M3.4 Earthquake 50 km N of Brenas, Puerto Rico — December 11, 2021
2021-12-11 21:08:39 UTC (2021-12-11) · approx. 5:08 PM UTC-4 local
On December 11, 2021 at 21:08 UTC, a magnitude 3.4 shallow crustal earthquake struck 50 km N of Brenas, Puerto Rico, at a depth of 46.0 km and coordinates 18.9173°, -66.2980°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.2980°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Brenas, Puerto Rico?
The magnitude 3.4 earthquake that struck 50 km N of Brenas, Puerto Rico on December 11, 2021 at 21:08 UTC had a depth of 46.0 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021345008). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 11, 2021). M3.4 Earthquake 50 km N of Brenas, Puerto Rico — December 11, 2021. Retrieved February 24, 2022 from https://www.earthquaketracker.org/earthquakes/event/pr2021345008/