M4.5 Earthquake 85 km W of San Antonio de los Cobres, Argentina — September 9, 2025
2025-09-09 17:35:20 UTC (2025-09-09) · approx. 1:35 PM UTC-4 local
On September 9, 2025 at 17:35 UTC, a magnitude 4.5 intermediate depth earthquake struck 85 km W of San Antonio de los Cobres, Argentina, at a depth of 175.0 km and coordinates -24.2893°, -67.1581°. This earthquake was detected by 28 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.1581°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.5 earthquake near San Antonio de los Cobres, Argentina?
The magnitude 4.5 earthquake that struck 85 km W of San Antonio de los Cobres, Argentina on September 9, 2025 at 17:35 UTC had a depth of 175.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -24.2893°, -67.1581°, which is 85 km W of San Antonio de los Cobres, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us7000qv1g). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 9, 2025). M4.5 Earthquake 85 km W of San Antonio de los Cobres, Argentina — September 9, 2025. Retrieved November 30, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qv1g/