M5.3 Earthquake 47 km NNE of Chilecito, Argentina — September 23, 2026
2026-09-23 09:21:14 UTC (2026-09-23) · approx. 5:21 AM UTC-4 local
Felt by 4 people across nearby locations.
On September 23, 2026 at 09:21 UTC, a magnitude 5.3 intermediate depth earthquake struck 47 km NNE of Chilecito, Argentina, at a depth of 121.4 km and coordinates -28.7705°, -67.3020°. This earthquake was detected by 195 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 434, 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.
The epicenter is located in Chile, a region characterized by the Peru-Chile Trench, where the Nazca Plate subducts beneath South America at 65-80 mm per year. The nearest mapped fault system is the Peru-Chile Trench. View all earthquakes in Chile.
Learn more: Magnitude scale · Aftershock sequences
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
-67.3020°E
Technical Information
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Common Questions
How strong was the magnitude 5.3 earthquake near Chilecito, Argentina?
The magnitude 5.3 earthquake that struck 47 km NNE of Chilecito, Argentina on September 23, 2026 at 09:21 UTC had a depth of 121.4 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -28.7705°, -67.3020°, which is 47 km NNE of Chilecito, Argentina. View all earthquakes in Chile.
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.
Has Chile had earthquakes this big before?
The largest recorded earthquake in Chile was the M9.5 Great Chilean earthquake of May 22, 1960. Today's magnitude 5.3 event is significantly smaller than that historical record.
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Location
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 47 km NNE of Chilecito, Argentina — September 23, 2026. Retrieved October 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tx29/