Washington earthquakes

M1.5 earthquake 8 km SW of Concrete, Washington

A magnitude 1.5 earthquake struck 8 km SW of Concrete, Washington on Tue, Apr 11, 2006, 3:15 AM PDT (10:15 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.5 4 km S of Langley, 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
1.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
2006-04-11 10:15:43 UTC
Depth
5.5 km (3.4 mi), shallow
Epicenter
48.486° N, 121.837° 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 0.6 km horizontally, 3.4 km in depth
Magnitude uncertainty
±0.05
Depth from
Operator assigned
Station coverage gap
108°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.99 km SW of Concrete, Washington · 7469 days ago · 6 km deep · 1 km away
  2. 1.92 km ENE of Granite Falls, Washington · 7466 days ago · -1 km deep · 44 km away
  3. 1.57 km S of Anacortes, Washington · 7463 days ago · 23 km deep · 58 km away
  4. 2.21 km NW of Snohomish, Washington · 7461 days ago · 25 km deep · 66 km away
  5. 1.528 km WSW of Winthrop, Washington · 7460 days ago · 3 km deep · 95 km away
  6. 1.511 km W of Port Ludlow, Washington · 7449 days ago · 33 km deep · 97 km away
  7. 1.53 km N of Langley, Canada · 7441 days ago · 1 km deep · 94 km away
  8. 1.71 km NW of Lake Marcel-Stillwater, Washington · 7440 days ago · 27 km deep · 87 km away
  9. 1.94 km NE of Big Lake, Washington · 7435 days ago · -1 km deep · 27 km away
  10. 1.95 km SW of Ault Field, Washington · 7434 days ago · 18 km deep · 69 km away
  11. 1.84 km W of Lake Cavanaugh, Washington · 7428 days ago · 13 km deep · 26 km away
  12. 2.54 km S of Langley, Washington · 7425 days ago · 57 km deep · 68 km away
  13. 2.31 km WSW of Lyman, Washington · 7423 days ago · -1 km deep · 18 km away
  14. 1.74 km SE of Clear Lake, Washington · 7420 days ago · -1 km deep · 26 km away

Before

  1. 1.53 km NE of Union Hill-Novelty Hill, Washington · 7483 days ago · 3 km deep · 88 km away
  2. 1.51 km SSW of Walnut Grove, Canada · 7483 days ago · 12 km deep · 95 km away
  3. 1.62 km NW of Edmonds, Washington · 7486 days ago · 21 km deep · 84 km away
  4. 1.513 km ESE of Acme, Washington · 7496 days ago · 2 km deep · 25 km away
  5. 1.74 km SE of Oso, Washington · 7499 days ago · 12 km deep · 28 km away
  6. 2.23 km SSW of Port Ludlow, Washington · 7499 days ago · 25 km deep · 91 km away
  7. 2.38 km NE of Lake Marcel-Stillwater, Washington · 7502 days ago · 2 km deep · 82 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10691318. Read Sat, Oct 3, 2026, 7:53 AM UTC.