Washington earthquakes

M1.8 earthquake 38 km SSE of Morton, Washington

A magnitude 1.8 earthquake struck 38 km SSE of Morton, Washington on Tue, Dec 31, 1991, 6:59 PM PST (02:59 UTC), 10 km (7 mi) below the surface.

A larger quake followed: M2.5 22 km ENE 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
1992-01-01 02:59:19 UTC
Depth
10.5 km (6.5 mi), shallow
Epicenter
46.253° N, 122.050° 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, 0.5 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
69°
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: 13 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.938 km SSE of Morton, Washington · 12688 days ago · 10 km deep · 0 km away
  2. 1.523 km NE of Ashford, Washington · 12685 days ago · -2 km deep · 73 km away
  3. 2.110 km SE of Mossyrock, Washington · 12679 days ago · 21 km deep · 35 km away
  4. 1.720 km ENE of Ashford, Washington · 12678 days ago · -1 km deep · 68 km away
  5. 1.524 km NE of Ashford, Washington · 12672 days ago · -2 km deep · 74 km away
  6. 2.522 km ENE of Ashford, Washington · 12660 days ago · -2 km deep · 71 km away
  7. 1.722 km ENE of Ashford, Washington · 12653 days ago · -2 km deep · 71 km away
  8. 1.628 km ENE of Ashford, Washington · 12650 days ago · -1 km deep · 75 km away
  9. 1.624 km ENE of Ashford, Washington · 12649 days ago · -1 km deep · 71 km away
  10. 1.827 km ENE of Ashford, Washington · 12644 days ago · -2 km deep · 73 km away
  11. 2.29 km S of Nile, Washington · 12642 days ago · 5 km deep · 100 km away
  12. 2.120 km ENE of Ashford, Washington · 12642 days ago · -2 km deep · 69 km away
  13. 1.924 km NE of Ashford, Washington · 12634 days ago · -2 km deep · 76 km away

Before

  1. 2.424 km ENE of Ashford, Washington · 12697 days ago · -2 km deep · 73 km away
  2. 1.728 km N of Packwood, Washington · 12698 days ago · -2 km deep · 74 km away
  3. 2.19 km NE of Ashford, Washington · 12700 days ago · 10 km deep · 63 km away
  4. 1.938 km SSE of Morton, Washington · 12702 days ago · 10 km deep · 0 km away
  5. 1.626 km ENE of Ashford, Washington · 12705 days ago · -2 km deep · 72 km away
  6. 1.738 km NNE of Amboy, Washington · 12705 days ago · 2 km deep · 12 km away
  7. 2.16 km W of Mineral, Washington · 12708 days ago · 14 km deep · 54 km away
  8. 1.724 km ENE of Ashford, Washington · 12711 days ago · -2 km deep · 71 km away
  9. 1.814 km NE of Ashford, Washington · 12712 days ago · 3 km deep · 68 km away
  10. 1.829 km SSE of Mossyrock, Washington · 12716 days ago · 6 km deep · 27 km away
  11. 1.722 km NE of Ashford, Washington · 12720 days ago · -1 km deep · 73 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10283518. Read Fri, Oct 2, 2026, 11:50 AM UTC.