M3.9 Earthquake 123 km N of Suárez, Puerto Rico — December 4, 2023
2023-12-04 23:58:40 UTC (2023-12-04) · approx. 7:58 PM UTC-4 local
On December 4, 2023 at 23:58 UTC, a magnitude 3.9 shallow crustal earthquake struck 123 km N of Suárez, Puerto Rico, at a depth of 11.0 km and coordinates 19.5445°, -65.7593°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 10 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 291 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-65.7593°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Suárez, Puerto Rico?
The magnitude 3.9 earthquake that struck 123 km N of Suárez, Puerto Rico on December 4, 2023 at 23:58 UTC had a depth of 11.0 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2023338001). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, December 4, 2023). M3.9 Earthquake 123 km N of Suárez, Puerto Rico — December 4, 2023. Retrieved February 10, 2024 from https://www.earthquaketracker.org/earthquakes/event/pr2023338001/