3 km SW of Guánica, Puerto Rico

2 hours ago

USGS

A magnitude 4.6 earthquake struck 3 km SW of Guánica, Puerto Rico on 18 Sept 2026, 13:19 UTC. The hypocentre was 10 km below the surface — shallow by seismological convention. The figures have been revised 2 times since the first report. 5 other earthquakes above our reporting threshold have been recorded within 250 km in the past 30 days.

Depth: 10 km
Latitude: 17.95°N
Time: 13:19 UTC
Magnitude: M4.6

EPICENTRE

View the official report↗

MAGNITUDE 4.6

Noticeable shaking of indoor objects. Damage is unlikely.

The scale is logarithmic: this released about 250 times the energy of a magnitude 3.0, roughly the energy of 120 tonnes of TNT.

10 KM DEEP

Shallow earthquakes release their energy close to the surface, so they are felt more strongly, and do more damage, than deeper earthquakes of the same magnitude.