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A moderate magnitude 5.3 earthquake struck 51 km WSW of Arauco, Argentina on Wednesday, September 23, 2026 at 09:21:14 AM UTC. This intermediate focal depth (121.5 km depth) released energy equivalent to approximately 1.3 kt of TNT. Here is the verified US telemetry, live epicenter map, and ground shaking assessment.
(51 km WSW of)5.3MWW
Moderate Seismic Class
121.5km
Upper Mantle
28.730° S, 67.291° W
GPS Coordinates
1.3 kt
TNT Equivalent Power
US
USGS Real-time Feed
A magnitude 5.3 event is classified as a moderate earthquake. Can cause slight to moderate damage to poorly constructed buildings. Felt widely across nearby communities within dozens of kilometers.
Felt by many indoors. Dishes, windows rattle; walls make creaking sound.
Felt by many indoors. Dishes, windows rattle; walls make creaking sound.
Felt by many indoors. Dishes, windows rattle; walls make creaking sound.
Felt indoors. Hanging objects swing slightly. Vibration like a passing light truck.
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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 121.5 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.
Following an earthquake of magnitude 5.3, an active aftershock sequence is expected over the coming days and weeks. In accordance with Omori's Law and Båth's Law of seismology, secondary tremors decrease in frequency over time, with the largest expected aftershock historically averaging approximately 1.0 to 1.2 magnitude units below the mainshock. Local residents should remain vigilant for secondary shaking, particularly when inspecting older structures or unreinforced masonry.
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