M3.3 Earthquake 50 km N of Loíza, Puerto Rico — July 18, 2026
2026-07-18 09:49:21 UTC (1 hour ago) · approx. 5:49 AM UTC-4 local
On July 18, 2026 at 09:49 UTC, a magnitude 3.3 shallow crustal earthquake struck 50 km N of Loíza, Puerto Rico, at a depth of 40.1 km and coordinates 18.8870°, -65.8885°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.2 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 107 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-65.8885°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near Loíza, Puerto Rico?
The magnitude 3.3 earthquake that struck 50 km N of Loíza, Puerto Rico on July 18, 2026 at 09:49 UTC had a depth of 40.1 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: pr71524833). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 18, 2026). M3.3 Earthquake 50 km N of Loíza, Puerto Rico — July 18, 2026. Retrieved July 18, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71524833/