Washington earthquakes

M2.0 earthquake 13 km SSW of Alder, Washington

A magnitude 2.0 earthquake struck 13 km SSW of Alder, Washington on Tue, Apr 9, 1991, 4:05 AM PDT (11:05 UTC), 16 km (10 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
2.0 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-04-09 11:05:56 UTC
Depth
16.2 km (10.0 mi), shallow
Epicenter
46.691° N, 122.351° 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, 0.8 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
47°
Stations used
28

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 1.520 km NNW of Packwood, Washington · 12959 days ago · -1 km deep · 48 km away
  2. 2.32 km SSW of West Lake Sammamish, Washington · 12957 days ago · 12 km deep · 98 km away
  3. 1.618 km ENE of Kalama, Washington · 12954 days ago · 15 km deep · 74 km away
  4. 1.57 km W of Allyn, Washington · 12951 days ago · 14 km deep · 90 km away
  5. 1.633 km ESE of Packwood, Washington · 12948 days ago · -1 km deep · 85 km away
  6. 1.54 km NE of La Center, Washington · 12945 days ago · 15 km deep · 91 km away
  7. 2.47 km S of Longbranch, Washington · 12945 days ago · 22 km deep · 60 km away
  8. 1.937 km NNE of Amboy, Washington · 12944 days ago · -2 km deep · 56 km away
  9. 1.514 km E of Wilkeson, Washington · 12936 days ago · 7 km deep · 59 km away
  10. 1.614 km E of Wilkeson, Washington · 12936 days ago · 7 km deep · 58 km away
  11. 2.01 km SSE of Normandy Park, WA · 12935 days ago · 13 km deep · 82 km away
  12. 1.638 km NNE of Amboy, Washington · 12930 days ago · -1 km deep · 56 km away
  13. 2.123 km NE of Ashford, Washington · 12928 days ago · -1 km deep · 48 km away
  14. 1.637 km NNE of Amboy, Washington · 12923 days ago · 3 km deep · 56 km away
  15. 3.010 km E of Ashford, Washington · 12923 days ago · 10 km deep · 36 km away
  16. 1.75 km ESE of Carbonado, Washington · 12914 days ago · 10 km deep · 51 km away
  17. 2.238 km SSE of Morton, WA · 12914 days ago · 11 km deep · 54 km away
  18. 1.737 km NNE of Amboy, Washington · 12914 days ago · -2 km deep · 57 km away
  19. 1.637 km NNE of Amboy, Washington · 12914 days ago · -2 km deep · 55 km away
  20. 2.33 km SW of McCleary, Washington · 12906 days ago · 39 km deep · 81 km away

Before

  1. 1.522 km ENE of Ashford, Washington · 12964 days ago · -1 km deep · 48 km away
  2. 1.922 km ENE of Ashford, Washington · 12968 days ago · -2 km deep · 48 km away
  3. 1.722 km ENE of Ashford, Washington · 12969 days ago · -2 km deep · 48 km away
  4. 2.324 km S of Morton, Washington · 12970 days ago · 11 km deep · 40 km away
  5. 1.719 km S of Morton, Washington · 12976 days ago · 6 km deep · 34 km away
  6. 2.62 km W of Maple Valley, Washington · 12977 days ago · 5 km deep · 81 km away
  7. 2.121 km SW of Easton, Washington · 12977 days ago · -1 km deep · 87 km away
  8. 1.636 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 57 km away
  9. 2.438 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 55 km away
  10. 1.835 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 57 km away
  11. 2.138 km NNE of Amboy, Washington · 12977 days ago · 1 km deep · 55 km away
  12. 1.91 km WNW of Maple Valley, Washington · 12979 days ago · 7 km deep · 82 km away
  13. 1.816 km S of Morton, Washington · 12980 days ago · 10 km deep · 32 km away
  14. 2.410 km SSE of Mineral, Washington · 12981 days ago · 15 km deep · 18 km away
  15. 2.63 km WSW of Fox Island, Washington · 12983 days ago · 49 km deep · 66 km away
  16. 1.525 km S of Morton, Washington · 12984 days ago · 8 km deep · 41 km away
  17. 2.10 km W of Normandy Park, Washington · 12985 days ago · 18 km deep · 83 km away
  18. 2.02 km WNW of Maple Valley, Washington · 12987 days ago · 3 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10272708. Read Fri, Oct 2, 2026, 12:21 AM UTC.