M4.5 Earthquake 77 km WNW of El Aguilar, Argentina — August 23, 2026
2026-08-23 17:56:30 UTC (2026-08-23) · approx. 1:56 PM UTC-4 local
On August 23, 2026 at 17:56 UTC, a magnitude 4.5 intermediate depth earthquake struck 77 km WNW of El Aguilar, Argentina, at a depth of 223.2 km and coordinates -23.0699°, -66.4169°. This earthquake was detected by 42 seismic stations with good 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
-66.4169°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.5 earthquake near El Aguilar, Argentina?
The magnitude 4.5 earthquake that struck 77 km WNW of El Aguilar, Argentina on August 23, 2026 at 17:56 UTC had a depth of 223.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -23.0699°, -66.4169°, which is 77 km WNW of El Aguilar, 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: us6000tmzy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 23, 2026). M4.5 Earthquake 77 km WNW of El Aguilar, Argentina — August 23, 2026. Retrieved September 4, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tmzy/