M4.2 Earthquake 55 km WNW of San Antonio de los Cobres, Argentina — August 23, 2026
2026-08-23 22:58:07 UTC (5 hours ago) · approx. 6:58 PM UTC-4 local
On August 23, 2026 at 22:58 UTC, a magnitude 4.2 intermediate depth earthquake struck 55 km WNW of San Antonio de los Cobres, Argentina, at a depth of 182.9 km and coordinates -24.1005°, -66.8517°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.8517°E
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Common Questions
How strong was the magnitude 4.2 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.2 earthquake that struck 55 km WNW of San Antonio de los Cobres, Argentina on August 23, 2026 at 22:58 UTC had a depth of 182.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tn15). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 23, 2026). M4.2 Earthquake 55 km WNW of San Antonio de los Cobres, Argentina — August 23, 2026. Retrieved August 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tn15/