Washington earthquakes

M1.8 earthquake 1 km WSW of Riverton, Washington

A magnitude 1.8 earthquake struck 1 km WSW of Riverton, Washington on Mon, May 30, 1988, 9:38 AM PDT (16:38 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M4.1 13 km NE of Ashford, 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1988-05-30 16:38:46 UTC
Depth
25.3 km (15.7 mi), shallow
Epicenter
47.480° N, 122.308° 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 0.3 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
44°
Stations used
38

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 36 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.52 km S of Issaquah, Washington · 13999 days ago · -1 km deep · 21 km away
  2. 2.23 km ESE of Belfair, Washington · 13997 days ago · 21 km deep · 36 km away
  3. 1.63 km NNE of Union Hill-Novelty Hill, WA · 13995 days ago · 3 km deep · 34 km away
  4. 1.92 km WNW of Maple Valley, Washington · 13989 days ago · 18 km deep · 19 km away
  5. 3.12 km NE of Lake Marcel-Stillwater, Washington · 13987 days ago · 7 km deep · 40 km away
  6. 1.712 km ESE of Ashford, Washington · 13985 days ago · 5 km deep · 89 km away
  7. 2.21 km SW of Lake Marcel-Stillwater, Washington · 13983 days ago · -1 km deep · 36 km away
  8. 1.51 km E of Clyde Hill, Washington · 13981 days ago · 24 km deep · 19 km away
  9. 2.24 km WSW of Darrington, Washington · 13973 days ago · 2 km deep · 97 km away
  10. 1.617 km ESE of Verlot, Washington · 13973 days ago · 2 km deep · 80 km away
  11. 2.34 km WSW of Darrington, Washington · 13973 days ago · 1 km deep · 97 km away
  12. 1.72 km W of Tanner, Washington · 13969 days ago · 17 km deep · 40 km away
  13. 2.14 km NNE of Key Center, Washington · 13969 days ago · 23 km deep · 33 km away
  14. 2.14 km WSW of Wilderness Rim, Washington · 13968 days ago · 18 km deep · 36 km away
  15. 3.218 km E of Verlot, Washington · 13966 days ago · -1 km deep · 89 km away
  16. 1.91 km E of White Center, Washington · 13964 days ago · 23 km deep · 5 km away
  17. 3.15 km W of Lake Cavanaugh, Washington · 13959 days ago · 12 km deep · 95 km away
  18. 2.04 km NE of Duvall, Washington · 13958 days ago · 25 km deep · 42 km away
  19. 1.713 km NW of Morton, Washington · 13958 days ago · 21 km deep · 93 km away
  20. 1.52 km NW of Woods Creek, Washington · 13955 days ago · 16 km deep · 54 km away
  21. 1.53 km WSW of Artondale, Washington · 13955 days ago · 25 km deep · 34 km away
  22. 1.91 km WNW of Hansville, Washington · 13954 days ago · 13 km deep · 53 km away
  23. 2.31 km ESE of Edmonds, Washington · 13952 days ago · 22 km deep · 37 km away
  24. 2.224 km ENE of Ashford, Washington · 13949 days ago · -1 km deep · 82 km away
  25. 1.95 km ENE of Lofall, Washington · 13945 days ago · 21 km deep · 43 km away
  26. 1.81 km SE of Parkwood, Washington · 13945 days ago · 42 km deep · 22 km away
  27. 4.113 km NE of Ashford, Washington · 13944 days ago · 11 km deep · 76 km away
  28. 1.514 km NE of Ashford, Washington · 13944 days ago · 9 km deep · 76 km away
  29. 1.514 km NE of Ashford, Washington · 13944 days ago · 9 km deep · 76 km away
  30. 2.014 km NE of Ashford, Washington · 13944 days ago · 8 km deep · 76 km away
  31. 3.813 km NE of Ashford, Washington · 13944 days ago · 10 km deep · 76 km away
  32. 1.914 km NE of Ashford, Washington · 13944 days ago · 9 km deep · 76 km away
  33. 1.914 km NE of Ashford, Washington · 13944 days ago · 9 km deep · 76 km away
  34. 1.817 km NNE of Ashford, Washington · 13944 days ago · 4 km deep · 69 km away
  35. 1.714 km NE of Ashford, Washington · 13944 days ago · 9 km deep · 76 km away
  36. 1.813 km NE of Ashford, Washington · 13944 days ago · 9 km deep · 76 km away

Before

  1. 2.29 km S of Sultan, Washington · 14005 days ago · 13 km deep · 48 km away
  2. 1.511 km S of Greenwater, Washington · 14007 days ago · 0 km deep · 69 km away
  3. 2.52 km WSW of Artondale, Washington · 14007 days ago · 21 km deep · 34 km away
  4. 1.519 km SSE of Carbonado, Washington · 14021 days ago · 11 km deep · 68 km away
  5. 1.61 km W of Wauna, Washington · 14025 days ago · 24 km deep · 29 km away
  6. 1.524 km ENE of Ashford, Washington · 14031 days ago · -1 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10232743. Read Fri, Oct 2, 2026, 3:42 PM UTC.