M3.1 Earthquake 62 km NNW of San Antonio, Puerto Rico — July 9, 2026
2026-07-09 19:06:22 UTC (1 hour ago) · approx. 3:06 PM UTC-4 local
On July 9, 2026 at 19:06 UTC, a magnitude 3.1 shallow crustal earthquake struck 62 km NNW of San Antonio, Puerto Rico, at a depth of 21.8 km and coordinates 18.9820°, -67.3845°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.3845°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 62 km NNW of San Antonio, Puerto Rico on July 9, 2026 at 19:06 UTC had a depth of 21.8 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 3.1 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.
Actions
Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71523198). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 9, 2026). M3.1 Earthquake 62 km NNW of San Antonio, Puerto Rico — July 9, 2026. Retrieved July 9, 2026 from https://www.earthquaketracker.org/earthquakes/event/pr71523198/