Washington earthquakes

M1.6 earthquake 37 km NNE of Amboy, Washington

A magnitude 1.6 earthquake struck 37 km NNE of Amboy, Washington on Thu, Dec 20, 1990, 1:28 PM PST (21:28 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.1 36 km NNE of Amboy, Washington. This one was a foreshock.

Amboy 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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1990-12-20 21:28:59 UTC
Depth
-1.4 km (-0.9 mi), shallow
Epicenter
46.202° N, 122.192° 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, 0.1 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
55°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.136 km NNE of Amboy, Washington · 13072 days ago · 1 km deep · 1 km away
  2. 1.638 km NNE of Amboy, Washington · 13072 days ago · 0 km deep · 0 km away
  3. 1.738 km NNE of Amboy, Washington · 13072 days ago · 0 km deep · 0 km away
  4. 1.638 km NNE of Amboy, Washington · 13071 days ago · -1 km deep · 1 km away
  5. 1.538 km NNE of Amboy, Washington · 13071 days ago · 0 km deep · 0 km away
  6. 2.18 km N of Bethany, Oregon · 13064 days ago · 17 km deep · 82 km away
  7. 1.720 km S of Packwood, Washington · 13060 days ago · -1 km deep · 51 km away
  8. 1.538 km NNE of Amboy, Washington · 13060 days ago · 2 km deep · 0 km away
  9. 1.84 km SSE of Walnut Grove, Washington · 13058 days ago · 17 km deep · 71 km away
  10. 1.938 km NNE of Amboy, Washington · 13057 days ago · 2 km deep · 0 km away
  11. 1.738 km NNE of Amboy, Washington · 13051 days ago · -1 km deep · 1 km away
  12. 1.56 km SW of Packwood, Washington · 13040 days ago · 4 km deep · 53 km away
  13. 1.715 km S of Morton, Washington · 13040 days ago · 7 km deep · 24 km away
  14. 1.822 km NNW of Carson, Washington · 13033 days ago · 6 km deep · 38 km away
  15. 1.613 km SE of Rainier, Washington · 13031 days ago · 12 km deep · 72 km away
  16. 1.813 km NNE of Ashford, Washington · 13029 days ago · 7 km deep · 77 km away
  17. 1.511 km ESE of Yacolt, Washington · 13028 days ago · 8 km deep · 43 km away
  18. 1.637 km NNE of Amboy, Washington · 13026 days ago · -1 km deep · 0 km away
  19. 1.85 km SSW of Aloha, Oregon · 13025 days ago · 37 km deep · 99 km away
  20. 1.939 km S of Morton, Washington · 13025 days ago · 1 km deep · 2 km away
  21. 1.737 km NNE of Amboy, Washington · 13024 days ago · -1 km deep · 1 km away
  22. 1.537 km NE of Amboy, Washington · 13016 days ago · -2 km deep · 2 km away
  23. 1.836 km NNE of Amboy, Washington · 13016 days ago · 0 km deep · 2 km away

Before

  1. 2.325 km ENE of Ashford, Washington · 13073 days ago · -2 km deep · 81 km away
  2. 1.64 km SSW of Orting, Washington · 13078 days ago · 1 km deep · 95 km away
  3. 1.925 km ENE of Ashford, Washington · 13081 days ago · -2 km deep · 83 km away
  4. 1.84 km SSE of Mossyrock, Washington · 13087 days ago · 19 km deep · 38 km away
  5. 1.638 km NNE of Amboy, Washington · 13094 days ago · 0 km deep · 1 km away
  6. 1.837 km NNE of Amboy, Washington · 13097 days ago · 0 km deep · 1 km away
  7. 2.38 km NW of Longview Heights, Washington · 13100 days ago · 23 km deep · 64 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10270283. Read Sun, Oct 4, 2026, 5:47 PM UTC.