M5.3 Earthquake 51 km WSW of Arauco, Argentina — September 23, 2026
2026-09-23 09:21:14 UTC (57 min ago) · approx. 5:21 AM UTC-4 local
Felt by 2 people across nearby locations.
On September 23, 2026 at 09:21 UTC, a magnitude 5.3 intermediate depth earthquake struck 51 km WSW of Arauco, Argentina, at a depth of 121.5 km and coordinates -28.7298°, -67.2912°. This earthquake was detected by 99 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 433, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.3 releases seismic energy equivalent to roughly 1 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.7 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 2 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
-67.2912°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.3 earthquake near Arauco, Argentina?
The magnitude 5.3 earthquake that struck 51 km WSW of Arauco, Argentina on September 23, 2026 at 09:21 UTC had a depth of 121.5 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -28.7298°, -67.2912°, which is 51 km WSW of Arauco, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.3 earthquakes can continue for days to weeks and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000tx29). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 23, 2026). M5.3 Earthquake 51 km WSW of Arauco, Argentina — September 23, 2026. Retrieved September 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tx29/