Washington earthquakes

M1.8 earthquake 4 km E of Winlock, Washington

A magnitude 1.8 earthquake struck 4 km E of Winlock, Washington on Wed, Mar 20, 1985, 12:37 PM PST (20:37 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.5 8 km SE of Mineral, Washington. This one was a foreshock.

Winlock 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
1.8 (md), micro
Local time
UTC
1985-03-20 20:37:06 UTC
Depth
-0.9 km (-0.5 mi), shallow
Epicenter
46.485° N, 122.875° 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 1.7 km horizontally, 5.1 km in depth
Magnitude uncertainty
±0.19
Depth from
Operator assigned
Station coverage gap
139°
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.58 km SE of Mineral, Washington · 15154 days ago · 18 km deep · 61 km away
  2. 1.54 km SSW of Orting, Washington · 15153 days ago · 0 km deep · 81 km away
  3. 1.710 km SSE of Mineral, Washington · 15151 days ago · 16 km deep · 58 km away
  4. 1.810 km SSE of Mineral, Washington · 15151 days ago · 16 km deep · 58 km away
  5. 2.810 km SSE of Mineral, Washington · 15151 days ago · 15 km deep · 58 km away
  6. 1.510 km SSE of Mineral, Washington · 15151 days ago · 16 km deep · 58 km away
  7. 2.610 km SSE of Mineral, Washington · 15151 days ago · 16 km deep · 58 km away
  8. 2.417 km SSE of Carbonado, Washington · 15144 days ago · 13 km deep · 85 km away
  9. 2.18 km S of Morton, Washington · 15142 days ago · 3 km deep · 45 km away
  10. 1.81 km SE of Deer Island, Oregon · 15137 days ago · 24 km deep · 63 km away
  11. 2.124 km S of Morton, Washington · 15136 days ago · 7 km deep · 51 km away
  12. 1.638 km NNE of Amboy, Washington · 15133 days ago · -1 km deep · 61 km away
  13. 2.017 km SSE of Carbonado, Washington · 15126 days ago · 13 km deep · 86 km away
  14. 2.111 km WSW of Mineral, Washington · 15125 days ago · 18 km deep · 47 km away
  15. 2.52 km SW of Browns Point, Washington · 15124 days ago · 57 km deep · 95 km away
  16. 2.622 km S of Morton, Washington · 15120 days ago · 9 km deep · 50 km away
  17. 2.022 km S of Morton, Washington · 15120 days ago · 10 km deep · 50 km away
  18. 1.638 km NNE of Amboy, Washington · 15119 days ago · -1 km deep · 61 km away
  19. 2.438 km NNE of Amboy, Washington · 15118 days ago · -1 km deep · 62 km away
  20. 2.336 km NNE of Amboy, Washington · 15118 days ago · -1 km deep · 59 km away
  21. 2.88 km S of Central Park, Washington · 15118 days ago · 34 km deep · 76 km away
  22. 1.75 km WSW of Packwood, Washington · 15116 days ago · 12 km deep · 87 km away
  23. 1.738 km NNE of Amboy, Washington · 15116 days ago · -1 km deep · 61 km away
  24. 2.79 km WSW of Packwood, Washington · 15111 days ago · 9 km deep · 84 km away
  25. 1.814 km NNE of Ashford, Washington · 15110 days ago · 6 km deep · 84 km away
  26. 2.139 km NNE of Amboy, Washington · 15109 days ago · -1 km deep · 62 km away
  27. 1.523 km ENE of Ashford, Washington · 15107 days ago · 2 km deep · 94 km away
  28. 1.638 km NNE of Amboy, Washington · 15105 days ago · -1 km deep · 61 km away
  29. 1.522 km S of Morton, Washington · 15102 days ago · 11 km deep · 50 km away
  30. 1.838 km NNE of Amboy, Washington · 15101 days ago · -1 km deep · 61 km away
  31. 1.538 km NNE of Amboy, Washington · 15101 days ago · -1 km deep · 61 km away

Before

  1. 3.52 km ENE of Rosedale, Washington · 15163 days ago · 53 km deep · 97 km away
  2. 1.59 km E of Ashford, Washington · 15174 days ago · 5 km deep · 80 km away
  3. 1.819 km SSE of Mossyrock, Washington · 15175 days ago · 20 km deep · 40 km away
  4. 1.538 km NNE of Amboy, Washington · 15176 days ago · -1 km deep · 61 km away
  5. 1.622 km S of Morton, Washington · 15177 days ago · 15 km deep · 48 km away
  6. 1.56 km SSW of Morton, Washington · 15181 days ago · 20 km deep · 43 km away
  7. 1.538 km NNE of Amboy, Washington · 15186 days ago · -1 km deep · 61 km away
  8. 1.812 km SE of Mossyrock, Washington · 15187 days ago · 14 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10188918. Read Tue, Sep 22, 2026, 9:05 AM UTC.