M4.1 Earthquake 53 km WNW of San Antonio de los Cobres, Argentina — September 28, 2021
2021-09-28 23:17:20 UTC (2021-09-28) · approx. 7:17 PM UTC-4 local
On September 28, 2021 at 23:17 UTC, a magnitude 4.1 intermediate depth earthquake struck 53 km WNW of San Antonio de los Cobres, Argentina, at a depth of 214.6 km and coordinates -24.0189°, -66.7974°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.7974°E
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Common Questions
How strong was the magnitude 4.1 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.1 earthquake that struck 53 km WNW of San Antonio de los Cobres, Argentina on September 28, 2021 at 23:17 UTC had a depth of 214.6 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000fpy0). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 28, 2021). M4.1 Earthquake 53 km WNW of San Antonio de los Cobres, Argentina — September 28, 2021. Retrieved December 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fpy0/