Washington earthquakes

M2.1 earthquake 7 km NW of Concrete, Washington

A magnitude 2.1 earthquake struck 7 km NW of Concrete, Washington on Mon, Dec 31, 1984, 6:44 AM PST (14:44 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.5 8 km NNE of Lake Marcel-Stillwater, 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
2.1 (md), micro
Local time
UTC
1984-12-31 14:44:34 UTC
Depth
1.0 km (0.6 mi), shallow
Epicenter
48.586° N, 121.814° 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 6.9 km horizontally, 89.6 km in depth
Magnitude uncertainty
±0.09
Depth from
Operator assigned
Station coverage gap
151°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 1.97 km NW of Concrete, Washington · 15238 days ago · 1 km deep · 0 km away
  2. 2.58 km NNE of Lake Marcel-Stillwater, Washington · 15230 days ago · 0 km deep · 92 km away
  3. 2.48 km NNE of Lake Marcel-Stillwater, Washington · 15229 days ago · 1 km deep · 92 km away
  4. 1.76 km WNW of Orcas, Washington · 15220 days ago · 19 km deep · 89 km away
  5. 2.53 km E of Edison, Washington · 15220 days ago · 14 km deep · 42 km away
  6. 1.65 km E of Lake Bosworth, Washington · 15215 days ago · -1 km deep · 60 km away
  7. 2.34 km E of Edison, Washington · 15213 days ago · 14 km deep · 42 km away
  8. 1.75 km ENE of Big Lake, Washington · 15213 days ago · 8 km deep · 32 km away
  9. 1.93 km E of Granite Falls, Washington · 15213 days ago · -1 km deep · 56 km away
  10. 1.55 km S of Lake Roesiger, Washington · 15207 days ago · -1 km deep · 73 km away
  11. 1.78 km ENE of Ferndale, Washington · 15207 days ago · 12 km deep · 57 km away
  12. 1.60 km WNW of Everett, Washington · 15207 days ago · 18 km deep · 73 km away
  13. 1.76 km WSW of Lake Cavanaugh, Washington · 15206 days ago · 12 km deep · 37 km away
  14. 1.96 km WSW of Lake Cavanaugh, Washington · 15206 days ago · 12 km deep · 38 km away
  15. 1.64 km N of Bryant, Washington · 15190 days ago · 14 km deep · 43 km away
  16. 2.72 km ENE of Silvana, Washington · 15185 days ago · 4 km deep · 51 km away
  17. 2.21 km SSE of Freeland, Washington · 15184 days ago · 25 km deep · 84 km away

Before

  1. 1.74 km NNW of Bryant, Washington · 15246 days ago · 12 km deep · 44 km away
  2. 2.97 km NW of Concrete, Washington · 15248 days ago · 2 km deep · 1 km away
  3. 2.20 km N of Woodway, Washington · 15251 days ago · 22 km deep · 97 km away
  4. 1.75 km N of Hamilton, Washington · 15252 days ago · 13 km deep · 12 km away
  5. 1.66 km NNW of Concrete, Washington · 15252 days ago · 4 km deep · 2 km away
  6. 2.043 km WNW of Winthrop, Washington · 15252 days ago · -1 km deep · 85 km away
  7. 1.65 km NNW of Concrete, Washington · 15256 days ago · 3 km deep · 3 km away
  8. 1.96 km NW of Concrete, Washington · 15260 days ago · 1 km deep · 0 km away
  9. 3.27 km NW of Concrete, Washington · 15268 days ago · -1 km deep · 0 km away
  10. 3.17 km NW of Concrete, Washington · 15269 days ago · -1 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10184463. Read Tue, Sep 22, 2026, 8:09 AM UTC.