M4.0 Earthquake 100 km W of San Antonio de los Cobres, Argentina — September 7, 2021
2021-09-07 23:57:57 UTC (2021-09-07) · approx. 7:57 PM UTC-4 local
On September 7, 2021 at 23:57 UTC, a magnitude 4.0 intermediate depth earthquake struck 100 km W of San Antonio de los Cobres, Argentina, at a depth of 206.9 km and coordinates -24.2848°, -67.3037°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.3037°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.0 earthquake that struck 100 km W of San Antonio de los Cobres, Argentina on September 7, 2021 at 23:57 UTC had a depth of 206.9 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000f938). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 7, 2021). M4.0 Earthquake 100 km W of San Antonio de los Cobres, Argentina — September 7, 2021. Retrieved November 17, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f938/