Washington earthquakes

M1.5 earthquake 20 km S of Morton, Washington

A magnitude 1.5 earthquake struck 20 km S of Morton, Washington on Fri, Aug 26, 1988, 6:35 PM PDT (01:35 UTC), 10 km (7 mi) below the surface.

A larger quake followed: M2.4 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
1988-08-27 01:35:24 UTC
Depth
10.5 km (6.5 mi), shallow
Epicenter
46.371° N, 122.256° 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
±0.06
Depth from
From location
Station coverage gap
53°
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: 13 in the 60 days after this one and 23 in the 30 days before it.

After

  1. 1.614 km NE of Ashford, Washington · 13910 days ago · 9 km deep · 60 km away
  2. 1.71 km NNW of Elbe, Washington · 13908 days ago · 17 km deep · 45 km away
  3. 1.614 km SSE of Ashford, Washington · 13907 days ago · 6 km deep · 39 km away
  4. 1.93 km ESE of Packwood, Washington · 13903 days ago · 0 km deep · 55 km away
  5. 2.137 km SSE of Morton, Washington · 13902 days ago · 10 km deep · 20 km away
  6. 1.518 km SSE of Greenwater, Washington · 13901 days ago · 9 km deep · 87 km away
  7. 2.333 km NE of Amboy, Washington · 13879 days ago · 0 km deep · 27 km away
  8. 1.56 km NNE of Bonney Lake, Washington · 13877 days ago · 18 km deep · 96 km away
  9. 1.512 km WSW of Packwood, Washington · 13876 days ago · 7 km deep · 40 km away
  10. 1.738 km NNE of Amboy, Washington · 13870 days ago · 4 km deep · 20 km away
  11. 2.437 km NNE of Amboy, Washington · 13865 days ago · 0 km deep · 20 km away
  12. 1.88 km WSW of Packwood, Washington · 13865 days ago · 10 km deep · 43 km away
  13. 1.614 km SSE of Ashford, Washington · 13857 days ago · 8 km deep · 38 km away

Before

  1. 1.625 km N of Trout Lake, Washington · 13916 days ago · -1 km deep · 59 km away
  2. 1.638 km NNE of Amboy, Washington · 13917 days ago · 3 km deep · 20 km away
  3. 2.413 km NNE of Ashford, Washington · 13925 days ago · 10 km deep · 60 km away
  4. 1.512 km NE of Ashford, Washington · 13929 days ago · 9 km deep · 59 km away
  5. 3.012 km NE of Ashford, Washington · 13929 days ago · 10 km deep · 59 km away
  6. 1.613 km NE of Ashford, Washington · 13930 days ago · 9 km deep · 59 km away
  7. 1.72 km NE of Midland, Washington · 13932 days ago · 26 km deep · 91 km away
  8. 1.820 km NE of Ashford, Washington · 13933 days ago · 9 km deep · 66 km away
  9. 1.720 km NE of Ashford, Washington · 13933 days ago · 8 km deep · 66 km away
  10. 1.513 km NE of Ashford, Washington · 13936 days ago · 9 km deep · 59 km away
  11. 2.111 km NE of Ashford, Washington · 13937 days ago · 6 km deep · 58 km away
  12. 1.514 km NE of Ashford, Washington · 13941 days ago · 9 km deep · 60 km away
  13. 1.813 km NE of Ashford, Washington · 13942 days ago · 7 km deep · 59 km away
  14. 1.813 km NE of Ashford, Washington · 13943 days ago · 9 km deep · 59 km away
  15. 1.714 km NE of Ashford, Washington · 13943 days ago · 9 km deep · 60 km away
  16. 1.817 km NNE of Ashford, Washington · 13943 days ago · 4 km deep · 64 km away
  17. 1.914 km NE of Ashford, Washington · 13943 days ago · 9 km deep · 60 km away
  18. 1.914 km NE of Ashford, Washington · 13943 days ago · 9 km deep · 60 km away
  19. 3.813 km NE of Ashford, Washington · 13943 days ago · 10 km deep · 59 km away
  20. 2.014 km NE of Ashford, Washington · 13943 days ago · 8 km deep · 60 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10237768. Read Thu, Oct 1, 2026, 8:42 AM UTC.