M4.5 Earthquake 53 km N of Arauco, Argentina — July 26, 2026
2026-07-26 17:29:13 UTC (1 hour ago) · approx. 1:29 PM UTC-4 local
On July 26, 2026 at 17:29 UTC, a magnitude 4.5 intermediate depth earthquake struck 53 km N of Arauco, Argentina, at a depth of 157.1 km and coordinates -28.0972°, -66.7262°. This earthquake was detected by 38 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
-66.7262°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near Arauco, Argentina?
The magnitude 4.5 earthquake that struck 53 km N of Arauco, Argentina on July 26, 2026 at 17:29 UTC had a depth of 157.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -28.0972°, -66.7262°, which is 53 km N of Arauco, 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: us7000t3ia). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 26, 2026). M4.5 Earthquake 53 km N of Arauco, Argentina — July 26, 2026. Retrieved July 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t3ia/