M4.9 Earthquake 77 km NW of Candelaria, Argentina — October 28, 2025
2025-10-28 08:42:19 UTC (2025-10-28) · approx. 4:42 AM UTC-4 local
On October 28, 2025 at 08:42 UTC, a magnitude 4.9 intermediate depth earthquake struck 77 km NW of Candelaria, Argentina, at a depth of 147.1 km and coordinates -31.5078°, -66.3280°. This earthquake was detected by 84 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.3280°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake near Candelaria, Argentina?
The magnitude 4.9 earthquake that struck 77 km NW of Candelaria, Argentina on October 28, 2025 at 08:42 UTC had a depth of 147.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -31.5078°, -66.3280°, which is 77 km NW of Candelaria, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000rjw2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 28, 2025). M4.9 Earthquake 77 km NW of Candelaria, Argentina — October 28, 2025. Retrieved May 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rjw2/