M4.0 Earthquake 71 km WNW of La Ligua, Chile — September 23, 2023
2023-09-23 18:52:31 UTC (2023-09-23) · approx. 1:52 PM UTC-5 local
On September 23, 2023 at 18:52 UTC, a magnitude 4.0 shallow crustal earthquake struck 71 km WNW of La Ligua, Chile, at a depth of 34.9 km and coordinates -32.1361°, -71.8904°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-71.8904°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near La Ligua, Chile?
The magnitude 4.0 earthquake that struck 71 km WNW of La Ligua, Chile on September 23, 2023 at 18:52 UTC had a depth of 34.9 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000kxp9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 23, 2023). M4.0 Earthquake 71 km WNW of La Ligua, Chile — September 23, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kxp9/