Washington earthquakes

M1.9 earthquake 6 km NW of Concrete, Washington

A magnitude 1.9 earthquake struck 6 km NW of Concrete, Washington on Tue, Dec 11, 1984, 3:15 AM PST (11:15 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.9 7 km NW of Concrete, 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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1984-12-11 11:15:25 UTC
Depth
0.9 km (0.6 mi), shallow
Epicenter
48.584° N, 121.809° 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 7.7 km horizontally, 79.4 km in depth
Magnitude uncertainty
±0.09
Depth from
Operator assigned
Station coverage gap
152°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.65 km NNW of Concrete, Washington · 15266 days ago · 3 km deep · 2 km away
  2. 2.043 km WNW of Winthrop, Washington · 15263 days ago · -1 km deep · 84 km away
  3. 1.66 km NNW of Concrete, Washington · 15263 days ago · 4 km deep · 1 km away
  4. 1.75 km N of Hamilton, Washington · 15263 days ago · 13 km deep · 13 km away
  5. 2.20 km N of Woodway, Washington · 15262 days ago · 22 km deep · 97 km away
  6. 2.97 km NW of Concrete, Washington · 15258 days ago · 2 km deep · 1 km away
  7. 1.74 km NNW of Bryant, Washington · 15257 days ago · 12 km deep · 44 km away
  8. 2.17 km NW of Concrete, Washington · 15251 days ago · 1 km deep · 0 km away
  9. 1.97 km NW of Concrete, Washington · 15249 days ago · 1 km deep · 0 km away
  10. 2.58 km NNE of Lake Marcel-Stillwater, Washington · 15241 days ago · 0 km deep · 92 km away
  11. 2.48 km NNE of Lake Marcel-Stillwater, Washington · 15239 days ago · 1 km deep · 92 km away
  12. 1.76 km WNW of Orcas, Washington · 15231 days ago · 19 km deep · 90 km away
  13. 2.53 km E of Edison, Washington · 15231 days ago · 14 km deep · 43 km away
  14. 1.65 km E of Lake Bosworth, Washington · 15226 days ago · -1 km deep · 59 km away
  15. 2.34 km E of Edison, Washington · 15224 days ago · 14 km deep · 42 km away
  16. 1.75 km ENE of Big Lake, Washington · 15224 days ago · 8 km deep · 32 km away
  17. 1.93 km E of Granite Falls, Washington · 15224 days ago · -1 km deep · 56 km away
  18. 1.55 km S of Lake Roesiger, Washington · 15218 days ago · -1 km deep · 73 km away
  19. 1.78 km ENE of Ferndale, Washington · 15218 days ago · 12 km deep · 58 km away
  20. 1.60 km WNW of Everett, Washington · 15218 days ago · 18 km deep · 73 km away
  21. 1.76 km WSW of Lake Cavanaugh, Washington · 15217 days ago · 12 km deep · 37 km away
  22. 1.96 km WSW of Lake Cavanaugh, Washington · 15217 days ago · 12 km deep · 38 km away

Before

  1. 3.27 km NW of Concrete, Washington · 15278 days ago · -1 km deep · 0 km away
  2. 3.17 km NW of Concrete, Washington · 15280 days ago · -1 km deep · 1 km away
  3. 1.59 km NW of Orcas, Washington · 15290 days ago · 20 km deep · 89 km away
  4. 2.31 km ENE of Hamilton, Washington · 15292 days ago · -1 km deep · 14 km away
  5. 2.01 km N of Woods Creek, Washington · 15292 days ago · 16 km deep · 77 km away
  6. 1.73 km NE of Woods Creek, Washington · 15295 days ago · -1 km deep · 76 km away
  7. 2.74 km NNW of Bryant, Washington · 15295 days ago · 14 km deep · 44 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10182108. Read Sat, Oct 3, 2026, 5:27 AM UTC.