Washington earthquakes

M2.5 earthquake 12 km WNW of Mattawa, Washington

A magnitude 2.5 earthquake struck 12 km WNW of Mattawa, Washington on Mon, Sep 30, 1985, 11:54 PM PDT (06:54 UTC), 1 km (1 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
2.5 (md), micro
Local time
UTC
1985-10-01 06:54:09 UTC
Depth
1.0 km (0.6 mi), shallow
Epicenter
46.797° N, 120.045° 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 0.8 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.10
Depth from
Operator assigned
Station coverage gap
44°
Stations used
35

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.68 km NNE of Selah, Washington · 14967 days ago · 19 km deep · 35 km away
  2. 1.622 km NNE of Terrace Heights, Washington · 14960 days ago · 0 km deep · 19 km away
  3. 2.123 km NNE of Terrace Heights, Washington · 14960 days ago · 2 km deep · 19 km away
  4. 1.711 km S of Toppenish, Washington · 14960 days ago · -1 km deep · 62 km away
  5. 1.822 km NNE of Terrace Heights, Washington · 14954 days ago · 2 km deep · 20 km away
  6. 1.914 km SSW of Vantage, Washington · 14954 days ago · 0 km deep · 3 km away
  7. 1.912 km NW of Mattawa, Washington · 14954 days ago · 4 km deep · 1 km away
  8. 1.723 km NE of Terrace Heights, Washington · 14948 days ago · 3 km deep · 17 km away
  9. 2.515 km NNE of Richland, Washington · 14948 days ago · 1 km deep · 79 km away
  10. 2.814 km NNE of Richland, Washington · 14948 days ago · 2 km deep · 79 km away
  11. 3.28 km NNW of Moses Lake North, Washington · 14922 days ago · 20 km deep · 74 km away

Before

  1. 3.012 km WNW of Mattawa, Washington · 14974 days ago · 1 km deep · 1 km away
  2. 3.012 km WNW of Mattawa, Washington · 14974 days ago · 1 km deep · 0 km away
  3. 2.01 km SW of Quincy, Washington · 14978 days ago · 0 km deep · 50 km away
  4. 1.712 km WNW of Mattawa, Washington · 14980 days ago · 0 km deep · 0 km away
  5. 1.913 km WNW of Mattawa, Washington · 14981 days ago · 3 km deep · 1 km away
  6. 2.10 km E of Entiat, Washington · 14985 days ago · 0 km deep · 98 km away
  7. 2.213 km WNW of Mattawa, Washington · 15000 days ago · 0 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10197743. Read Wed, Sep 30, 2026, 3:32 PM UTC.