M4.3 Earthquake 53 km WSW of San Antonio, Chile — September 24, 2026
2026-09-24 07:07:05 UTC (2026-09-24) · approx. 2:07 AM UTC-5 local
On September 24, 2026 at 07:07 UTC, a magnitude 4.3 shallow crustal earthquake struck 53 km WSW of San Antonio, Chile, at a depth of 31.4 km and coordinates -33.8294°, -72.1057°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.2 mainshock that occurred 10 days ago 69 km SW of San Antonio, Chile. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-72.1057°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near San Antonio, Chile?
The magnitude 4.3 earthquake that struck 53 km WSW of San Antonio, Chile on September 24, 2026 at 07:07 UTC had a depth of 31.4 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 4.3 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.2 one earlier?
No. This magnitude 4.3 earthquake is an aftershock of the larger magnitude 5.2 mainshock that occurred earlier 69 km SW of San Antonio, Chile. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tx9m). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 24, 2026). M4.3 Earthquake 53 km WSW of San Antonio, Chile — September 24, 2026. Retrieved September 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tx9m/