Washington earthquakes

M2.1 earthquake 0 km E of Riverton, Washington

A magnitude 2.1 earthquake struck 0 km E of Riverton, Washington on Tue, Oct 18, 1977, 5:22 PM PDT (00:22 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M2.7 Olympic Peninsula, 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
2.1 (md), micro
Local time
UTC
1977-10-19 00:22:41 UTC
Depth
22.3 km (13.9 mi), shallow
Epicenter
47.484° N, 122.286° 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, 0.5 km in depth
Depth from
From location
Station coverage gap
118°
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: 20 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 2.42 km NNE of Coupeville, Washington · 17875 days ago · 22 km deep · 89 km away
  2. 2.1Washington · 17869 days ago · 7 km deep · 38 km away
  3. 2.18 km NE of Duvall, Washington · 17869 days ago · 16 km deep · 45 km away
  4. 2.125 km W of Skokomish, Washington · 17868 days ago · -1 km deep · 93 km away
  5. 2.427 km W of Skokomish, Washington · 17868 days ago · 1 km deep · 94 km away
  6. 1.9Olympic Peninsula, Washington · 17868 days ago · 1 km deep · 94 km away
  7. 2.7Olympic Peninsula, Washington · 17868 days ago · 0 km deep · 93 km away
  8. 1.62 km W of Burley, Washington · 17860 days ago · 21 km deep · 30 km away
  9. 1.61 km N of Esperance, Washington · 17860 days ago · 6 km deep · 35 km away
  10. 1.92 km SSE of Three Lakes, Washington · 17853 days ago · 8 km deep · 54 km away
  11. 1.92 km WSW of Ashford, Washington · 17853 days ago · 0 km deep · 83 km away
  12. 1.92 km SW of Ashford, Washington · 17853 days ago · -1 km deep · 84 km away
  13. 1.91 km NE of Maple Heights-Lake Desire, Washington · 17840 days ago · 16 km deep · 15 km away
  14. 2.124 km N of Packwood, Washington · 17837 days ago · 5 km deep · 86 km away
  15. 1.821 km SE of Carbonado, Washington · 17835 days ago · 17 km deep · 67 km away
  16. 1.70 km NNW of Clyde Hill, Washington · 17829 days ago · 21 km deep · 17 km away
  17. 2.11 km WNW of Indianola, Washington · 17827 days ago · 18 km deep · 36 km away
  18. 1.57 km WNW of Swede Heaven, Washington · 17824 days ago · 6 km deep · 97 km away
  19. 1.87 km NNE of Bryant, Washington · 17824 days ago · 2 km deep · 92 km away
  20. 1.63 km W of Suquamish, Washington · 17821 days ago · 24 km deep · 36 km away

Before

  1. 1.625 km ENE of Ashford, Washington · 17879 days ago · 0 km deep · 82 km away
  2. 1.62 km NW of White Center, Washington · 17881 days ago · 19 km deep · 8 km away
  3. 1.82 km NNE of Carnation, Washington · 17885 days ago · 22 km deep · 36 km away
  4. 1.54 km E of Echo Lake, Washington · 17887 days ago · 19 km deep · 41 km away
  5. 1.81 km E of Enetai, Washington · 17888 days ago · 20 km deep · 25 km away
  6. 1.63 km NW of Suquamish, Washington · 17888 days ago · 21 km deep · 38 km away
  7. 1.64 km WNW of Mercer Island, Washington · 17893 days ago · 38 km deep · 12 km away
  8. 1.56 km SSW of Hansville, Washington · 17896 days ago · 15 km deep · 48 km away
  9. 1.914 km E of Wilkeson, Washington · 17897 days ago · 7 km deep · 54 km away
  10. 1.915 km NNE of Ashford, Washington · 17901 days ago · 4 km deep · 71 km away
  11. 1.96 km E of Arlington Heights, Washington · 17902 days ago · 18 km deep · 82 km away
  12. 1.63 km NE of Bonney Lake, Washington · 17904 days ago · 15 km deep · 33 km away
  13. 1.74 km NE of North Bend, Washington · 17905 days ago · -1 km deep · 41 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10844943. Read Tue, Sep 29, 2026, 11:11 PM UTC.