Washington earthquakes

M1.5 earthquake 0 km WNW of Oso, Washington

A magnitude 1.5 earthquake struck 0 km WNW of Oso, Washington on Fri, May 21, 2004, 3:39 AM PDT (10:39 UTC), 14 km (8 mi) below the surface.

A larger quake followed: M2.8 12 km NNE of Concrete, Washington. This one was a foreshock.

Arlington Heights 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
2004-05-21 10:39:33 UTC
Depth
13.6 km (8.4 mi), shallow
Epicenter
48.272° N, 121.935° 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 1.9 km horizontally, 3.5 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
108°
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: 20 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 1.90 km W of Mountlake Terrace, Washington · 8166 days ago · 28 km deep · 61 km away
  2. 2.019 km ENE of Darrington, Washington · 8162 days ago · 9 km deep · 44 km away
  3. 1.53 km ESE of Oso, Washington · 8156 days ago · 13 km deep · 4 km away
  4. 2.812 km NNE of Concrete, Washington · 8147 days ago · -1 km deep · 45 km away
  5. 1.810 km NNE of Concrete, Washington · 8147 days ago · 0 km deep · 44 km away
  6. 1.66 km NE of Verlot, Washington · 8141 days ago · 6 km deep · 22 km away
  7. 1.910 km NE of Verlot, Washington · 8141 days ago · 7 km deep · 22 km away
  8. 1.66 km S of Wilderness Rim, Washington · 8135 days ago · 18 km deep · 99 km away
  9. 2.84 km NNE of Anacortes, Washington · 8135 days ago · 19 km deep · 58 km away
  10. 2.21 km N of Big Lake, Washington · 8132 days ago · -1 km deep · 28 km away
  11. 2.01 km N of Big Lake, Washington · 8131 days ago · 1 km deep · 28 km away
  12. 2.02 km N of Maple Valley, Washington · 8130 days ago · 6 km deep · 96 km away
  13. 2.110 km NNE of Snoqualmie, Washington · 8125 days ago · 14 km deep · 75 km away
  14. 1.85 km ESE of Oso, Washington · 8124 days ago · 10 km deep · 6 km away
  15. 1.611 km N of Quilcene, Washington · 8120 days ago · 27 km deep · 81 km away
  16. 2.26 km NNW of North Sultan, Washington · 8119 days ago · 16 km deep · 38 km away
  17. 2.18 km SSW of Anacortes, Washington · 8115 days ago · 23 km deep · 56 km away
  18. 1.73 km SSE of Carnation, Washington · 8112 days ago · 19 km deep · 73 km away
  19. 1.72 km NNW of White Center, Washington · 8111 days ago · 23 km deep · 88 km away
  20. 2.22 km NNW of Mill Creek, Washington · 8110 days ago · 24 km deep · 48 km away

Before

  1. 1.94 km ESE of Lake Marcel-Stillwater, Washington · 8190 days ago · 13 km deep · 67 km away
  2. 2.32 km SSE of Maple Heights-Lake Desire, Washington · 8190 days ago · 22 km deep · 95 km away
  3. 2.55 km SW of Sultan, Washington · 8195 days ago · 17 km deep · 50 km away
  4. 1.54 km W of Orcas, Washington · 8197 days ago · 13 km deep · 87 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10611503. Read Fri, Oct 2, 2026, 5:31 AM UTC.