Washington earthquakes

M1.8 earthquake 23 km S of Morton, Washington

A magnitude 1.8 earthquake struck 23 km S of Morton, Washington on Mon, Sep 28, 1981, 5:38 PM PDT (00:38 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M2.6 24 km ESE of Packwood, 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), micro
Local time
UTC
1981-09-29 00:38:07 UTC
Depth
7.6 km (4.7 mi), shallow
Epicenter
46.345° N, 122.243° 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, 0.6 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
53°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 2.624 km ESE of Packwood, Washington · 16421 days ago · 3 km deep · 69 km away
  2. 1.95 km SSE of Mineral, Washington · 16414 days ago · 19 km deep · 37 km away
  3. 1.625 km ESE of Packwood, Washington · 16408 days ago · 0 km deep · 72 km away
  4. 1.638 km NNE of Amboy, Washington · 16404 days ago · 1 km deep · 15 km away
  5. 2.21 km NE of White Salmon, Washington · 16398 days ago · 3 km deep · 90 km away
  6. 2.55 km SSE of Mill Plain, Washington · 16389 days ago · 6 km deep · 85 km away
  7. 1.720 km S of Morton, Washington · 16388 days ago · 8 km deep · 4 km away
  8. 1.78 km SE of Mineral, Washington · 16381 days ago · 18 km deep · 35 km away
  9. 1.923 km ESE of Packwood, Washington · 16378 days ago · 4 km deep · 68 km away
  10. 1.53 km NE of East Cathlamet, Washington · 16374 days ago · 21 km deep · 85 km away
  11. 1.525 km ENE of Ashford, Washington · 16371 days ago · -1 km deep · 69 km away

Before

  1. 1.517 km NW of Trout Lake, Washington · 16429 days ago · 3 km deep · 51 km away
  2. 1.62 km SSW of Parkland, Washington · 16443 days ago · 53 km deep · 89 km away
  3. 1.518 km NNE of Ashford, Washington · 16445 days ago · 9 km deep · 68 km away
  4. 2.423 km ESE of Packwood, Washington · 16448 days ago · -1 km deep · 68 km away
  5. 1.623 km ESE of Packwood, Washington · 16448 days ago · -1 km deep · 68 km away
  6. 2.024 km ESE of Packwood, Washington · 16448 days ago · 3 km deep · 69 km away
  7. 1.521 km NE of Ashford, Washington · 16451 days ago · 6 km deep · 69 km away
  8. 1.938 km NNE of Amboy, Washington · 16451 days ago · -1 km deep · 16 km away
  9. 1.637 km NNE of Amboy, Washington · 16451 days ago · -1 km deep · 17 km away
  10. 1.638 km NNE of Amboy, Washington · 16453 days ago · 0 km deep · 16 km away
  11. 1.938 km NNE of Amboy, Washington · 16455 days ago · -1 km deep · 16 km away
  12. 1.724 km S of Morton, Washington · 16455 days ago · 3 km deep · 2 km away
  13. 1.924 km S of Morton, Washington · 16455 days ago · 3 km deep · 2 km away
  14. 1.56 km S of Morton, Washington · 16456 days ago · 4 km deep · 18 km away
  15. 1.638 km NNE of Amboy, Washington · 16456 days ago · 0 km deep · 16 km away
  16. 1.838 km NNE of Amboy, Washington · 16457 days ago · 0 km deep · 16 km away
  17. 1.524 km ENE of Ashford, Washington · 16458 days ago · -1 km deep · 68 km away
  18. 1.637 km NNE of Amboy, Washington · 16459 days ago · 1 km deep · 16 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10119943. Read Tue, Sep 22, 2026, 4:15 AM UTC.