M3.5 Earthquake 9 km NNW of San Juan, Puerto Rico — July 3, 2025
2025-07-03 22:09:42 UTC (2025-07-03) · approx. 6:09 PM UTC-4 local
On July 3, 2025 at 22:09 UTC, a magnitude 3.5 intermediate depth earthquake struck 9 km NNW of San Juan, Puerto Rico, at a depth of 96.0 km and coordinates 18.5443°, -66.1428°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.8 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 159 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.1428°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near San Juan, Puerto Rico?
The magnitude 3.5 earthquake that struck 9 km NNW of San Juan, Puerto Rico on July 3, 2025 at 22:09 UTC had a depth of 96.0 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: pr2025184002). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 3, 2025). M3.5 Earthquake 9 km NNW of San Juan, Puerto Rico — July 3, 2025. Retrieved September 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/pr2025184002/