Washington earthquakes

M1.6 earthquake 1 km ENE of Riverton, Washington

A magnitude 1.6 earthquake struck 1 km ENE of Riverton, Washington on Sat, Aug 21, 1976, 3:52 AM PDT (10:52 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M1.7 3 km ENE of Camano, Washington. This one was a foreshock.

Riverton 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
1.6 (md), micro
Local time
UTC
1976-08-21 10:52:38 UTC
Depth
24.2 km (15.0 mi), shallow
Epicenter
47.491° N, 122.280° 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 0.5 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
60°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 1.73 km ENE of Camano, Washington · 18292 days ago · 22 km deep · 78 km away
  2. 1.53 km WSW of Issaquah, Washington · 18290 days ago · 11 km deep · 15 km away
  3. 1.710 km W of Skokomish, Washington · 18288 days ago · 8 km deep · 79 km away
  4. 1.85 km NNE of North Bend, Washington · 18284 days ago · 13 km deep · 40 km away
  5. 1.65 km SSW of Fall City, Washington · 18283 days ago · 25 km deep · 27 km away
  6. 1.72 km NNW of Freeland, Washington · 18282 days ago · 24 km deep · 63 km away
  7. 4.76 km WSW of Coupeville, Washington · 18282 days ago · 22 km deep · 86 km away
  8. 1.515 km SW of Alder, Washington · 18280 days ago · 9 km deep · 89 km away
  9. 2.313 km E of Tanner, Washington · 18280 days ago · 15 km deep · 54 km away
  10. 2.00 km SSE of Lake Marcel-Stillwater, Washington · 18280 days ago · 27 km deep · 35 km away
  11. 4.52 km NNE of Union, Washington · 18276 days ago · 45 km deep · 63 km away
  12. 2.15 km WSW of Coupeville, Washington · 18276 days ago · 26 km deep · 87 km away
  13. 1.611 km S of Ashford, WA · 18275 days ago · 38 km deep · 94 km away
  14. 1.63 km NNW of White Center, Washington · 18272 days ago · 12 km deep · 9 km away
  15. 1.716 km NNE of Mossyrock, Washington · 18269 days ago · 12 km deep · 91 km away
  16. 1.7Puget Sound region, Washington · 18268 days ago · 18 km deep · 36 km away
  17. 1.92 km SSW of Sultan, Washington · 18265 days ago · 14 km deep · 51 km away
  18. 2.212 km W of Brinnon, Washington · 18259 days ago · 44 km deep · 63 km away
  19. 2.212 km N of Ashford, Washington · 18259 days ago · 3 km deep · 72 km away
  20. 2.12 km W of Eastmont, WA · 18253 days ago · 25 km deep · 45 km away
  21. 1.6Washington · 18251 days ago · 13 km deep · 35 km away
  22. 2.417 km NE of Ashford, Washington · 18250 days ago · 14 km deep · 74 km away
  23. 1.86 km W of Coupeville, Washington · 18250 days ago · 23 km deep · 88 km away
  24. 1.73 km NW of Snoqualmie Pass, Washington · 18246 days ago · 0 km deep · 65 km away
  25. 1.75 km ENE of Belfair, Washington · 18245 days ago · 19 km deep · 36 km away
  26. 2.014 km NNW of Morton, Washington · 18244 days ago · 11 km deep · 91 km away
  27. 1.77 km NNE of North Bend, Washington · 18241 days ago · 15 km deep · 41 km away
  28. 4.014 km NNW of Morton, Washington · 18240 days ago · 16 km deep · 91 km away
  29. 2.113 km WSW of Mineral, Washington · 18239 days ago · 16 km deep · 90 km away
  30. 2.42 km NE of Maple Valley, Washington · 18236 days ago · 13 km deep · 22 km away
  31. 1.61 km SE of Stanwood, Washington · 18235 days ago · 24 km deep · 82 km away
  32. 1.97 km ENE of Hobart, Washington · 18234 days ago · 22 km deep · 30 km away

Before

  1. 1.60 km ESE of Boulevard Park, Washington · 18295 days ago · 32 km deep · 2 km away
  2. 1.57 km NNE of Skykomish, Washington · 18304 days ago · 5 km deep · 79 km away
  3. 1.610 km NE of North Bend, Washington · 18305 days ago · 6 km deep · 45 km away
  4. 1.52 km NW of Inglewood-Finn Hill, Washington · 18309 days ago · 25 km deep · 27 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10842028. Read Tue, Sep 22, 2026, 10:00 AM UTC.