Washington earthquakes

M1.6 earthquake 5 km ENE of Onalaska, Washington

A magnitude 1.6 earthquake struck 5 km ENE of Onalaska, Washington on Sat, Aug 7, 1976, 12:43 AM PDT (07:43 UTC), 23 km (14 mi) below the surface.

A larger quake followed: M2.0 31 km S of Morton, Washington. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.6 (md), micro
Local time
UTC
1976-08-07 07:43:02 UTC
Depth
23.3 km (14.5 mi), shallow
Epicenter
46.601° N, 122.655° 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 0.0 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.07
Depth from
Operator assigned
Station coverage gap
108°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.031 km S of Morton, Washington · 18297 days ago · 18 km deep · 47 km away
  2. 1.510 km WNW of Packwood, Washington · 18296 days ago · -1 km deep · 65 km away
  3. 2.221 km SSE of Mossyrock, Washington · 18296 days ago · 3 km deep · 35 km away
  4. 1.710 km W of Skokomish, Washington · 18288 days ago · 8 km deep · 94 km away
  5. 1.628 km NW of Trout Lake, Washington · 18282 days ago · 9 km deep · 82 km away
  6. 1.62 km ENE of Brush Prairie, Washington · 18282 days ago · 10 km deep · 96 km away
  7. 1.515 km SW of Alder, Washington · 18280 days ago · 9 km deep · 21 km away
  8. 1.94 km W of Packwood, Washington · 18278 days ago · 5 km deep · 71 km away
  9. 4.52 km NNE of Union, Washington · 18276 days ago · 45 km deep · 92 km away
  10. 1.730 km N of Amboy, Washington · 18275 days ago · 1 km deep · 49 km away
  11. 1.611 km S of Ashford, WA · 18275 days ago · 38 km deep · 46 km away
  12. 1.716 km NNE of Mossyrock, Washington · 18269 days ago · 12 km deep · 19 km away
  13. 1.7Puget Sound region, Washington · 18268 days ago · 18 km deep · 98 km away
  14. 2.212 km N of Ashford, Washington · 18258 days ago · 3 km deep · 57 km away
  15. 2.417 km NE of Ashford, Washington · 18250 days ago · 14 km deep · 66 km away

Before

  1. 1.739 km SSE of Morton, Washington · 18309 days ago · 4 km deep · 60 km away
  2. 1.824 km NW of Trout Lake, Washington · 18315 days ago · 3 km deep · 86 km away
  3. 1.931 km SSE of Mossyrock, Washington · 18318 days ago · 3 km deep · 44 km away
  4. 1.65 km W of Wauna, Washington · 18325 days ago · 21 km deep · 88 km away
  5. 1.87 km NNE of Onalaska, Washington · 18328 days ago · 22 km deep · 4 km away
  6. 1.637 km SE of Morton, Washington · 18332 days ago · 3 km deep · 63 km away
  7. 1.67 km SSE of McKenna, Washington · 18337 days ago · 15 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10841933. Read Tue, Sep 22, 2026, 9:30 AM UTC.