M3.3 Earthquake 107 km N of San Juan, Puerto Rico — April 21, 2026
2026-04-21 18:02:39 UTC (4 hours ago)
On April 21, 2026 at 18:02 UTC, a magnitude 3.3 shallow crustal earthquake struck 107 km N of San Juan, Puerto Rico, at a depth of 29.6 km and coordinates 19.4312°, -66.0048°.
Earthquake Details
-66.0048°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near San Juan, Puerto Rico?
The magnitude 3.3 earthquake that struck 107 km N of San Juan, Puerto Rico on April 21, 2026 at 18:02 UTC had a depth of 29.6 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.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.