Washington earthquakes

M1.6 earthquake 19 km S of Morton, Washington

A magnitude 1.6 earthquake struck 19 km S of Morton, Washington on Sun, Jun 23, 1991, 9:12 PM PDT (04:12 UTC), 12 km (8 mi) below the surface.

A larger quake followed: M3.5 8 km N of Bethany, Oregon. 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
1.6 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-06-24 04:12:24 UTC
Depth
12.2 km (7.6 mi), shallow
Epicenter
46.380° N, 122.265° 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, 0.4 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
44°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.028 km ENE of Ashford, Washington · 12883 days ago · -1 km deep · 71 km away
  2. 2.010 km SSE of Mineral, Washington · 12882 days ago · 14 km deep · 29 km away
  3. 1.86 km WNW of Scappoose, Oregon · 12874 days ago · 16 km deep · 85 km away
  4. 1.631 km NNE of Amboy, Washington · 12873 days ago · 9 km deep · 22 km away
  5. 2.037 km NNE of Amboy, Washington · 12866 days ago · -2 km deep · 22 km away
  6. 2.54 km NE of Enumclaw, Washington · 12865 days ago · 16 km deep · 98 km away
  7. 1.55 km ENE of Enumclaw, Washington · 12864 days ago · 16 km deep · 98 km away
  8. 1.636 km NNE of Amboy, Washington · 12862 days ago · -1 km deep · 22 km away
  9. 1.58 km N of Bethany, Oregon · 12861 days ago · 16 km deep · 95 km away
  10. 1.926 km WNW of Trout Lake, Washington · 12859 days ago · 14 km deep · 46 km away
  11. 2.08 km N of Bethany, Oregon · 12858 days ago · 17 km deep · 95 km away
  12. 2.48 km N of Bethany, Oregon · 12856 days ago · 17 km deep · 95 km away
  13. 3.58 km N of Bethany, Oregon · 12856 days ago · 19 km deep · 95 km away
  14. 2.28 km N of Bethany, Oregon · 12856 days ago · 16 km deep · 95 km away
  15. 2.28 km N of Bethany, Oregon · 12856 days ago · 17 km deep · 95 km away
  16. 1.78 km N of Bethany, Oregon · 12856 days ago · 16 km deep · 95 km away
  17. 2.39 km N of Bethany, Oregon · 12856 days ago · 17 km deep · 94 km away
  18. 1.88 km N of Bethany, Oregon · 12856 days ago · 17 km deep · 95 km away
  19. 1.57 km W of Morton, Washington · 12856 days ago · 7 km deep · 22 km away
  20. 1.88 km N of Bethany, Oregon · 12855 days ago · 16 km deep · 95 km away
  21. 2.238 km NNE of Amboy, Washington · 12852 days ago · 0 km deep · 21 km away
  22. 1.78 km N of Bethany, Oregon · 12852 days ago · 16 km deep · 95 km away
  23. 2.88 km N of Bethany, Oregon · 12851 days ago · 19 km deep · 95 km away
  24. 2.310 km ENE of Ashford, Washington · 12849 days ago · 6 km deep · 53 km away
  25. 1.59 km N of Bethany, Oregon · 12849 days ago · 15 km deep · 94 km away
  26. 2.28 km N of Bethany, Oregon · 12848 days ago · 17 km deep · 95 km away
  27. 1.79 km N of Bethany, Oregon · 12847 days ago · 6 km deep · 94 km away
  28. 1.89 km ENE of Ashford, Washington · 12845 days ago · 5 km deep · 52 km away
  29. 2.39 km ENE of Ashford, Washington · 12845 days ago · 5 km deep · 52 km away
  30. 2.016 km N of Amboy, Washington · 12839 days ago · 17 km deep · 38 km away
  31. 1.75 km SSE of Mineral, Washington · 12836 days ago · 18 km deep · 34 km away
  32. 2.09 km ENE of Ashford, Washington · 12830 days ago · 6 km deep · 52 km away

Before

  1. 2.623 km ENE of Ashford, Washington · 12887 days ago · -2 km deep · 67 km away
  2. 2.122 km SSE of Greenwater, Washington · 12887 days ago · 10 km deep · 84 km away
  3. 1.637 km NNE of Amboy, Washington · 12888 days ago · -1 km deep · 22 km away
  4. 2.632 km NE of Amboy, Washington · 12889 days ago · 11 km deep · 36 km away
  5. 1.637 km NNE of Amboy, Washington · 12900 days ago · -2 km deep · 22 km away
  6. 1.637 km NNE of Amboy, Washington · 12914 days ago · -2 km deep · 20 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10279778. Read Fri, Oct 2, 2026, 3:23 PM UTC.