Washington earthquakes

M3.1 earthquake 55 km WNW of Granite Falls, Washington

A magnitude 3.1 earthquake struck 55 km WNW of Granite Falls, Washington on Thu, Apr 25, 1991, 10:30 PM PDT (05:30 UTC), -1 km (0 mi) below the surface.

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Map

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

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The earthquake

Magnitude: 3.1 (Md, duration), minor
Magnitude from: Pacific Northwest Seismic Network
Local time: Thu, Apr 25, 1991, 10:30 PM PDT
UTC: 1991-04-26 05:30:37 UTC
Depth: -0.6 km (-0.4 mi), shallow
Epicenter: 48.106° N, 120.884° W
Region: Washington
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
3.1	Md, duration	Pacific Northwest Seismic Network	Preferred · Final · ±0.08 · 23 stations
3.1	Md, duration	USGS National Earthquake Information Center	Reviewed

What happened

The USGS’s account of the effects of this earthquake.

CL 3.1 (SEA).

From the USGS event page for uw10274798. U.S. Geological Survey text and figures are in the public domain.

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 1.2 km horizontally, 5.7 km in depth
Magnitude uncertainty: ±0.08
Depth from: Operator assigned
Station coverage gap: 76°
Stations used: 46

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 8 in the 30 days before it.

After

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10274798 (also filed as usp0004quf). Read Mon, Oct 5, 2026, 4:28 AM UTC.