Washington earthquakes

M2.4 earthquake Washington-Oregon border region

A magnitude 2.4 earthquake struck in the Washington-Oregon border region on Mon, Sep 20, 2004, 2:51 AM PDT (09:51 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M3.9 37 km NNE of Amboy, Washington. This one was a foreshock.

Hockinson forecast More in Washington

Map

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

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The earthquake

Magnitude: 2.4 (Md, duration), micro
Magnitude from: Pacific Northwest Seismic Network
Local time: Mon, Sep 20, 2004, 2:51 AM PDT
UTC: 2004-09-20 09:51:00 UTC
Depth: 14.9 km (9.3 mi), shallow
Epicenter: 45.719° N, 122.498° W
Region: Washington
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.4 km horizontally, 0.8 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 62°
Stations used: 40

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and 3 in the 30 days before it.

After

The first 60 of at least 202.

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10623733. Read Sat, Oct 3, 2026, 9:20 AM UTC.