Washington earthquakes

M1.8 earthquake 13 km NNW of Mossyrock, Washington

A magnitude 1.8 earthquake struck 13 km NNW of Mossyrock, Washington on Sat, Oct 11, 1975, 3:39 PM PDT (22:39 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.2 13 km NNW of Mossyrock, Washington. This one was a foreshock.

Mossyrock 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
1975-10-11 22:39:14 UTC
Depth
-0.9 km (-0.6 mi), shallow
Epicenter
46.647° N, 122.548° 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 0.1 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
96°
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 2.213 km NNW of Mossyrock, Washington · 18608 days ago · 13 km deep · 1 km away
  2. 1.913 km SSE of Pe Ell, Washington · 18606 days ago · -1 km deep · 57 km away
  3. 2.218 km N of Mossyrock, Washington · 18598 days ago · 2 km deep · 6 km away
  4. 1.713 km WSW of Alder, Washington · 18598 days ago · -1 km deep · 13 km away
  5. 1.96 km SW of Morton, Washington · 18591 days ago · 11 km deep · 21 km away
  6. 2.52 km NNE of Riverton, Washington · 18576 days ago · 27 km deep · 97 km away
  7. 1.52 km SW of Burley, Washington · 18572 days ago · 19 km deep · 85 km away
  8. 1.96 km ESE of Maplewood, Washington · 18566 days ago · 16 km deep · 81 km away
  9. 2.11 km WSW of Gig Harbor, Washington · 18561 days ago · 33 km deep · 75 km away

Before

  1. 3.227 km NE of Amboy, Washington · 18609 days ago · 23 km deep · 65 km away
  2. 2.642 km SSE of Morton, Washington · 18609 days ago · 9 km deep · 61 km away
  3. 2.727 km S of Morton, Washington · 18612 days ago · 11 km deep · 43 km away
  4. 2.024 km S of Morton, Washington · 18625 days ago · -1 km deep · 41 km away
  5. 1.724 km SE of Greenwater, Washington · 18627 days ago · 8 km deep · 90 km away
  6. 1.911 km W of Packwood, Washington · 18629 days ago · 4 km deep · 56 km away
  7. 1.74 km NNE of Ravensdale, Washington · 18632 days ago · 7 km deep · 94 km away
  8. 1.711 km NNW of Skamokawa Valley, Washington · 18633 days ago · 0 km deep · 72 km away
  9. 2.024 km S of Morton, Washington · 18633 days ago · 7 km deep · 42 km away
  10. 2.925 km S of Morton, Washington · 18633 days ago · 9 km deep · 41 km away
  11. 1.51 km NNW of Tukwila, Washington · 18634 days ago · 23 km deep · 96 km away
  12. 1.923 km SE of Greenwater, Washington · 18635 days ago · 2 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10862003. Read Tue, Sep 22, 2026, 7:24 AM UTC.