto Rico-Virgin Islands microplate between the North American Plate to the north (Puerto Rico Trench) and Caribbean Plate to the south (Muertos Trough). Major regional fault structures include Puerto Rico Trench, Muertos Trough, Mona Passage Faults, Great Northern Puerto Rico Fault Zone.
Originating at a depth of 21.6 km (Earth's Crust (0–70 km)), this rupture occurred occurred within the brittle upper crust. shallow earthquakes produce the highest peak ground acceleration and the sharpest surface shaking.
Micro-tremors and minor events of this scale are part of ongoing background tectonic relaxation. While isolated micro-aftershocks may occur, the likelihood of a damaging secondary event remains statistically low under normal seismic conditions.
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