Washington earthquakes

M1.5 earthquake 10 km W of Cascade Valley, Washington

A magnitude 1.5 earthquake struck 10 km W of Cascade Valley, Washington on Wed, May 28, 1975, 3:57 PM PDT (22:57 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M1.6 15 km NNE of West Richland, Washington. This one was a foreshock.

Cascade 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), micro
Local time: Wed, May 28, 1975, 3:57 PM PDT
UTC: 1975-05-28 22:57:32 UTC
Depth: 19.6 km (12.2 mi), shallow
Epicenter: 47.118° N, 119.470° 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 5.7 km horizontally, 2.8 km in depth
Magnitude uncertainty: ±0.23
Depth from: From location
Station coverage gap: 315°, poorly surrounded by stations
Stations used: 5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 21 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 uw10862648. Read Tue, Sep 22, 2026, 7:00 AM UTC.