Washington earthquakes

M4.0 earthquake 3 km ENE of Deming, Washington

A magnitude 4.0 earthquake struck 3 km ENE of Deming, Washington on Mon, Apr 2, 1990, 7:18 PM PDT (02:18 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M5.0 4 km ENE of Deming, Washington. This one was a foreshock.

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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: 4.0 (Md, duration), light
Magnitude from: Pacific Northwest Seismic Network
Local time: Mon, Apr 2, 1990, 7:18 PM PDT
UTC: 1990-04-03 02:18:20 UTC
Depth: 0.9 km (0.6 mi), shallow
Epicenter: 48.836° N, 122.175° 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
4.0	Md, duration	Pacific Northwest Seismic Network	Preferred · Final · ±0.1 · 30 stations
4.1	mb, body-wave	USGS National Earthquake Information Center	Reviewed · 1 stations

What happened

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

Felt (V) at Deming and Nooksack; (IV) at Blaine, Bow, Lyman, Lynden and Mount Vernon; (III) Acme, Bellingham, Custer, Everson, Glacier, Maple Falls, Sedro Woolley and Sumas.

From the USGS event page for uw10253563. 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 2.2 km horizontally, 4.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 91°
Stations used: 30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 96 in the 60 days after this one and 28 in the 30 days before it.

After

The first 60 of 96.

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10253563 (also filed as usp00047db). Read Fri, Oct 2, 2026, 11:23 AM UTC.