Washington earthquakes

M1.9 earthquake 11 km W of Packwood, Washington

A magnitude 1.9 earthquake struck 11 km W of Packwood, Washington on Sat, Sep 20, 1975, 5:59 PM PDT (00:59 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.2 27 km NE 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
1.9 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1975-09-21 00:59:35 UTC
Depth
3.8 km (2.3 mi), shallow
Epicenter
46.599° N, 121.816° 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 1.8 km horizontally, 1.3 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
199°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 15 in the 30 days before it.

After

  1. 1.724 km SE of Greenwater, Washington · 18640 days ago · 8 km deep · 49 km away
  2. 2.024 km S of Morton, Washington · 18638 days ago · -1 km deep · 45 km away
  3. 1.83 km WNW of Snoqualmie Pass, Washington · 18635 days ago · 4 km deep · 94 km away
  4. 1.92 km ESE of Tanner, Washington · 18628 days ago · 5 km deep · 97 km away
  5. 2.727 km S of Morton, Washington · 18625 days ago · 11 km deep · 46 km away
  6. 2.642 km SSE of Morton, Washington · 18622 days ago · 9 km deep · 49 km away
  7. 3.227 km NE of Amboy, Washington · 18621 days ago · 23 km deep · 64 km away
  8. 1.813 km NNW of Mossyrock, Washington · 18621 days ago · -1 km deep · 56 km away
  9. 2.213 km NNW of Mossyrock, Washington · 18621 days ago · 13 km deep · 57 km away
  10. 2.218 km N of Mossyrock, Washington · 18611 days ago · 2 km deep · 53 km away
  11. 1.713 km WSW of Alder, Washington · 18611 days ago · -1 km deep · 51 km away
  12. 1.96 km SW of Morton, Washington · 18604 days ago · 11 km deep · 41 km away

Before

  1. 1.74 km NNE of Ravensdale, Washington · 18645 days ago · 7 km deep · 88 km away
  2. 2.024 km S of Morton, Washington · 18646 days ago · 7 km deep · 44 km away
  3. 2.925 km S of Morton, Washington · 18646 days ago · 9 km deep · 46 km away
  4. 1.98 km W of Snoqualmie Pass, Washington · 18647 days ago · 12 km deep · 91 km away
  5. 1.923 km SE of Greenwater, Washington · 18648 days ago · 2 km deep · 53 km away
  6. 2.61 km WNW of Mirrormont, Washington · 18655 days ago · 11 km deep · 98 km away
  7. 2.18 km E of Snoqualmie Pass, Washington · 18656 days ago · 0 km deep · 96 km away
  8. 2.425 km SSE of Morton, Washington · 18659 days ago · 8 km deep · 39 km away
  9. 2.81 km NNE of Ravensdale, Washington · 18659 days ago · -1 km deep · 86 km away
  10. 2.038 km SSE of Morton, Washington · 18660 days ago · 4 km deep · 48 km away
  11. 2.61 km WNW of Crocker, Washington · 18661 days ago · 7 km deep · 59 km away
  12. 2.24 km SSW of Snoqualmie, Washington · 18661 days ago · 14 km deep · 99 km away
  13. 2.213 km NNE of Amboy, Washington · 18662 days ago · 5 km deep · 77 km away
  14. 1.613 km NNE of Greenwater, Washington · 18665 days ago · 16 km deep · 77 km away
  15. 3.06 km N of Olympia, Washington · 18670 days ago · 43 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10861848. Read Mon, Oct 5, 2026, 6:19 AM UTC.