M4.0 Earthquake 119 km W of La Libertad, Mexico — December 4, 2021
2021-12-04 23:51:17 UTC (2021-12-04) · approx. 3:51 PM UTC-8 local
On December 4, 2021 at 23:51 UTC, a magnitude 4.0 shallow crustal earthquake struck 119 km W of La Libertad, Mexico, at a depth of 10.0 km and coordinates 29.8072°, -113.9213°.
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
-113.9213°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near La Libertad, Mexico?
The magnitude 4.0 earthquake that struck 119 km W of La Libertad, Mexico on December 4, 2021 at 23:51 UTC had a depth of 10.0 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: us6000g945). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 4, 2021). M4.0 Earthquake 119 km W of La Libertad, Mexico — December 4, 2021. Retrieved February 12, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000g945/