Washington earthquakes

M1.5 earthquake 39 km S of Morton, Washington

A magnitude 1.5 earthquake struck 39 km S of Morton, Washington on Tue, Aug 16, 1983, 8:59 AM PDT (15:59 UTC), -2 km (-1 mi) below the surface.

A larger quake followed: M2.2 38 km NNE of Amboy, 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
1.5 (md), micro
Local time
UTC
1983-08-16 15:59:07 UTC
Depth
-1.6 km (-1.0 mi), shallow
Epicenter
46.213° 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, 2.3 km in depth
Magnitude uncertainty
±0.07
Depth from
Operator assigned
Station coverage gap
128°
Stations used
6

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 8 in the 30 days before it.

After

  1. 2.238 km NNE of Amboy, Washington · 15733 days ago · -1 km deep · 1 km away
  2. 1.615 km NNE of Packwood, Washington · 15733 days ago · 2 km deep · 74 km away
  3. 1.920 km ENE of Ashford, Washington · 15732 days ago · 0 km deep · 75 km away
  4. 2.227 km S of Greenwater, Washington · 15724 days ago · -1 km deep · 86 km away
  5. 2.238 km S of Morton, Washington · 15717 days ago · -1 km deep · 0 km away
  6. 1.823 km ESE of Packwood, Washington · 15717 days ago · -1 km deep · 70 km away
  7. 2.211 km ESE of Carbonado, Washington · 15714 days ago · 18 km deep · 95 km away
  8. 2.310 km SE of Mossyrock, Washington · 15713 days ago · 14 km deep · 32 km away
  9. 1.638 km NNE of Amboy, Washington · 15709 days ago · -1 km deep · 1 km away
  10. 2.025 km SSE of Packwood, Washington · 15704 days ago · -1 km deep · 56 km away
  11. 2.125 km SSE of Packwood, Washington · 15702 days ago · 0 km deep · 56 km away
  12. 1.625 km SSE of Packwood, Washington · 15701 days ago · 0 km deep · 56 km away
  13. 1.638 km NNE of Amboy, Washington · 15698 days ago · -1 km deep · 1 km away
  14. 2.219 km S of Morton, Washington · 15696 days ago · 8 km deep · 20 km away
  15. 1.914 km SW of Alder, Washington · 15695 days ago · -1 km deep · 59 km away
  16. 1.917 km SE of Carbonado, Washington · 15692 days ago · -1 km deep · 84 km away
  17. 1.737 km NNE of Amboy, Washington · 15691 days ago · -1 km deep · 2 km away
  18. 1.637 km NNE of Amboy, Washington · 15690 days ago · -1 km deep · 2 km away
  19. 1.520 km S of Morton, Washington · 15684 days ago · 9 km deep · 18 km away

Before

  1. 1.838 km NNE of Amboy, Washington · 15756 days ago · -2 km deep · 1 km away
  2. 2.212 km S of Pe Ell, Washington · 15756 days ago · -1 km deep · 89 km away
  3. 2.13 km NNE of Packwood, Washington · 15759 days ago · 4 km deep · 62 km away
  4. 2.38 km ENE of Kalama, Washington · 15762 days ago · 15 km deep · 47 km away
  5. 2.48 km ENE of Kalama, Washington · 15762 days ago · 15 km deep · 47 km away
  6. 2.19 km ENE of Kalama, Washington · 15762 days ago · 15 km deep · 47 km away
  7. 2.210 km N of Mossyrock, Washington · 15764 days ago · 17 km deep · 51 km away
  8. 1.838 km NNE of Amboy, Washington · 15770 days ago · -2 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10160228. Read Tue, Sep 22, 2026, 3:15 PM UTC.