Washington earthquakes

M1.5 earthquake 0 km ENE of Sudden Valley, Washington

A magnitude 1.5 earthquake struck 0 km ENE of Sudden Valley, Washington on Sun, Mar 18, 1990, 5:58 PM PST (01:58 UTC), 16 km (10 mi) below the surface.

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

Sudden Valley forecast More in Washington

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 1.5 (Md, duration), micro
Magnitude from: Pacific Northwest Seismic Network
Local time: Sun, Mar 18, 1990, 5:58 PM PST
UTC: 1990-03-19 01:58:54 UTC
Depth: 16.5 km (10.2 mi), shallow
Epicenter: 48.724° N, 122.341° 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 0.1 km horizontally, 0.2 km in depth
Magnitude uncertainty: ±0.08
Depth from: Operator assigned
Station coverage gap: 51°
Stations used: 16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 21 in the 30 days before it.

After

The first 60 of 107.

Before

Earthquakes today Washington earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10256463. Read Fri, Oct 2, 2026, 1:49 AM UTC.