M4.5 Earthquake 102 km W of San Antonio de los Cobres, Argentina — October 23, 2026
2026-10-23 00:09:35 UTC (3 hours ago) · approx. 8:09 PM UTC-4 local
On October 23, 2026 at 00:09 UTC, a magnitude 4.5 intermediate depth earthquake struck 102 km W of San Antonio de los Cobres, Argentina, at a depth of 185.5 km and coordinates -24.2860°, -67.3224°. This earthquake was detected by 27 seismic stations with good location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.3224°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.5 earthquake that struck 102 km W of San Antonio de los Cobres, Argentina on October 23, 2026 at 00:09 UTC had a depth of 185.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -24.2860°, -67.3224°, which is 102 km W of San Antonio de los Cobres, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000u48i). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 23, 2026). M4.5 Earthquake 102 km W of San Antonio de los Cobres, Argentina — October 23, 2026. Retrieved October 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000u48i/