M4.0 Earthquake 22 km S of Nueve de Julio, Argentina — December 8, 2021
2021-12-08 23:36:02 UTC (2021-12-08) · approx. 6:36 PM UTC-5 local
On December 8, 2021 at 23:36 UTC, a magnitude 4.0 intermediate depth earthquake struck 22 km S of Nueve de Julio, Argentina, at a depth of 112.1 km and coordinates -31.8741°, -68.3598°.
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
-68.3598°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Nueve de Julio, Argentina?
The magnitude 4.0 earthquake that struck 22 km S of Nueve de Julio, Argentina on December 8, 2021 at 23:36 UTC had a depth of 112.1 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: us6000gap7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 8, 2021). M4.0 Earthquake 22 km S of Nueve de Julio, Argentina — December 8, 2021. Retrieved February 12, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gap7/