M4.4 Earthquake 40 km WNW of Colonia Dora, Argentina — April 23, 2026
2026-04-23 20:32:18 UTC (2026-04-23) · approx. 4:32 PM UTC-4 local
On April 23, 2026 at 20:32 UTC, a magnitude 4.4 deep-focus earthquake struck 40 km WNW of Colonia Dora, Argentina, at a depth of 570.6 km and coordinates -28.4145°, -63.3074°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-63.3074°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake near Colonia Dora, Argentina?
The magnitude 4.4 earthquake that struck 40 km WNW of Colonia Dora, Argentina on April 23, 2026 at 20:32 UTC had a depth of 570.6 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ssf4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, April 23, 2026). M4.4 Earthquake 40 km WNW of Colonia Dora, Argentina — April 23, 2026. Retrieved July 11, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000ssf4/