M3.8 Earthquake 112 km NNW of San Antonio de los Cobres, Argentina — April 7, 2021
2021-04-07 21:28:20 UTC (2021-04-07) · approx. 5:28 PM UTC-4 local
On April 7, 2021 at 21:28 UTC, a magnitude 3.8 intermediate depth earthquake struck 112 km NNW of San Antonio de los Cobres, Argentina, at a depth of 211.4 km and coordinates -23.3498°, -66.8972°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.8972°E
Technical Information
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Common Questions
How strong was the magnitude 3.8 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 3.8 earthquake that struck 112 km NNW of San Antonio de los Cobres, Argentina on April 7, 2021 at 21:28 UTC had a depth of 211.4 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000dzus). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 7, 2021). M3.8 Earthquake 112 km NNW of San Antonio de los Cobres, Argentina — April 7, 2021. Retrieved June 12, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dzus/