M3.9 Earthquake 154 km WSW of Illapel, Chile — July 22, 2023
2023-07-22 21:04:43 UTC (2023-07-22) · approx. 4:04 PM UTC-5 local
On July 22, 2023 at 21:04 UTC, a magnitude 3.9 shallow crustal earthquake struck 154 km WSW of Illapel, Chile, at a depth of 10.0 km and coordinates -31.9318°, -72.7639°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-72.7639°E
Technical Information
Common Questions
How strong was the magnitude 3.9 earthquake near Illapel, Chile?
The magnitude 3.9 earthquake that struck 154 km WSW of Illapel, Chile on July 22, 2023 at 21:04 UTC had a depth of 10.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000khp7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 22, 2023). M3.9 Earthquake 154 km WSW of Illapel, Chile — July 22, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000khp7/