M4.3 Earthquake 84 km W of San Antonio, Chile — September 30, 2023
2023-09-30 17:44:06 UTC (2023-09-30) · approx. 12:44 PM UTC-5 local
On September 30, 2023 at 17:44 UTC, a magnitude 4.3 shallow crustal earthquake struck 84 km W of San Antonio, Chile, at a depth of 7.4 km and coordinates -33.7076°, -72.5135°.
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.
Earthquake Details
-72.5135°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 84 km W of San Antonio, Chile on September 30, 2023 at 17:44 UTC had a depth of 7.4 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.
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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: us6000lbxz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 30, 2023). M4.3 Earthquake 84 km W of San Antonio, Chile — September 30, 2023. Retrieved December 9, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000lbxz/