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A minor magnitude 3.4 earthquake struck 141 km NNE of Vieques, Puerto Rico on Saturday, September 12, 2026 at 08:54:55 PM UTC. This intermediate focal depth (72.0 km depth) released energy equivalent to approximately 2 tons of TNT. Here is the verified PR telemetry, live epicenter map, and ground shaking assessment.
(141 km NNE of)3.4MD
Minor Seismic Class
72.0km
Upper Mantle
19.583° N, 65.273° 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 72.0 km (Upper Mantle / Wadati-Benioff Zone (70–300 km)), this rupture occurred originated within the descending oceanic plate inside the upper mantle. shaking radiates over a wider geographic area with attenuated high frequencies.
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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