Washington earthquakes

M1.5 earthquake 7 km W of Morton, Washington

A magnitude 1.5 earthquake struck 7 km W of Morton, Washington on Mon, Jul 22, 1991, 2:46 PM PDT (21:46 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.8 37 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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-07-22 21:46:28 UTC
Depth
7.2 km (4.5 mi), shallow
Epicenter
46.568° N, 122.370° 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 0.5 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
92°
Stations used
25

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 24 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.238 km NNE of Amboy, Washington · 12852 days ago · 0 km deep · 43 km away
  2. 2.310 km ENE of Ashford, Washington · 12849 days ago · 6 km deep · 43 km away
  3. 1.89 km ENE of Ashford, Washington · 12844 days ago · 5 km deep · 42 km away
  4. 2.39 km ENE of Ashford, Washington · 12844 days ago · 5 km deep · 42 km away
  5. 2.03 km WNW of Maple Valley, Washington · 12841 days ago · 5 km deep · 95 km away
  6. 2.016 km N of Amboy, Washington · 12838 days ago · 17 km deep · 57 km away
  7. 1.75 km SSE of Mineral, Washington · 12835 days ago · 18 km deep · 21 km away
  8. 2.09 km ENE of Ashford, Washington · 12829 days ago · 6 km deep · 42 km away
  9. 2.33 km W of Wauna, Washington · 12826 days ago · 20 km deep · 93 km away
  10. 1.628 km N of Packwood, Washington · 12821 days ago · -1 km deep · 62 km away
  11. 1.73 km SW of Tacoma, Washington · 12819 days ago · 49 km deep · 74 km away
  12. 2.238 km NNE of Amboy, Washington · 12819 days ago · -2 km deep · 43 km away
  13. 1.738 km S of Morton, Washington · 12818 days ago · 3 km deep · 42 km away
  14. 2.038 km NNE of Amboy, Washington · 12818 days ago · -1 km deep · 44 km away
  15. 1.53 km SSW of Des Moines, Washington · 12813 days ago · 18 km deep · 90 km away
  16. 2.222 km ENE of Ashford, Washington · 12812 days ago · -2 km deep · 56 km away
  17. 2.237 km NNE of Amboy, Washington · 12811 days ago · -2 km deep · 45 km away
  18. 2.837 km NNE of Amboy, Washington · 12806 days ago · 3 km deep · 44 km away
  19. 2.019 km S of Morton, Washington · 12805 days ago · 16 km deep · 22 km away
  20. 2.238 km NNE of Amboy, Washington · 12805 days ago · 2 km deep · 43 km away
  21. 2.138 km NNE of Amboy, Washington · 12803 days ago · 5 km deep · 43 km away
  22. 1.838 km NNE of Amboy, Washington · 12803 days ago · 3 km deep · 43 km away
  23. 2.333 km NE of Amboy, Washington · 12799 days ago · 0 km deep · 50 km away
  24. 1.836 km NNE of Amboy, Washington · 12799 days ago · -2 km deep · 44 km away

Before

  1. 1.926 km WNW of Trout Lake, Washington · 12858 days ago · 14 km deep · 67 km away
  2. 1.636 km NNE of Amboy, Washington · 12862 days ago · -1 km deep · 44 km away
  3. 1.55 km ENE of Enumclaw, Washington · 12863 days ago · 16 km deep · 81 km away
  4. 2.54 km NE of Enumclaw, Washington · 12864 days ago · 16 km deep · 81 km away
  5. 2.037 km NNE of Amboy, Washington · 12866 days ago · -2 km deep · 44 km away
  6. 1.631 km NNE of Amboy, Washington · 12872 days ago · 9 km deep · 42 km away
  7. 1.86 km WNW of Scappoose, Oregon · 12873 days ago · 16 km deep · 98 km away
  8. 2.010 km SSE of Mineral, Washington · 12881 days ago · 14 km deep · 19 km away
  9. 2.028 km ENE of Ashford, Washington · 12882 days ago · -1 km deep · 61 km away
  10. 1.619 km S of Morton, Washington · 12884 days ago · 12 km deep · 22 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10281368. Read Fri, Oct 2, 2026, 3:07 AM UTC.