M4.0 Earthquake 45 km WNW of San Antonio de los Cobres, Argentina — September 12, 2023
2023-09-12 18:38:58 UTC (2023-09-12) · approx. 2:38 PM UTC-4 local
On September 12, 2023 at 18:38 UTC, a magnitude 4.0 intermediate depth earthquake struck 45 km WNW of San Antonio de los Cobres, Argentina, at a depth of 189.0 km and coordinates -24.1383°, -66.7531°.
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
-66.7531°E
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Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.0 earthquake that struck 45 km WNW of San Antonio de los Cobres, Argentina on September 12, 2023 at 18:38 UTC had a depth of 189.0 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: us7000kvc8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 12, 2023). M4.0 Earthquake 45 km WNW of San Antonio de los Cobres, Argentina — September 12, 2023. Retrieved November 18, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kvc8/