Washington earthquakes

M1.8 earthquake 7 km SSW of Onalaska, Washington

A magnitude 1.8 earthquake struck 7 km SSW of Onalaska, Washington on Thu, Aug 21, 2008, 6:04 AM PDT (13:04 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M2.9 23 km SSE of Mossyrock, Washington. This one was a foreshock.

Onalaska 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
2008-08-21 13:04:16 UTC
Depth
17.4 km (10.8 mi), shallow
Epicenter
46.515° N, 122.757° 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 0.7 km horizontally, 2.1 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
39°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.137 km NNE of Amboy, Washington · 6619 days ago · -1 km deep · 56 km away
  2. 1.837 km NNE of Amboy, Washington · 6617 days ago · -1 km deep · 57 km away
  3. 1.911 km NE of Ashford, Washington · 6616 days ago · 7 km deep · 72 km away
  4. 2.612 km N of Ashford, Washington · 6616 days ago · 6 km deep · 68 km away
  5. 2.430 km N of Amboy, Washington · 6612 days ago · -1 km deep · 45 km away
  6. 1.619 km SE of Carbonado, Washington · 6612 days ago · 4 km deep · 84 km away
  7. 1.57 km WSW of Morton, Washington · 6612 days ago · 19 km deep · 30 km away
  8. 1.66 km WNW of Tumwater, Washington · 6610 days ago · 0 km deep · 59 km away
  9. 1.67 km N of Bethany, Oregon · 6607 days ago · 5 km deep · 99 km away
  10. 1.837 km NNE of Amboy, Washington · 6604 days ago · 1 km deep · 56 km away
  11. 1.58 km S of Morton, Washington · 6601 days ago · 15 km deep · 37 km away
  12. 2.523 km SSE of Mossyrock, Washington · 6600 days ago · 14 km deep · 35 km away
  13. 2.923 km SSE of Mossyrock, Washington · 6600 days ago · 15 km deep · 35 km away
  14. 1.623 km SSE of Mossyrock, Washington · 6600 days ago · 16 km deep · 35 km away
  15. 2.423 km SSE of Mossyrock, Washington · 6600 days ago · 15 km deep · 35 km away
  16. 1.523 km SSE of Mossyrock, Washington · 6599 days ago · 14 km deep · 35 km away
  17. 2.137 km NNE of Amboy, Washington · 6597 days ago · -1 km deep · 56 km away
  18. 2.06 km NW of North Portland, Oregon · 6595 days ago · 17 km deep · 97 km away
  19. 1.7Washington · 6590 days ago · 12 km deep · 93 km away
  20. 1.523 km ENE of Ashford, Washington · 6589 days ago · -3 km deep · 85 km away
  21. 1.527 km NNW of Amboy, Washington · 6587 days ago · 19 km deep · 44 km away
  22. 1.910 km WSW of Porter, Washington · 6584 days ago · 23 km deep · 66 km away
  23. 1.512 km ESE of Shelton, Washington · 6584 days ago · 4 km deep · 77 km away
  24. 2.617 km SSE of Carbonado, Washington · 6580 days ago · 6 km deep · 80 km away
  25. 1.85 km WSW of Kalama, Washington · 6577 days ago · 18 km deep · 60 km away
  26. 1.711 km N of Pe Ell, Washington · 6576 days ago · 29 km deep · 45 km away
  27. 1.630 km S of Morton, Washington · 6559 days ago · 4 km deep · 49 km away

Before

  1. 1.836 km NNE of Amboy, Washington · 6622 days ago · -2 km deep · 56 km away
  2. 1.736 km NNE of Amboy, Washington · 6627 days ago · -2 km deep · 56 km away
  3. 2.537 km NNE of Amboy, Washington · 6627 days ago · -2 km deep · 56 km away
  4. 1.52 km E of Dash Point, Washington · 6628 days ago · 29 km deep · 93 km away
  5. 1.63 km NNE of Ruston, Washington · 6629 days ago · 18 km deep · 93 km away
  6. 1.90 km ESE of Brush Prairie, Washington · 6630 days ago · 17 km deep · 89 km away
  7. 1.80 km N of McKenna, Washington · 6630 days ago · 25 km deep · 50 km away
  8. 2.338 km NNE of Amboy, Washington · 6631 days ago · -2 km deep · 55 km away
  9. 1.65 km N of Mossyrock, Washington · 6635 days ago · 12 km deep · 22 km away
  10. 1.61 km ESE of Pacific, Washington · 6638 days ago · 21 km deep · 92 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10752613. Read Mon, Oct 5, 2026, 3:01 AM UTC.