Washington earthquakes

M1.8 earthquake 9 km SSE of Onalaska, Washington

A magnitude 1.8 earthquake struck 9 km SSE of Onalaska, Washington on Sun, Apr 8, 1984, 12:55 PM PST (20:55 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M2.0 38 km NNE of Amboy, Washington. This one was a foreshock.

Onalaska 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
1984-04-08 20:55:45 UTC
Depth
17.4 km (10.8 mi), shallow
Epicenter
46.497° N, 122.684° 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 0.4 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
79°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 167 in the 30 days before it.

After

  1. 2.038 km NNE of Amboy, Washington · 15507 days ago · 0 km deep · 50 km away
  2. 1.85 km SSE of Carbonado, Washington · 15507 days ago · 4 km deep · 78 km away
  3. 1.82 km E of Grapeview, Washington · 15500 days ago · 12 km deep · 93 km away
  4. 1.713 km N of Skamokawa Valley, Washington · 15491 days ago · 10 km deep · 53 km away
  5. 1.615 km E of Wilkeson, Washington · 15488 days ago · 6 km deep · 93 km away
  6. 1.88 km E of Ashford, Washington · 15485 days ago · 13 km deep · 65 km away
  7. 2.012 km S of Morton, Washington · 15480 days ago · 7 km deep · 33 km away
  8. 1.738 km NNE of Amboy, Washington · 15476 days ago · 0 km deep · 50 km away
  9. 1.78 km SE of Buckley, Washington · 15475 days ago · 1 km deep · 90 km away
  10. 1.738 km NNE of Amboy, Washington · 15475 days ago · -1 km deep · 50 km away
  11. 1.538 km NNE of Amboy, Washington · 15472 days ago · -2 km deep · 50 km away
  12. 2.037 km NNE of Amboy, Washington · 15471 days ago · -2 km deep · 50 km away
  13. 1.838 km NNE of Amboy, Washington · 15471 days ago · -1 km deep · 50 km away
  14. 1.5Washington · 15471 days ago · -1 km deep · 50 km away
  15. 2.314 km SE of Ashford, Washington · 15471 days ago · 7 km deep · 63 km away
  16. 1.538 km NNE of Amboy, Washington · 15470 days ago · -1 km deep · 48 km away
  17. 1.838 km NNE of Amboy, Washington · 15467 days ago · -1 km deep · 49 km away
  18. 1.710 km E of Eatonville, Washington · 15467 days ago · 5 km deep · 60 km away
  19. 1.711 km ENE of Prescott, Oregon · 15460 days ago · 19 km deep · 45 km away
  20. 1.613 km ESE of Yacolt, Washington · 15458 days ago · 11 km deep · 81 km away
  21. 3.75 km N of West Longview, Washington · 15451 days ago · 52 km deep · 40 km away
  22. 1.918 km NNE of Ashford, Washington · 15450 days ago · 6 km deep · 74 km away
  23. 1.916 km NE of Woodland, Washington · 15448 days ago · 16 km deep · 52 km away

Before

  1. 2.016 km SE of Carbonado, Washington · 15507 days ago · 7 km deep · 79 km away
  2. 3.312 km WSW of La Grande, Washington · 15508 days ago · 66 km deep · 37 km away
  3. 1.938 km NNE of Amboy, Washington · 15508 days ago · -1 km deep · 50 km away
  4. 1.93 km WNW of Wauna, Washington · 15511 days ago · 22 km deep · 99 km away
  5. 2.421 km S of Morton, Washington · 15512 days ago · 8 km deep · 37 km away
  6. 2.238 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  7. 2.238 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  8. 2.238 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  9. 1.738 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  10. 1.838 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  11. 1.838 km NNE of Amboy, Washington · 15515 days ago · -1 km deep · 50 km away
  12. 1.838 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  13. 2.238 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  14. 1.738 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  15. 1.638 km NNE of Amboy, Washington · 15515 days ago · -2 km deep · 50 km away
  16. 1.838 km NNE of Amboy, Washington · 15516 days ago · -2 km deep · 50 km away
  17. 2.038 km NNE of Amboy, Washington · 15516 days ago · -2 km deep · 50 km away
  18. 1.838 km NNE of Amboy, Washington · 15516 days ago · -2 km deep · 50 km away
  19. 2.037 km NNE of Amboy, Washington · 15516 days ago · -1 km deep · 50 km away
  20. 2.438 km NNE of Amboy, Washington · 15516 days ago · -2 km deep · 50 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10173278. Read Wed, Sep 23, 2026, 3:32 AM UTC.