Washington earthquakes

M1.6 earthquake 6 km NE of Amboy, Washington

A magnitude 1.6 earthquake struck 6 km NE of Amboy, Washington on Sat, Dec 21, 1985, 9:18 PM PST (05:18 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M1.7 25 km E of Castle Rock, 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), micro
Local time
UTC
1985-12-22 05:18:32 UTC
Depth
15.7 km (9.8 mi), shallow
Epicenter
45.954° N, 122.392° 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 0.0 km horizontally, 0.0 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
161°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 1.725 km E of Castle Rock, Washington · 14881 days ago · 17 km deep · 38 km away
  2. 3.124 km S of Morton, Washington · 14880 days ago · 6 km deep · 45 km away
  3. 2.424 km S of Morton, Washington · 14880 days ago · 6 km deep · 45 km away
  4. 1.524 km S of Morton, Washington · 14880 days ago · 7 km deep · 45 km away
  5. 1.87 km NNE of Elbe, Washington · 14879 days ago · 4 km deep · 99 km away
  6. 1.59 km ENE of Kalama, Washington · 14878 days ago · 14 km deep · 27 km away
  7. 1.514 km SSE of Ashford, Washington · 14877 days ago · 8 km deep · 84 km away
  8. 1.538 km NNE of Amboy, Washington · 14875 days ago · -2 km deep · 32 km away
  9. 2.54 km NNE of La Center, WA · 14873 days ago · 16 km deep · 21 km away
  10. 1.522 km ESE of Packwood, Washington · 14873 days ago · -1 km deep · 99 km away
  11. 1.723 km ESE of Packwood, Washington · 14873 days ago · -1 km deep · 99 km away
  12. 1.637 km S of Morton, Washington · 14856 days ago · 0 km deep · 34 km away
  13. 1.620 km S of Morton, Washington · 14855 days ago · 8 km deep · 48 km away
  14. 1.812 km ENE of Yacolt, Washington · 14852 days ago · 6 km deep · 12 km away
  15. 1.638 km NNE of Amboy, Washington · 14843 days ago · -2 km deep · 32 km away
  16. 1.638 km NNE of Amboy, Washington · 14841 days ago · -2 km deep · 32 km away
  17. 1.56 km ENE of Government Camp, Oregon · 14835 days ago · 2 km deep · 90 km away
  18. 1.838 km NNE of Amboy, Washington · 14834 days ago · -2 km deep · 32 km away
  19. 2.138 km NNE of Amboy, Washington · 14827 days ago · -1 km deep · 32 km away

Before

  1. 2.238 km NNE of Amboy, Washington · 14884 days ago · -1 km deep · 32 km away
  2. 1.537 km NNE of Amboy, Washington · 14885 days ago · -2 km deep · 32 km away
  3. 1.838 km NNE of Amboy, Washington · 14886 days ago · -2 km deep · 32 km away
  4. 1.719 km S of Morton, Washington · 14887 days ago · 8 km deep · 49 km away
  5. 1.87 km NNE of Elbe, Washington · 14893 days ago · -1 km deep · 99 km away
  6. 2.112 km N of Mossyrock, Washington · 14898 days ago · 20 km deep · 77 km away
  7. 1.528 km NW of Carson, Washington · 14907 days ago · 11 km deep · 28 km away
  8. 1.84 km NE of Government Camp, Oregon · 14912 days ago · 1 km deep · 87 km away
  9. 3.03 km WSW of Molalla, Oregon · 14913 days ago · 24 km deep · 92 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10199843. Read Tue, Sep 22, 2026, 9:10 AM UTC.