M3.5 Earthquake 58 km NNE of Luquillo, Puerto Rico — October 21, 2023
2023-10-21 17:03:17 UTC (2023-10-21) · approx. 1:03 PM UTC-4 local
On October 21, 2023 at 17:03 UTC, a magnitude 3.5 shallow crustal earthquake struck 58 km NNE of Luquillo, Puerto Rico, at a depth of 28.0 km and coordinates 18.8496°, -65.4738°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 154 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-65.4738°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Luquillo, Puerto Rico?
The magnitude 3.5 earthquake that struck 58 km NNE of Luquillo, Puerto Rico on October 21, 2023 at 17:03 UTC had a depth of 28.0 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2023294000). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 21, 2023). M3.5 Earthquake 58 km NNE of Luquillo, Puerto Rico — October 21, 2023. Retrieved October 21, 2023 from https://www.earthquaketracker.org/earthquakes/event/pr2023294000/