Washington earthquakes

M1.9 earthquake 6 km NW of Sedro-Woolley, Washington

A magnitude 1.9 earthquake struck 6 km NW of Sedro-Woolley, Washington on Wed, Apr 28, 1976, 2:09 AM PDT (09:09 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M5.1 10 km ESE of Salt Spring Island, Canada. This one was a foreshock.

Sedro-Woolley 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
1976-04-28 09:09:51 UTC
Depth
-0.8 km (-0.5 mi), shallow
Epicenter
48.548° N, 122.284° 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 0.1 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
160°
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: 16 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 2.01 km SE of Esperance, Washington · 18419 days ago · 19 km deep · 86 km away
  2. 1.61 km SSW of Mountlake Terrace, Washington · 18419 days ago · 23 km deep · 86 km away
  3. 1.51 km E of Lake Roesiger, Washington · 18418 days ago · 0 km deep · 69 km away
  4. 1.61 km NE of Edmonds, Washington · 18418 days ago · 5 km deep · 81 km away
  5. 1.87 km ESE of Quilcene, Washington · 18416 days ago · 17 km deep · 91 km away
  6. 2.16 km NW of Orcas, Washington · 18413 days ago · 17 km deep · 54 km away
  7. 2.48 km NNE of Marrowstone, Washington · 18412 days ago · 53 km deep · 55 km away
  8. 2.414 km WNW of Orcas, Washington · 18411 days ago · 14 km deep · 63 km away
  9. 1.63 km ENE of Union Hill-Novelty Hill, Washington · 18404 days ago · 24 km deep · 98 km away
  10. 5.110 km ESE of Salt Spring Island, Canada · 18401 days ago · 62 km deep · 84 km away
  11. 2.28 km S of Concrete, Washington · 18382 days ago · 4 km deep · 42 km away
  12. 1.73 km S of Lake Forest Park, Washington · 18382 days ago · 24 km deep · 92 km away
  13. 2.112 km NE of May Creek, Washington · 18369 days ago · 3 km deep · 86 km away
  14. 2.11 km W of Lake McMurray, Washington · 18365 days ago · 7 km deep · 26 km away
  15. 1.610 km NE of May Creek, Washington · 18365 days ago · 3 km deep · 86 km away
  16. 1.66 km SSW of La Conner, Washington · 18363 days ago · 14 km deep · 30 km away

Before

  1. 2.72 km SW of Mountlake Terrace, Washington · 18419 days ago · 27 km deep · 86 km away
  2. 1.76 km NW of Orcas, Washington · 18429 days ago · 15 km deep · 54 km away
  3. 1.67 km WSW of Camano, Washington · 18433 days ago · 28 km deep · 51 km away
  4. 1.50 km SSW of Lynnwood, Washington · 18445 days ago · 4 km deep · 81 km away
  5. 1.61 km ENE of Everett, Washington · 18446 days ago · 21 km deep · 63 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10841238. Read Fri, Oct 2, 2026, 1:16 AM UTC.