Washington earthquakes

M2.3 earthquake 24 km S of Morton, Washington

A magnitude 2.3 earthquake struck 24 km S of Morton, Washington on Fri, Mar 29, 1991, 11:37 PM PST (07:37 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M3.0 10 km E of Ashford, 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
2.3 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-03-30 07:37:19 UTC
Depth
11.0 km (6.9 mi), shallow
Epicenter
46.343° N, 122.245° 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 0.4 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.03
Depth from
From location
Station coverage gap
42°
Stations used
44

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 1.722 km ENE of Ashford, Washington · 12969 days ago · -2 km deep · 67 km away
  2. 1.922 km ENE of Ashford, Washington · 12969 days ago · -2 km deep · 67 km away
  3. 1.522 km ENE of Ashford, Washington · 12964 days ago · -1 km deep · 67 km away
  4. 2.013 km SSW of Alder, Washington · 12960 days ago · 16 km deep · 40 km away
  5. 1.520 km NNW of Packwood, Washington · 12959 days ago · -1 km deep · 63 km away
  6. 1.71 km SSW of Salmon Creek, Washington · 12958 days ago · 20 km deep · 79 km away
  7. 1.618 km ENE of Kalama, Washington · 12954 days ago · 15 km deep · 43 km away
  8. 1.633 km ESE of Packwood, Washington · 12949 days ago · -1 km deep · 73 km away
  9. 1.54 km NE of La Center, Washington · 12946 days ago · 15 km deep · 58 km away
  10. 2.47 km S of Longbranch, Washington · 12945 days ago · 22 km deep · 98 km away
  11. 1.937 km NNE of Amboy, Washington · 12944 days ago · -2 km deep · 17 km away
  12. 1.514 km E of Wilkeson, Washington · 12937 days ago · 7 km deep · 89 km away
  13. 1.614 km E of Wilkeson, Washington · 12937 days ago · 7 km deep · 88 km away
  14. 1.638 km NNE of Amboy, Washington · 12931 days ago · -1 km deep · 16 km away
  15. 2.123 km NE of Ashford, Washington · 12928 days ago · -1 km deep · 70 km away
  16. 1.637 km NNE of Amboy, Washington · 12923 days ago · 3 km deep · 16 km away
  17. 3.010 km E of Ashford, Washington · 12923 days ago · 10 km deep · 54 km away
  18. 1.75 km ESE of Carbonado, Washington · 12914 days ago · 10 km deep · 83 km away
  19. 2.238 km SSE of Morton, WA · 12914 days ago · 11 km deep · 18 km away
  20. 1.737 km NNE of Amboy, Washington · 12914 days ago · -2 km deep · 18 km away
  21. 1.637 km NNE of Amboy, Washington · 12914 days ago · -2 km deep · 16 km away
  22. 1.628 km SW of White Swan, Washington · 12910 days ago · -1 km deep · 98 km away

Before

  1. 1.719 km S of Morton, Washington · 12976 days ago · 6 km deep · 6 km away
  2. 1.636 km NNE of Amboy, Washington · 12978 days ago · -1 km deep · 17 km away
  3. 2.438 km NNE of Amboy, Washington · 12978 days ago · -1 km deep · 16 km away
  4. 1.835 km NNE of Amboy, Washington · 12978 days ago · -1 km deep · 18 km away
  5. 2.138 km NNE of Amboy, Washington · 12978 days ago · 1 km deep · 15 km away
  6. 1.816 km S of Morton, Washington · 12980 days ago · 10 km deep · 8 km away
  7. 1.97 km ESE of Venersborg, Washington · 12980 days ago · 4 km deep · 67 km away
  8. 2.410 km SSE of Mineral, Washington · 12981 days ago · 15 km deep · 33 km away
  9. 1.525 km S of Morton, Washington · 12985 days ago · 8 km deep · 2 km away
  10. 1.75 km ESE of Ridgefield, Washington · 12986 days ago · 19 km deep · 70 km away
  11. 3.15 km ESE of Ridgefield, Washington · 12995 days ago · 19 km deep · 70 km away
  12. 1.810 km ENE of Ashford, Washington · 12998 days ago · -1 km deep · 56 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10273753. Read Fri, Oct 2, 2026, 9:17 AM UTC.