Washington earthquakes

M1.9 earthquake 4 km S of Union, Washington

A magnitude 1.9 earthquake struck 4 km S of Union, Washington on Wed, Mar 28, 1984, 7:54 AM PST (15:54 UTC), 42 km (26 mi) below the surface.

A larger quake followed: M2.2 4 km WNW of Fall City, 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
1984-03-28 15:54:14 UTC
Depth
42.2 km (26.2 mi), shallow
Epicenter
47.319° N, 123.092° 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 1.0 km horizontally, 1.4 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
72°
Stations used
19

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 17 in the 30 days before it.

After

  1. 1.82 km NW of Fall City, Washington · 15517 days ago · 2 km deep · 93 km away
  2. 2.24 km WNW of Fall City, Washington · 15517 days ago · 1 km deep · 92 km away
  3. 1.85 km W of Burley, Washington · 15517 days ago · 23 km deep · 31 km away
  4. 1.714 km SSW of Alder, Washington · 15517 days ago · 4 km deep · 88 km away
  5. 1.93 km WNW of Wauna, Washington · 15511 days ago · 22 km deep · 32 km away
  6. 1.54 km WSW of Erlands Point-Kitsap Lake, Washington · 15508 days ago · 11 km deep · 39 km away
  7. 3.312 km WSW of La Grande, Washington · 15507 days ago · 66 km deep · 75 km away
  8. 2.016 km SE of Carbonado, Washington · 15507 days ago · 7 km deep · 97 km away
  9. 1.89 km SSE of Onalaska, Washington · 15507 days ago · 17 km deep · 97 km away
  10. 1.85 km SSE of Carbonado, Washington · 15506 days ago · 4 km deep · 87 km away
  11. 1.72 km SW of Issaquah, Washington · 15504 days ago · 17 km deep · 81 km away
  12. 2.14 km WNW of Fall City, Washington · 15503 days ago · 1 km deep · 92 km away
  13. 1.93 km NW of Fall City, Washington · 15503 days ago · 1 km deep · 94 km away
  14. 1.82 km E of Grapeview, Washington · 15499 days ago · 12 km deep · 22 km away
  15. 1.60 km E of Medina, Washington · 15499 days ago · 24 km deep · 74 km away
  16. 1.72 km SSW of Everett, Washington · 15496 days ago · 26 km deep · 97 km away
  17. 2.92 km S of Ames Lake, Washington · 15488 days ago · 9 km deep · 91 km away
  18. 1.615 km E of Wilkeson, Washington · 15488 days ago · 6 km deep · 98 km away
  19. 1.711 km SSW of Seabeck, Washington · 15486 days ago · 7 km deep · 29 km away
  20. 2.37 km WNW of Gorst, Washington · 15484 days ago · 15 km deep · 35 km away
  21. 2.13 km NW of Fall City, Washington · 15483 days ago · 2 km deep · 93 km away
  22. 1.72 km NNW of Fall City, Washington · 15483 days ago · 4 km deep · 94 km away
  23. 1.94 km SSW of River Road, Washington · 15483 days ago · -1 km deep · 79 km away
  24. 2.15 km SSW of Fall City, Washington · 15481 days ago · 20 km deep · 92 km away
  25. 2.19 km NNW of Carlsborg, Washington · 15478 days ago · 40 km deep · 95 km away
  26. 1.78 km SE of Buckley, Washington · 15475 days ago · 1 km deep · 90 km away
  27. 1.9Puget Sound region, Washington · 15473 days ago · 16 km deep · 17 km away
  28. 1.710 km E of Eatonville, Washington · 15467 days ago · 5 km deep · 87 km away
  29. 1.81 km W of Hobart, Washington · 15466 days ago · 22 km deep · 84 km away
  30. 1.94 km NE of Vashon, Washington · 15466 days ago · 8 km deep · 53 km away
  31. 2.115 km W of Quilcene, Washington · 15463 days ago · 46 km deep · 58 km away

Before

  1. 2.91 km WNW of Keyport, Washington · 15523 days ago · 18 km deep · 55 km away
  2. 1.93 km W of Blyn, Washington · 15524 days ago · -1 km deep · 78 km away
  3. 1.51 km E of Clyde Hill, Washington · 15524 days ago · 24 km deep · 76 km away
  4. 1.722 km W of Brinnon, Washington · 15525 days ago · 45 km deep · 41 km away
  5. 2.01 km W of Wilkeson, Washington · 15525 days ago · 5 km deep · 81 km away
  6. 1.91 km ESE of Clyde Hill, Washington · 15527 days ago · 23 km deep · 75 km away
  7. 1.52 km SW of Chico, Washington · 15529 days ago · 12 km deep · 41 km away
  8. 1.68 km E of Wilkeson, Washington · 15532 days ago · 9 km deep · 91 km away
  9. 2.71 km SW of Mountlake Terrace, Washington · 15532 days ago · 22 km deep · 77 km away
  10. 2.12 km ENE of Burley, Washington · 15538 days ago · 15 km deep · 39 km away
  11. 2.15 km W of Burley, Washington · 15538 days ago · 22 km deep · 31 km away
  12. 1.56 km WNW of Tumwater, Washington · 15541 days ago · -1 km deep · 34 km away
  13. 2.48 km WNW of Picnic Point, Washington · 15543 days ago · 14 km deep · 83 km away
  14. 2.34 km NNW of Kingston, Washington · 15543 days ago · 19 km deep · 72 km away
  15. 1.63 km W of Fall City, Washington · 15544 days ago · 16 km deep · 91 km away
  16. 1.913 km S of Montesano, Washington · 15547 days ago · 36 km deep · 65 km away
  17. 1.93 km SSW of Quilcene, Washington · 15548 days ago · -1 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10179668. Read Tue, Sep 22, 2026, 3:09 PM UTC.