Washington earthquakes

M2.3 earthquake 11 km SW of Concrete, Washington

A magnitude 2.3 earthquake struck 11 km SW of Concrete, Washington on Mon, Sep 3, 1973, 10:38 PM PDT (05:38 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.7 27 km E of Darrington, 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
2.3 (md), micro
Local time
UTC
1973-09-04 05:38:45 UTC
Depth
0.4 km (0.3 mi), shallow
Epicenter
48.453° N, 121.841° 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 3.4 km horizontally, 2.7 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
185°, poorly surrounded by stations
Stations used
7

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 10 in the 30 days before it.

After

  1. 3.727 km E of Darrington, Washington · 19376 days ago · 4 km deep · 52 km away
  2. 2.15 km ESE of Port Townsend, Washington · 19375 days ago · 59 km deep · 74 km away
  3. 2.44 km NW of Swede Heaven, Washington · 19375 days ago · -1 km deep · 16 km away
  4. 1.85 km ESE of Nooksack, Washington · 19370 days ago · 15 km deep · 58 km away
  5. 2.45 km ESE of Nooksack, Washington · 19369 days ago · 21 km deep · 59 km away
  6. 1.98 km NW of Friday Harbor, Washington · 19369 days ago · 6 km deep · 93 km away
  7. 1.86 km NW of Friday Harbor, Washington · 19368 days ago · 5 km deep · 91 km away
  8. 1.55 km N of Marrowstone, Washington · 19366 days ago · 24 km deep · 73 km away
  9. 2.41 km NE of Shoreline, Washington · 19364 days ago · 23 km deep · 84 km away
  10. 2.34 km SW of Geneva, Washington · 19364 days ago · 24 km deep · 53 km away
  11. 2.29 km ENE of Snoqualmie, Washington · 19358 days ago · 81 km deep · 99 km away
  12. 2.22 km N of Seattle, Washington · 19352 days ago · -1 km deep · 99 km away
  13. 1.55 km SSW of Woodway, Washington · 19351 days ago · 16 km deep · 89 km away
  14. 1.67 km NNE of Port Ludlow, Washington · 19351 days ago · 4 km deep · 79 km away
  15. 1.61 km NNW of Hansville, Washington · 19349 days ago · 20 km deep · 79 km away
  16. 2.84 km N of Hansville, Washington · 19345 days ago · 23 km deep · 76 km away
  17. 1.72 km W of Medina, Washington · 19345 days ago · 0 km deep · 98 km away
  18. 1.61 km ENE of Indianola, Washington · 19345 days ago · 13 km deep · 93 km away
  19. 1.91 km NNW of Seattle, Washington · 19343 days ago · -1 km deep · 100 km away
  20. 1.9Puget Sound region, Washington · 19343 days ago · 1 km deep · 98 km away
  21. 2.43 km W of Medina, Washington · 19342 days ago · 2 km deep · 98 km away
  22. 2.52 km W of Medina, Washington · 19342 days ago · -1 km deep · 98 km away
  23. 1.71 km W of Medina, Washington · 19342 days ago · -1 km deep · 97 km away
  24. 1.82 km WNW of Medina, Washington · 19342 days ago · -1 km deep · 97 km away
  25. 1.80 km WNW of Medina, Washington · 19342 days ago · -1 km deep · 97 km away
  26. 1.64 km W of Medina, Washington · 19342 days ago · 0 km deep · 98 km away
  27. 2.82 km W of Medina, Washington · 19342 days ago · 4 km deep · 98 km away
  28. 1.66 km SW of Woodway, Washington · 19340 days ago · 21 km deep · 89 km away
  29. 2.81 km ENE of Seattle, Washington · 19338 days ago · 2 km deep · 100 km away
  30. 1.64 km S of Lake Cavanaugh, Washington · 19336 days ago · 13 km deep · 22 km away
  31. 1.814 km E of Carnation, Washington · 19318 days ago · 8 km deep · 88 km away

Before

  1. 1.83 km NNE of Seattle, Washington · 19378 days ago · -1 km deep · 97 km away
  2. 2.012 km SE of Hamilton, Washington · 19378 days ago · -1 km deep · 4 km away
  3. 1.53 km NNW of Seattle, Washington · 19379 days ago · 0 km deep · 99 km away
  4. 1.53 km W of Hunts Point, Washington · 19380 days ago · 2 km deep · 96 km away
  5. 1.61 km ESE of Clyde Hill, Washington · 19381 days ago · 25 km deep · 96 km away
  6. 1.81 km ENE of Silver Firs, Washington · 19385 days ago · 23 km deep · 68 km away
  7. 1.70 km E of Mill Creek East, Washington · 19386 days ago · 16 km deep · 73 km away
  8. 1.90 km NW of Edmonds, Washington · 19392 days ago · 23 km deep · 82 km away
  9. 2.71 km NNE of Woods Creek, Washington · 19399 days ago · 12 km deep · 63 km away
  10. 1.511 km S of Darrington, Washington · 19404 days ago · 1 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10856908. Read Tue, Sep 22, 2026, 9:35 AM UTC.