Washington earthquakes

M1.9 earthquake 6 km SSE of Concrete, Washington

A magnitude 1.9 earthquake struck 6 km SSE of Concrete, Washington on Sat, Apr 28, 1984, 10:21 PM PST (06:21 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.0 5 km ENE of Anacortes, Washington. This one was a foreshock.

Concrete 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
1.9 (md), micro
Local time
UTC
1984-04-29 06:21:57 UTC
Depth
2.7 km (1.7 mi), shallow
Epicenter
48.485° N, 121.704° 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 4.0 km horizontally, 15.6 km in depth
Magnitude uncertainty
±0.14
Depth from
Operator assigned
Station coverage gap
202°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 1.66 km NW of Burlington, Washington · 15485 days ago · 18 km deep · 51 km away
  2. 1.710 km SSW of Darrington, Washington · 15484 days ago · 18 km deep · 36 km away
  3. 1.514 km ENE of Lake Marcel-Stillwater, Washington · 15481 days ago · 27 km deep · 84 km away
  4. 1.74 km E of Granite Falls, Washington · 15480 days ago · -1 km deep · 46 km away
  5. 2.05 km ENE of Anacortes, Washington · 15475 days ago · 17 km deep · 62 km away
  6. 2.14 km E of Machias, Washington · 15470 days ago · 7 km deep · 60 km away
  7. 1.74 km WNW of Orcas, Washington · 15467 days ago · 15 km deep · 97 km away
  8. 1.66 km SW of Baring, Washington · 15467 days ago · 5 km deep · 85 km away
  9. 2.116 km S of Glacier, Washington · 15464 days ago · -1 km deep · 33 km away
  10. 1.6Washington · 15464 days ago · -1 km deep · 34 km away
  11. 2.211 km NNE of Hamilton, Washington · 15456 days ago · 2 km deep · 23 km away
  12. 1.69 km N of Hamilton, Washington · 15456 days ago · -1 km deep · 25 km away
  13. 2.64 km NNW of Verlot, Washington · 15453 days ago · 14 km deep · 41 km away
  14. 1.61 km SSE of Friday Harbor, Washington · 15453 days ago · 49 km deep · 96 km away
  15. 2.05 km WNW of Sedro-Woolley, Washington · 15452 days ago · 13 km deep · 44 km away
  16. 1.65 km NW of Sedro-Woolley, Washington · 15452 days ago · 31 km deep · 43 km away
  17. 1.51 km ENE of West Lake Stevens, Washington · 15451 days ago · 58 km deep · 61 km away
  18. 1.72 km NNW of Alger, Washington · 15449 days ago · 12 km deep · 51 km away
  19. 1.85 km ESE of Carnation, Washington · 15448 days ago · 13 km deep · 95 km away
  20. 2.15 km N of Burlington, Washington · 15445 days ago · 15 km deep · 46 km away
  21. 1.64 km W of Lynden, Washington · 15444 days ago · 17 km deep · 79 km away
  22. 2.330 km WSW of Twisp, Washington · 15440 days ago · 6 km deep · 91 km away
  23. 2.66 km SE of Edison, Washington · 15440 days ago · 9 km deep · 51 km away
  24. 1.81 km WNW of Sammamish, Washington · 15438 days ago · 5 km deep · 98 km away
  25. 2.25 km ENE of Bay View, Washington · 15438 days ago · 14 km deep · 52 km away
  26. 2.36 km W of Rockport, Washington · 15438 days ago · 2 km deep · 2 km away
  27. 1.92 km SW of Redmond, Washington · 15435 days ago · 2 km deep · 97 km away
  28. 2.016 km W of Coupeville, Washington · 15433 days ago · 46 km deep · 93 km away
  29. 1.830 km ENE of Glacier, Washington · 15430 days ago · 4 km deep · 57 km away

Before

  1. 2.92 km S of Ames Lake, Washington · 15488 days ago · 9 km deep · 99 km away
  2. 1.73 km S of Alger, Washington · 15489 days ago · 18 km deep · 47 km away
  3. 2.09 km E of Orcas, Washington · 15492 days ago · 6 km deep · 83 km away
  4. 1.72 km SSW of Everett, Washington · 15495 days ago · 26 km deep · 69 km away
  5. 1.57 km NE of Verlot, Washington · 15498 days ago · -1 km deep · 39 km away
  6. 2.35 km NW of Orcas, Washington · 15504 days ago · 17 km deep · 96 km away
  7. 2.15 km SE of Monroe, Washington · 15508 days ago · 24 km deep · 77 km away
  8. 1.510 km S of Swede Heaven, Washington · 15509 days ago · 14 km deep · 33 km away
  9. 2.34 km WSW of Coupeville, Washington · 15515 days ago · 24 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10175933. Read Tue, Sep 22, 2026, 10:52 AM UTC.