Washington earthquakes

M3.0 earthquake 12 km WNW of Mattawa, Washington

A magnitude 3.0 earthquake struck 12 km WNW of Mattawa, Washington on Mon, Sep 30, 1985, 10:25 PM PDT (05:25 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.2 8 km NNW of Moses Lake North, Washington. This one was a foreshock.

Mattawa forecastMore in Washington

Map

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

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The earthquake

Magnitude
3.0 (md), minor
Local time
UTC
1985-10-01 05:25:21 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
46.796° N, 120.048° W
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 0.5 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
44°
Stations used
39

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 3.012 km WNW of Mattawa, Washington · 14966 days ago · 1 km deep · 1 km away
  2. 2.512 km WNW of Mattawa, Washington · 14966 days ago · 1 km deep · 0 km away
  3. 1.68 km NNE of Selah, Washington · 14959 days ago · 19 km deep · 35 km away
  4. 1.622 km NNE of Terrace Heights, Washington · 14952 days ago · 0 km deep · 18 km away
  5. 2.123 km NNE of Terrace Heights, Washington · 14952 days ago · 2 km deep · 18 km away
  6. 1.711 km S of Toppenish, Washington · 14951 days ago · -1 km deep · 62 km away
  7. 1.822 km NNE of Terrace Heights, Washington · 14946 days ago · 2 km deep · 20 km away
  8. 1.914 km SSW of Vantage, Washington · 14945 days ago · 0 km deep · 3 km away
  9. 1.912 km NW of Mattawa, Washington · 14945 days ago · 4 km deep · 1 km away
  10. 1.723 km NE of Terrace Heights, Washington · 14940 days ago · 3 km deep · 17 km away
  11. 2.515 km NNE of Richland, Washington · 14939 days ago · 1 km deep · 79 km away
  12. 2.814 km NNE of Richland, Washington · 14939 days ago · 2 km deep · 79 km away
  13. 3.28 km NNW of Moses Lake North, Washington · 14913 days ago · 20 km deep · 74 km away

Before

  1. 2.01 km SW of Quincy, Washington · 14969 days ago · 0 km deep · 50 km away
  2. 1.712 km WNW of Mattawa, Washington · 14972 days ago · 0 km deep · 0 km away
  3. 1.913 km WNW of Mattawa, Washington · 14972 days ago · 3 km deep · 1 km away
  4. 2.10 km E of Entiat, Washington · 14977 days ago · 0 km deep · 99 km away
  5. 2.213 km WNW of Mattawa, Washington · 14991 days ago · 0 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10197673 (also filed as usp0002kb9). Read Tue, Sep 22, 2026, 5:11 AM UTC.