M4.0 Earthquake 91 km SSW of Antofagasta, Chile — March 15, 2023
2023-03-15 21:35:21 UTC (2023-03-15) · approx. 4:35 PM UTC-5 local
On March 15, 2023 at 21:35 UTC, a magnitude 4.0 shallow crustal earthquake struck 91 km SSW of Antofagasta, Chile, at a depth of 32.3 km and coordinates -24.3668°, -70.8414°.
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
-70.8414°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Antofagasta, Chile?
The magnitude 4.0 earthquake that struck 91 km SSW of Antofagasta, Chile on March 15, 2023 at 21:35 UTC had a depth of 32.3 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: us7000jk9s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 15, 2023). M4.0 Earthquake 91 km SSW of Antofagasta, Chile — March 15, 2023. Retrieved May 20, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jk9s/