Washington earthquakes

M1.8 earthquake 7 km NNE of Onalaska, Washington

A magnitude 1.8 earthquake struck 7 km NNE of Onalaska, Washington on Sun, Jul 18, 1976, 9:31 AM PDT (16:31 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M1.9 31 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), micro
Local time
UTC
1976-07-18 16:31:08 UTC
Depth
22.3 km (13.8 mi), shallow
Epicenter
46.636° N, 122.680° 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 0.4 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
102°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 1.65 km W of Wauna, Washington · 18325 days ago · 21 km deep · 84 km away
  2. 1.931 km SSE of Mossyrock, Washington · 18318 days ago · 3 km deep · 48 km away
  3. 1.824 km NW of Trout Lake, Washington · 18316 days ago · 3 km deep · 90 km away
  4. 1.739 km SSE of Morton, Washington · 18310 days ago · 4 km deep · 64 km away
  5. 1.65 km ENE of Onalaska, Washington · 18308 days ago · 23 km deep · 4 km away
  6. 2.031 km S of Morton, Washington · 18297 days ago · 18 km deep · 51 km away
  7. 1.510 km WNW of Packwood, Washington · 18297 days ago · -1 km deep · 67 km away
  8. 2.221 km SSE of Mossyrock, Washington · 18297 days ago · 3 km deep · 39 km away
  9. 1.60 km ESE of Boulevard Park, Washington · 18295 days ago · 32 km deep · 99 km away
  10. 1.61 km ENE of Riverton, Washington · 18294 days ago · 24 km deep · 100 km away
  11. 1.710 km W of Skokomish, Washington · 18289 days ago · 8 km deep · 90 km away
  12. 1.628 km NW of Trout Lake, Washington · 18282 days ago · 9 km deep · 86 km away
  13. 1.62 km ENE of Brush Prairie, Washington · 18282 days ago · 10 km deep · 100 km away
  14. 1.515 km SW of Alder, Washington · 18281 days ago · 9 km deep · 21 km away
  15. 1.94 km W of Packwood, Washington · 18278 days ago · 5 km deep · 73 km away
  16. 4.52 km NNE of Union, Washington · 18276 days ago · 45 km deep · 88 km away
  17. 1.730 km N of Amboy, Washington · 18275 days ago · 1 km deep · 53 km away
  18. 1.611 km S of Ashford, WA · 18275 days ago · 38 km deep · 48 km away
  19. 1.716 km NNE of Mossyrock, Washington · 18269 days ago · 12 km deep · 19 km away

Before

  1. 1.637 km SE of Morton, Washington · 18332 days ago · 3 km deep · 67 km away
  2. 1.67 km SSE of McKenna, Washington · 18337 days ago · 15 km deep · 30 km away
  3. 1.737 km SSE of Morton, Washington · 18339 days ago · 30 km deep · 62 km away
  4. 1.85 km W of Ashford, Washington · 18340 days ago · 17 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10841778. Read Tue, Sep 22, 2026, 2:35 PM UTC.