M3.9 Earthquake 98 km N of Brenas, Puerto Rico — December 3, 2023
2023-12-03 23:43:42 UTC (2023-12-03) · approx. 7:43 PM UTC-4 local
On December 3, 2023 at 23:43 UTC, a magnitude 3.9 intermediate depth earthquake struck 98 km N of Brenas, Puerto Rico, at a depth of 94.0 km and coordinates 19.3516°, -66.2730°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 301 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.2730°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Brenas, Puerto Rico?
The magnitude 3.9 earthquake that struck 98 km N of Brenas, Puerto Rico on December 3, 2023 at 23:43 UTC had a depth of 94.0 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: pr2023337002). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, December 3, 2023). M3.9 Earthquake 98 km N of Brenas, Puerto Rico — December 3, 2023. Retrieved February 10, 2024 from https://www.earthquaketracker.org/earthquakes/event/pr2023337002/