Washington earthquakes

M1.9 earthquake 12 km NW of Mattawa, Washington

A magnitude 1.9 earthquake struck 12 km NW of Mattawa, Washington on Mon, Oct 21, 1985, 7:12 PM PDT (02:12 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M2.5 15 km NNE of Richland, 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
1.9 (md), micro
Local time
UTC
1985-10-22 02:12:48 UTC
Depth
3.6 km (2.3 mi), shallow
Epicenter
46.803° N, 120.032° 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 0.2 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
61°
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: 11 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 1.723 km NE of Terrace Heights, Washington · 14940 days ago · 3 km deep · 18 km away
  2. 2.515 km NNE of Richland, Washington · 14940 days ago · 1 km deep · 78 km away
  3. 2.814 km NNE of Richland, Washington · 14940 days ago · 2 km deep · 78 km away
  4. 3.28 km NNW of Moses Lake North, Washington · 14914 days ago · 20 km deep · 73 km away
  5. 1.623 km SSE of Kittitas, Washington · 14904 days ago · 1 km deep · 20 km away
  6. 1.78 km W of Entiat, Washington · 14904 days ago · 4 km deep · 99 km away
  7. 1.823 km SSE of Kittitas, Washington · 14903 days ago · 2 km deep · 20 km away
  8. 2.913 km ESE of Prosser, Washington · 14903 days ago · 1 km deep · 78 km away
  9. 2.64 km NE of Royal City, Washington · 14903 days ago · 0 km deep · 37 km away
  10. 2.310 km ESE of Royal City, Washington · 14899 days ago · 0 km deep · 40 km away
  11. 1.910 km WSW of Tieton, Washington · 14887 days ago · 5 km deep · 67 km away

Before

  1. 1.914 km SSW of Vantage, Washington · 14945 days ago · 0 km deep · 3 km away
  2. 1.822 km NNE of Terrace Heights, Washington · 14946 days ago · 2 km deep · 21 km away
  3. 1.711 km S of Toppenish, Washington · 14952 days ago · -1 km deep · 63 km away
  4. 2.123 km NNE of Terrace Heights, Washington · 14952 days ago · 2 km deep · 20 km away
  5. 1.622 km NNE of Terrace Heights, Washington · 14952 days ago · 0 km deep · 20 km away
  6. 1.68 km NNE of Selah, Washington · 14959 days ago · 19 km deep · 36 km away
  7. 2.512 km WNW of Mattawa, Washington · 14966 days ago · 1 km deep · 1 km away
  8. 3.012 km WNW of Mattawa, Washington · 14966 days ago · 1 km deep · 2 km away
  9. 3.012 km WNW of Mattawa, Washington · 14966 days ago · 1 km deep · 1 km away
  10. 2.01 km SW of Quincy, Washington · 14970 days ago · 0 km deep · 49 km away
  11. 1.712 km WNW of Mattawa, Washington · 14972 days ago · 0 km deep · 1 km away
  12. 1.913 km WNW of Mattawa, Washington · 14972 days ago · 3 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10200918. Read Tue, Sep 22, 2026, 10:45 AM UTC.