M3.1 Earthquake 72 km NW of San Antonio, Puerto Rico — December 21, 2024
2024-12-21 17:29:02 UTC (2024-12-21) · approx. 12:29 PM UTC-5 local
On December 21, 2024 at 17:29 UTC, a magnitude 3.1 shallow crustal earthquake struck 72 km NW of San Antonio, Puerto Rico, at a depth of 10.4 km and coordinates 18.9962°, -67.5355°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 697 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 84 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.5355°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near San Antonio, Puerto Rico?
The magnitude 3.1 earthquake that struck 72 km NW of San Antonio, Puerto Rico on December 21, 2024 at 17:29 UTC had a depth of 10.4 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.
Actions
Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71469043). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, December 21, 2024). M3.1 Earthquake 72 km NW of San Antonio, Puerto Rico — December 21, 2024. Retrieved December 21, 2024 from https://www.earthquaketracker.org/earthquakes/event/pr71469043/