M2.3 earthquake 9 km N of Hamilton, Washington

A magnitude 2.3 earthquake struck 9 km N of Hamilton, Washington on Fri, Sep 13, 2002, 7:59 AM PDT (14:59 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M4.1 9 km SW of Friday Harbor, Washington. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.3	Md, duration	Pacific Northwest Seismic Network	Preferred · Final · ±0.04 · 13 stations
2.4	Md, duration	USGS National Earthquake Information Center	Reviewed

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 28 in the 60 days after this one and 5 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uw10563018 (also filed as usp000bc5d). Read Thu, Oct 1, 2026, 10:31 AM UTC.