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A minor magnitude 3.3 earthquake struck near LA RIOJA, ARGENTINA on Monday, September 21, 2026 at 05:38:02 PM UTC. This shallow crustal event (16.0 km depth) released energy equivalent to approximately 1 tons of TNT. Here is the verified NSNA telemetry, live epicenter map, and ground shaking assessment.
3.3M
Minor Seismic Class
16.0km
Crustal Layer
30.030° S, 66.690° W
GPS Coordinates
1 tons
TNT Equivalent Power
NSNA
USGS Real-time Feed
A magnitude 3.3 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:
Argentina's seismicity is fundamentally governed by its tectonic setting: Nazca Plate subducting beneath the South American Plate. Major regional fault structures include Andean thrust faults, Punta del Este Fault, Magallanes-Fagnano Fault.
Originating at a depth of 16.0 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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