M4.3 Earthquake 115 km NW of San Antonio de los Cobres, Argentina — September 20, 2021
2021-09-20 20:49:19 UTC (2021-09-20) · approx. 4:49 PM UTC-4 local
On September 20, 2021 at 20:49 UTC, a magnitude 4.3 intermediate depth earthquake struck 115 km NW of San Antonio de los Cobres, Argentina, at a depth of 212.4 km and coordinates -23.4543°, -67.0925°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.0925°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.3 earthquake that struck 115 km NW of San Antonio de los Cobres, Argentina on September 20, 2021 at 20:49 UTC had a depth of 212.4 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000fd05). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 20, 2021). M4.3 Earthquake 115 km NW of San Antonio de los Cobres, Argentina — September 20, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fd05/