M3.1 Earthquake 55 km W of Puerto Real, Puerto Rico — November 28, 2021
2021-11-28 18:55:09 UTC (2021-11-28) · approx. 1:55 PM UTC-5 local
On November 28, 2021 at 18:55 UTC, a magnitude 3.1 shallow crustal earthquake struck 55 km W of Puerto Real, Puerto Rico, at a depth of 5.0 km and coordinates 18.0323°, -67.7085°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 722 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 86 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.7085°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Puerto Real, Puerto Rico?
The magnitude 3.1 earthquake that struck 55 km W of Puerto Real, Puerto Rico on November 28, 2021 at 18:55 UTC had a depth of 5.0 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021332018). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 28, 2021). M3.1 Earthquake 55 km W of Puerto Real, Puerto Rico — November 28, 2021. Retrieved November 28, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021332018/