M3.3 Earthquake 86 km NNW of San Antonio, Puerto Rico — May 21, 2025
2025-05-21 21:42:48 UTC (2025-05-21) · approx. 4:42 PM UTC-5 local
On May 21, 2025 at 21:42 UTC, a magnitude 3.3 shallow crustal earthquake struck 86 km NNW of San Antonio, Puerto Rico, at a depth of 48.8 km and coordinates 19.1677°, -67.5125°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.5125°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near San Antonio, Puerto Rico?
The magnitude 3.3 earthquake that struck 86 km NNW of San Antonio, Puerto Rico on May 21, 2025 at 21:42 UTC had a depth of 48.8 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 3.3 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71483128). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, May 21, 2025). M3.3 Earthquake 86 km NNW of San Antonio, Puerto Rico — May 21, 2025. Retrieved May 21, 2025 from https://www.earthquaketracker.org/earthquakes/event/pr71483128/