M4.0 Earthquake 161 km SW of Lebu, Chile — August 6, 2021
2021-08-06 23:08:52 UTC (2021-08-06) · approx. 6:08 PM UTC-5 local
On August 6, 2021 at 23:08 UTC, a magnitude 4.0 shallow crustal earthquake struck 161 km SW of Lebu, Chile, at a depth of 21.7 km and coordinates -38.5189°, -75.0900°.
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
-75.0900°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Lebu, Chile?
The magnitude 4.0 earthquake that struck 161 km SW of Lebu, Chile on August 6, 2021 at 23:08 UTC had a depth of 21.7 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: us6000f31f). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 6, 2021). M4.0 Earthquake 161 km SW of Lebu, Chile — August 6, 2021. Retrieved October 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f31f/