M3.9 Earthquake 116 km W of San Antonio de los Cobres, Argentina — September 15, 2021
2021-09-15 18:48:35 UTC (2021-09-15) · approx. 2:48 PM UTC-4 local
On September 15, 2021 at 18:48 UTC, a magnitude 3.9 intermediate depth earthquake struck 116 km W of San Antonio de los Cobres, Argentina, at a depth of 194.9 km and coordinates -24.1661°, -67.4601°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.4601°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 3.9 earthquake that struck 116 km W of San Antonio de los Cobres, Argentina on September 15, 2021 at 18:48 UTC had a depth of 194.9 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 3.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000fbk0). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 15, 2021). M3.9 Earthquake 116 km W of San Antonio de los Cobres, Argentina — September 15, 2021. Retrieved November 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fbk0/