M4.9 Earthquake 40 km N of San Agustín de Valle Fértil, Argentina — August 22, 2025
2025-08-22 20:42:25 UTC (2025-08-22) · approx. 4:42 PM UTC-4 local
Felt by 4 people across nearby locations.
On August 22, 2025 at 20:42 UTC, a magnitude 4.9 shallow crustal earthquake struck 40 km N of San Agustín de Valle Fértil, Argentina, at a depth of 30.9 km and coordinates -30.2701°, -67.4064°. This earthquake was detected by 103 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 371, 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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 4 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-67.4064°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake near San Agustín de Valle Fértil, Argentina?
The magnitude 4.9 earthquake that struck 40 km N of San Agustín de Valle Fértil, Argentina on August 22, 2025 at 20:42 UTC had a depth of 30.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -30.2701°, -67.4064°, which is 40 km N of San Agustín de Valle Fértil, 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.
Authoritative source: USGS event page (event ID: us6000r37j). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 22, 2025). M4.9 Earthquake 40 km N of San Agustín de Valle Fértil, Argentina — August 22, 2025. Retrieved November 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000r37j/