5 km WNW of Wauna, Washington

20 days ago

USGS

A magnitude 4.2 earthquake struck 5 km WNW of Wauna, Washington on 29 Sept 2026, 21:05 UTC. The hypocentre was 27.9 km below the surface — shallow by seismological convention. The figures have been revised 20 times since the first report. 1 other earthquake above our reporting threshold has been recorded within 250 km in the past 30 days.

Depth: 27.9 km
Latitude: 47.41°N
Time: 21:05 UTC
Magnitude: M4.2

EPICENTRE

View the official report↗

MAGNITUDE 4.2

Noticeable shaking of indoor objects. Damage is unlikely.

The scale is logarithmic: this released about 63 times the energy of a magnitude 3.0, roughly the energy of 30 tonnes of TNT.

27.9 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.