Washington earthquakes

M1.5 earthquake 1 km NE of Riverton, Washington

A magnitude 1.5 earthquake struck 1 km NE of Riverton, Washington on Mon, May 20, 1985, 9:12 PM PDT (04:12 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M3.1 4 km WSW of Wilderness Rim, 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
1.5 (md), micro
Local time
UTC
1985-05-21 04:12:27 UTC
Depth
24.8 km (15.4 mi), shallow
Epicenter
47.493° N, 122.279° 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 0.6 km horizontally, 0.9 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
51°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 22 in the 30 days before it.

After

  1. 2.820 km WSW of Brinnon, Washington · 15101 days ago · 46 km deep · 66 km away
  2. 1.52 km W of Artondale, Washington · 15101 days ago · 24 km deep · 35 km away
  3. 2.026 km NNW of Hoodsport, Washington · 15099 days ago · 46 km deep · 77 km away
  4. 1.54 km S of Big Lake, Washington · 15095 days ago · 15 km deep · 97 km away
  5. 1.6Washington · 15095 days ago · 14 km deep · 97 km away
  6. 1.716 km NNE of Ashford, Washington · 15086 days ago · 14 km deep · 71 km away
  7. 2.16 km NE of Lake Roesiger, Washington · 15086 days ago · 14 km deep · 67 km away
  8. 2.13 km SE of Lake Roesiger, Washington · 15083 days ago · 18 km deep · 60 km away
  9. 2.022 km ENE of Ashford, Washington · 15082 days ago · 1 km deep · 81 km away
  10. 1.63 km NE of Lake Marcel-Stillwater, Washington · 15080 days ago · 26 km deep · 39 km away
  11. 1.64 km ENE of Granite Falls, Washington · 15077 days ago · -1 km deep · 72 km away
  12. 3.14 km WSW of Wilderness Rim, Washington · 15075 days ago · 16 km deep · 35 km away
  13. 1.65 km S of Monroe, Washington · 15066 days ago · -1 km deep · 42 km away
  14. 1.510 km N of Camano, Washington · 15065 days ago · 53 km deep · 87 km away
  15. 1.64 km WSW of Monroe, Washington · 15063 days ago · -1 km deep · 42 km away
  16. 2.51 km SSW of Seabeck, Washington · 15060 days ago · 20 km deep · 45 km away
  17. 2.122 km ENE of Ashford, Washington · 15060 days ago · 0 km deep · 81 km away
  18. 2.123 km ENE of Ashford, Washington · 15060 days ago · -1 km deep · 82 km away
  19. 1.76 km ENE of Enumclaw, Washington · 15058 days ago · 4 km deep · 41 km away
  20. 2.07 km ENE of Snoqualmie, Washington · 15057 days ago · 8 km deep · 41 km away
  21. 3.10 km NE of Inglewood-Finn Hill, Washington · 15055 days ago · 18 km deep · 26 km away
  22. 1.51 km NE of Kingston, Washington · 15049 days ago · 21 km deep · 38 km away
  23. 1.94 km ENE of Southworth, Washington · 15049 days ago · 47 km deep · 13 km away
  24. 2.03 km N of Bryant, Washington · 15047 days ago · 15 km deep · 87 km away
  25. 1.84 km WSW of Gorst, Washington · 15046 days ago · 15 km deep · 36 km away
  26. 1.54 km SSE of Lake McMurray, Washington · 15045 days ago · 13 km deep · 87 km away
  27. 1.53 km N of Bryant, Washington · 15042 days ago · 14 km deep · 87 km away

Before

  1. 1.523 km ENE of Ashford, Washington · 15109 days ago · 2 km deep · 81 km away
  2. 1.814 km NNE of Ashford, Washington · 15112 days ago · 6 km deep · 74 km away
  3. 1.93 km WSW of Wilderness Rim, Washington · 15117 days ago · 18 km deep · 36 km away
  4. 2.24 km NW of Kingston, Washington · 15119 days ago · 21 km deep · 42 km away
  5. 2.03 km NW of Kingston, Washington · 15120 days ago · 21 km deep · 41 km away
  6. 2.84 km NW of Kingston, Washington · 15120 days ago · 22 km deep · 42 km away
  7. 2.04 km SSE of Seabeck, Washington · 15121 days ago · 22 km deep · 41 km away
  8. 1.65 km SE of Monroe, Washington · 15121 days ago · -1 km deep · 46 km away
  9. 2.21 km NNW of Ames Lake, Washington · 15122 days ago · 26 km deep · 29 km away
  10. 2.04 km NNW of Lake McMurray, Washington · 15123 days ago · 17 km deep · 96 km away
  11. 2.45 km SSW of Big Lake, Washington · 15123 days ago · 17 km deep · 96 km away
  12. 3.35 km SSW of Big Lake, Washington · 15123 days ago · 17 km deep · 96 km away
  13. 1.94 km SSW of Big Lake, Washington · 15123 days ago · 18 km deep · 97 km away
  14. 2.61 km SSE of Enetai, Washington · 15125 days ago · 26 km deep · 25 km away
  15. 3.04 km SSW of Big Lake, Washington · 15126 days ago · 17 km deep · 96 km away
  16. 2.52 km SW of Browns Point, Washington · 15127 days ago · 57 km deep · 27 km away
  17. 1.74 km SSW of Big Lake, Washington · 15127 days ago · 13 km deep · 97 km away
  18. 2.111 km WSW of Mineral, Washington · 15127 days ago · 18 km deep · 92 km away
  19. 1.74 km SSE of Monroe, Washington · 15128 days ago · -1 km deep · 43 km away
  20. 1.65 km NNW of Woods Creek, Washington · 15128 days ago · 15 km deep · 54 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10191103. Read Thu, Sep 24, 2026, 1:23 PM UTC.