Washington earthquakes

M1.8 earthquake 24 km S of Morton, Washington

A magnitude 1.8 earthquake struck 24 km S of Morton, Washington on Sat, May 31, 1986, 12:40 AM PDT (07:40 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M2.2 23 km ESE of Packwood, Washington. This one was a foreshock.

Morton 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), micro
Local time
UTC
1986-05-31 07:40:13 UTC
Depth
7.3 km (4.5 mi), shallow
Epicenter
46.342° N, 122.231° 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, 0.3 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
75°
Stations used
27

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 90 in the 30 days before it.

After

  1. 1.719 km S of Morton, Washington · 14721 days ago · 11 km deep · 5 km away
  2. 2.223 km ESE of Packwood, Washington · 14717 days ago · 5 km deep · 67 km away
  3. 2.29 km E of McKenna, Washington · 14707 days ago · 20 km deep · 66 km away
  4. 2.238 km NNE of Amboy, Washington · 14696 days ago · 0 km deep · 16 km away
  5. 1.538 km NNE of Amboy, Washington · 14692 days ago · -2 km deep · 16 km away
  6. 2.037 km NNE of Amboy, Washington · 14684 days ago · -1 km deep · 16 km away
  7. 1.828 km S of Mossyrock, Washington · 14684 days ago · 14 km deep · 18 km away
  8. 2.412 km SE of Mossyrock, Washington · 14682 days ago · 10 km deep · 16 km away
  9. 1.77 km NNW of Tenino, Washington · 14668 days ago · 52 km deep · 82 km away

Before

  1. 1.83 km E of North Plains, Oregon · 14726 days ago · 26 km deep · 99 km away
  2. 2.27 km WNW of Morton, Washington · 14732 days ago · 9 km deep · 29 km away
  3. 1.937 km NNE of Amboy, Washington · 14738 days ago · 0 km deep · 16 km away
  4. 1.938 km NNE of Amboy, Washington · 14740 days ago · -1 km deep · 16 km away
  5. 1.937 km NNE of Amboy, Washington · 14740 days ago · 0 km deep · 16 km away
  6. 1.738 km NNE of Amboy, Washington · 14740 days ago · -1 km deep · 16 km away
  7. 1.738 km NNE of Amboy, Washington · 14740 days ago · -1 km deep · 16 km away
  8. 1.738 km NNE of Amboy, Washington · 14740 days ago · -1 km deep · 16 km away
  9. 1.737 km NNE of Amboy, Washington · 14740 days ago · 0 km deep · 16 km away
  10. 1.637 km NNE of Amboy, Washington · 14741 days ago · 0 km deep · 16 km away
  11. 1.837 km NNE of Amboy, Washington · 14741 days ago · 0 km deep · 16 km away
  12. 1.937 km NNE of Amboy, Washington · 14741 days ago · 0 km deep · 16 km away
  13. 2.137 km NNE of Amboy, Washington · 14741 days ago · 0 km deep · 16 km away
  14. 1.837 km NNE of Amboy, Washington · 14741 days ago · 0 km deep · 16 km away
  15. 1.837 km NNE of Amboy, Washington · 14741 days ago · 0 km deep · 16 km away
  16. 1.737 km NNE of Amboy, Washington · 14742 days ago · -1 km deep · 16 km away
  17. 1.5Washington · 14742 days ago · 16 km deep · 33 km away
  18. 1.537 km NNE of Amboy, Washington · 14742 days ago · 0 km deep · 16 km away
  19. 1.837 km NNE of Amboy, Washington · 14742 days ago · 0 km deep · 16 km away
  20. 1.737 km NNE of Amboy, Washington · 14742 days ago · 0 km deep · 16 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10213453. Read Tue, Sep 22, 2026, 9:16 AM UTC.