Washington earthquakes

M1.8 earthquake 38 km NNE of Amboy, Washington

A magnitude 1.8 earthquake struck 38 km NNE of Amboy, Washington on Sun, Apr 15, 1990, 2:48 AM PDT (09:48 UTC), -2 km (-1 mi) below the surface.

A larger quake followed: M2.9 13 km SSW 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1990-04-15 09:48:41 UTC
Depth
-1.8 km (-1.1 mi), shallow
Epicenter
46.199° N, 122.183° 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 0.1 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.10
Depth from
Operator assigned
Station coverage gap
111°
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 30 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 1.814 km SE of Mossyrock, Washington · 13318 days ago · 17 km deep · 29 km away
  2. 2.16 km S of Mill Plain, Washington · 13314 days ago · 15 km deep · 72 km away
  3. 2.19 km W of Packwood, Washington · 13309 days ago · 8 km deep · 53 km away
  4. 2.410 km W of Packwood, Washington · 13308 days ago · 7 km deep · 52 km away
  5. 1.837 km NNE of Amboy, Washington · 13307 days ago · -2 km deep · 0 km away
  6. 1.538 km NNE of Amboy, Washington · 13305 days ago · -2 km deep · 0 km away
  7. 2.138 km NNE of Amboy, Washington · 13302 days ago · 2 km deep · 1 km away
  8. 2.237 km NNE of Amboy, Washington · 13300 days ago · 3 km deep · 1 km away
  9. 2.337 km NNE of Amboy, Washington · 13300 days ago · 3 km deep · 1 km away
  10. 1.727 km ENE of Ashford, Washington · 13299 days ago · -2 km deep · 85 km away
  11. 1.538 km NNE of Amboy, Washington · 13291 days ago · -2 km deep · 0 km away
  12. 2.913 km SSW of Morton, Washington · 13285 days ago · 18 km deep · 30 km away
  13. 1.514 km NE of Ashford, Washington · 13285 days ago · 7 km deep · 74 km away
  14. 2.224 km S of Morton, Washington · 13283 days ago · 3 km deep · 16 km away
  15. 2.623 km ENE of Ashford, Washington · 13279 days ago · -2 km deep · 80 km away
  16. 1.823 km S of Morton, Washington · 13279 days ago · 11 km deep · 17 km away
  17. 1.92 km ESE of Alder, Washington · 13278 days ago · 17 km deep · 66 km away
  18. 1.838 km NNE of Amboy, Washington · 13277 days ago · -1 km deep · 1 km away
  19. 2.28 km NNE of Government Camp, Oregon · 13276 days ago · 2 km deep · 99 km away
  20. 1.737 km NNE of Amboy, Washington · 13274 days ago · -2 km deep · 0 km away
  21. 1.838 km NNE of Amboy, Washington · 13273 days ago · -2 km deep · 0 km away
  22. 1.738 km NNE of Amboy, Washington · 13272 days ago · -2 km deep · 1 km away
  23. 1.738 km NNE of Amboy, Washington · 13272 days ago · -1 km deep · 1 km away
  24. 2.023 km ENE of Ashford, Washington · 13271 days ago · -1 km deep · 80 km away
  25. 1.74 km E of Carson, Washington · 13270 days ago · 4 km deep · 62 km away
  26. 1.94 km E of Carson, Washington · 13270 days ago · 4 km deep · 62 km away
  27. 2.0Washington · 13270 days ago · 0 km deep · 0 km away
  28. 1.526 km S of Morton, Washington · 13264 days ago · 8 km deep · 14 km away
  29. 1.528 km ENE of Ashford, Washington · 13264 days ago · -2 km deep · 86 km away
  30. 1.737 km NNE of Amboy, Washington · 13259 days ago · -1 km deep · 0 km away

Before

  1. 1.510 km E of Ashford, Washington · 13319 days ago · 7 km deep · 67 km away
  2. 2.329 km SSW of White Swan, Washington · 13319 days ago · -1 km deep · 96 km away
  3. 1.829 km SSW of White Swan, Washington · 13319 days ago · 0 km deep · 96 km away
  4. 1.522 km ENE of Ashford, Washington · 13327 days ago · -1 km deep · 79 km away
  5. 2.637 km NNE of Amboy, Washington · 13329 days ago · -2 km deep · 0 km away
  6. 1.538 km NNE of Amboy, Washington · 13330 days ago · 3 km deep · 1 km away
  7. 1.70 km SW of Garden Home-Whitford, Oregon · 13333 days ago · 21 km deep · 94 km away
  8. 3.013 km NE of Ashford, Washington · 13339 days ago · 9 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10258923. Read Thu, Oct 1, 2026, 9:12 PM UTC.