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 20, 1982, 12:18 PM PDT (19:18 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M2.0 21 km S of Morton, 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
1982-09-20 19:18:58 UTC
Depth
9.5 km (5.9 mi), shallow
Epicenter
46.344° N, 122.248° 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, 0.6 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
78°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 1.517 km NW of Packwood, Washington · 16069 days ago · -1 km deep · 54 km away
  2. 1.725 km S of Morton, Washington · 16054 days ago · 8 km deep · 2 km away
  3. 2.021 km S of Morton, Washington · 16051 days ago · 10 km deep · 2 km away
  4. 1.922 km S of Morton, Washington · 16042 days ago · 6 km deep · 2 km away
  5. 1.538 km S of Morton, Washington · 16035 days ago · -2 km deep · 14 km away
  6. 1.539 km NNE of Amboy, Washington · 16035 days ago · -2 km deep · 16 km away
  7. 1.538 km NNE of Amboy, Washington · 16031 days ago · -1 km deep · 16 km away
  8. 1.92 km NE of Brush Prairie, Washington · 16029 days ago · 10 km deep · 69 km away
  9. 1.538 km NNE of Amboy, Washington · 16029 days ago · -2 km deep · 16 km away
  10. 1.638 km NNE of Amboy, Washington · 16029 days ago · -2 km deep · 16 km away
  11. 1.620 km NNE of Ashford, Washington · 16028 days ago · 3 km deep · 69 km away
  12. 1.838 km NNE of Amboy, Washington · 16025 days ago · -2 km deep · 16 km away
  13. 1.58 km ENE of Onalaska, Washington · 16024 days ago · 26 km deep · 42 km away
  14. 1.824 km S of Morton, Washington · 16019 days ago · 10 km deep · 0 km away
  15. 1.538 km NNE of Amboy, Washington · 16019 days ago · -2 km deep · 16 km away
  16. 1.813 km NNE of Ashford, Washington · 16018 days ago · 8 km deep · 62 km away
  17. 1.638 km NNE of Amboy, Washington · 16016 days ago · -2 km deep · 16 km away
  18. 1.931 km S of Morton, Washington · 16016 days ago · 9 km deep · 8 km away
  19. 1.638 km NNE of Amboy, Washington · 16015 days ago · -1 km deep · 16 km away

Before

  1. 1.936 km NNE of Amboy, Washington · 16075 days ago · -1 km deep · 17 km away
  2. 1.83 km NNE of Packwood, Washington · 16076 days ago · 4 km deep · 56 km away
  3. 1.612 km NE of Ashford, Washington · 16079 days ago · 9 km deep · 61 km away
  4. 2.222 km ESE of Packwood, Washington · 16087 days ago · 0 km deep · 70 km away
  5. 1.622 km S of Morton, Washington · 16089 days ago · 4 km deep · 1 km away
  6. 1.613 km NE of Ashford, Washington · 16089 days ago · 9 km deep · 62 km away
  7. 1.837 km SSE of Morton, Washington · 16090 days ago · 9 km deep · 16 km away
  8. 1.86 km S of Greenwater, Washington · 16091 days ago · 2 km deep · 95 km away
  9. 1.723 km ESE of Packwood, Washington · 16094 days ago · 2 km deep · 69 km away
  10. 1.916 km NNE of Ashford, Washington · 16095 days ago · 8 km deep · 65 km away
  11. 2.423 km ESE of Packwood, Washington · 16095 days ago · 0 km deep · 69 km away
  12. 1.525 km S of Morton, Washington · 16099 days ago · 8 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10145333. Read Tue, Sep 22, 2026, 8:34 AM UTC.