M3.3 Earthquake 72 km N of Brenas, Puerto Rico — November 25, 2021
2021-11-25 17:34:15 UTC (2021-11-25) · approx. 1:34 PM UTC-4 local
On November 25, 2021 at 17:34 UTC, a magnitude 3.3 shallow crustal earthquake struck 72 km N of Brenas, Puerto Rico, at a depth of 29.0 km and coordinates 19.1171°, -66.4108°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.5 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 122 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.4108°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Brenas, Puerto Rico?
The magnitude 3.3 earthquake that struck 72 km N of Brenas, Puerto Rico on November 25, 2021 at 17:34 UTC had a depth of 29.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021329011). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 25, 2021). M3.3 Earthquake 72 km N of Brenas, Puerto Rico — November 25, 2021. Retrieved January 29, 2022 from https://www.earthquaketracker.org/earthquakes/event/pr2021329011/