Washington earthquakes

M1.7 earthquake 15 km S of Morton, Washington

A magnitude 1.7 earthquake struck 15 km S of Morton, Washington on Mon, Jan 21, 1991, 7:41 PM PST (03:41 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M3.1 5 km ESE of Ridgefield, 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
1.7 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-01-22 03:41:07 UTC
Depth
7.3 km (4.6 mi), shallow
Epicenter
46.418° N, 122.249° 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, 0.3 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
43°
Stations used
29

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 25 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 1.822 km NNW of Carson, Washington · 13030 days ago · 6 km deep · 62 km away
  2. 1.613 km SE of Rainier, Washington · 13029 days ago · 12 km deep · 48 km away
  3. 1.813 km NNE of Ashford, Washington · 13027 days ago · 7 km deep · 55 km away
  4. 1.511 km ESE of Yacolt, Washington · 13025 days ago · 8 km deep · 67 km away
  5. 1.637 km NNE of Amboy, Washington · 13024 days ago · -1 km deep · 24 km away
  6. 1.939 km S of Morton, Washington · 13022 days ago · 1 km deep · 23 km away
  7. 1.737 km NNE of Amboy, Washington · 13021 days ago · -1 km deep · 25 km away
  8. 1.537 km NE of Amboy, Washington · 13014 days ago · -2 km deep · 26 km away
  9. 1.836 km NNE of Amboy, Washington · 13013 days ago · 0 km deep · 26 km away
  10. 1.538 km NNE of Amboy, Washington · 13005 days ago · 0 km deep · 24 km away
  11. 2.610 km SSE of Mineral, Washington · 13004 days ago · 14 km deep · 25 km away
  12. 2.23 km N of North Portland, Oregon · 13004 days ago · 14 km deep · 94 km away
  13. 1.71 km NNE of Mill Plain, Washington · 13003 days ago · 11 km deep · 87 km away
  14. 1.810 km ENE of Ashford, Washington · 12997 days ago · -1 km deep · 49 km away
  15. 3.15 km ESE of Ridgefield, Washington · 12995 days ago · 19 km deep · 78 km away
  16. 1.75 km ESE of Ridgefield, Washington · 12986 days ago · 19 km deep · 77 km away
  17. 1.525 km S of Morton, Washington · 12984 days ago · 8 km deep · 10 km away
  18. 2.63 km WSW of Fox Island, Washington · 12983 days ago · 49 km deep · 97 km away
  19. 2.410 km SSE of Mineral, Washington · 12981 days ago · 15 km deep · 25 km away
  20. 1.97 km ESE of Venersborg, Washington · 12980 days ago · 4 km deep · 75 km away
  21. 1.816 km S of Morton, Washington · 12980 days ago · 10 km deep · 1 km away
  22. 2.138 km NNE of Amboy, Washington · 12977 days ago · 1 km deep · 24 km away
  23. 1.835 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 26 km away
  24. 2.438 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 24 km away
  25. 1.636 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 25 km away

Before

  1. 1.56 km SW of Packwood, Washington · 13037 days ago · 4 km deep · 42 km away
  2. 1.738 km NNE of Amboy, Washington · 13048 days ago · -1 km deep · 24 km away
  3. 1.938 km NNE of Amboy, Washington · 13054 days ago · 2 km deep · 25 km away
  4. 2.110 km SW of Greenwater, Washington · 13054 days ago · 15 km deep · 83 km away
  5. 1.84 km SSE of Walnut Grove, Washington · 13056 days ago · 17 km deep · 91 km away
  6. 1.538 km NNE of Amboy, Washington · 13057 days ago · 2 km deep · 25 km away
  7. 1.720 km S of Packwood, Washington · 13058 days ago · -1 km deep · 48 km away
  8. 2.18 km N of Bethany, Oregon · 13062 days ago · 17 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10270908. Read Fri, Oct 2, 2026, 1:00 AM UTC.