Washington earthquakes

M1.8 earthquake 16 km S of Morton, Washington

A magnitude 1.8 earthquake struck 16 km S of Morton, Washington on Tue, Mar 19, 1991, 9:09 PM PST (05:09 UTC), 10 km (6 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-03-20 05:09:14 UTC
Depth
10.1 km (6.3 mi), shallow
Epicenter
46.414° N, 122.258° 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 0.2 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
48°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.138 km NNE of Amboy, Washington · 12979 days ago · 1 km deep · 23 km away
  2. 1.835 km NNE of Amboy, Washington · 12979 days ago · -1 km deep · 26 km away
  3. 2.438 km NNE of Amboy, Washington · 12979 days ago · -1 km deep · 24 km away
  4. 1.636 km NNE of Amboy, Washington · 12979 days ago · -1 km deep · 25 km away
  5. 1.719 km S of Morton, Washington · 12977 days ago · 6 km deep · 4 km away
  6. 2.324 km S of Morton, Washington · 12971 days ago · 11 km deep · 8 km away
  7. 1.722 km ENE of Ashford, Washington · 12970 days ago · -2 km deep · 61 km away
  8. 1.922 km ENE of Ashford, Washington · 12970 days ago · -2 km deep · 61 km away
  9. 1.522 km ENE of Ashford, Washington · 12965 days ago · -1 km deep · 61 km away
  10. 2.013 km SSW of Alder, Washington · 12961 days ago · 16 km deep · 32 km away
  11. 1.520 km NNW of Packwood, Washington · 12960 days ago · -1 km deep · 57 km away
  12. 1.71 km SSW of Salmon Creek, Washington · 12959 days ago · 20 km deep · 86 km away
  13. 1.618 km ENE of Kalama, Washington · 12955 days ago · 15 km deep · 49 km away
  14. 1.633 km ESE of Packwood, Washington · 12950 days ago · -1 km deep · 73 km away
  15. 1.54 km NE of La Center, Washington · 12947 days ago · 15 km deep · 65 km away
  16. 2.47 km S of Longbranch, Washington · 12946 days ago · 22 km deep · 90 km away
  17. 1.937 km NNE of Amboy, Washington · 12946 days ago · -2 km deep · 25 km away
  18. 1.514 km E of Wilkeson, Washington · 12938 days ago · 7 km deep · 82 km away
  19. 1.614 km E of Wilkeson, Washington · 12938 days ago · 7 km deep · 81 km away
  20. 1.638 km NNE of Amboy, Washington · 12932 days ago · -1 km deep · 24 km away
  21. 2.123 km NE of Ashford, Washington · 12930 days ago · -1 km deep · 64 km away
  22. 1.637 km NNE of Amboy, Washington · 12925 days ago · 3 km deep · 24 km away
  23. 3.010 km E of Ashford, Washington · 12924 days ago · 10 km deep · 48 km away

Before

  1. 1.97 km ESE of Venersborg, Washington · 12981 days ago · 4 km deep · 74 km away
  2. 2.410 km SSE of Mineral, Washington · 12982 days ago · 15 km deep · 25 km away
  3. 2.63 km WSW of Fox Island, Washington · 12985 days ago · 49 km deep · 97 km away
  4. 1.525 km S of Morton, Washington · 12986 days ago · 8 km deep · 10 km away
  5. 1.75 km ESE of Ridgefield, Washington · 12987 days ago · 19 km deep · 77 km away
  6. 3.15 km ESE of Ridgefield, Washington · 12996 days ago · 19 km deep · 77 km away
  7. 1.810 km ENE of Ashford, Washington · 12999 days ago · -1 km deep · 49 km away
  8. 1.71 km NNE of Mill Plain, Washington · 13004 days ago · 11 km deep · 86 km away
  9. 2.23 km N of North Portland, Oregon · 13005 days ago · 14 km deep · 93 km away
  10. 2.610 km SSE of Mineral, Washington · 13005 days ago · 14 km deep · 26 km away
  11. 1.538 km NNE of Amboy, Washington · 13007 days ago · 0 km deep · 24 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10272108. Read Sat, Oct 3, 2026, 11:57 AM UTC.