Washington earthquakes

M2.2 earthquake 13 km NNW of Mossyrock, Washington

A magnitude 2.2 earthquake struck 13 km NNW of Mossyrock, Washington on Sat, Oct 11, 1975, 11:27 PM PDT (06:27 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M2.5 2 km NNE of Riverton, 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
2.2 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1975-10-12 06:27:25 UTC
Depth
13.5 km (8.4 mi), shallow
Epicenter
46.639° N, 122.557° 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 0.0 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
187°, poorly surrounded by stations
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 1.913 km SSE of Pe Ell, Washington · 18619 days ago · -1 km deep · 56 km away
  2. 2.218 km N of Mossyrock, Washington · 18611 days ago · 2 km deep · 7 km away
  3. 1.713 km WSW of Alder, Washington · 18610 days ago · -1 km deep · 14 km away
  4. 1.96 km SW of Morton, Washington · 18604 days ago · 11 km deep · 21 km away
  5. 2.52 km NNE of Riverton, Washington · 18589 days ago · 27 km deep · 98 km away
  6. 1.52 km SW of Burley, Washington · 18585 days ago · 19 km deep · 86 km away
  7. 1.96 km ESE of Maplewood, Washington · 18579 days ago · 16 km deep · 82 km away
  8. 2.11 km WSW of Gig Harbor, Washington · 18574 days ago · 33 km deep · 76 km away

Before

  1. 1.813 km NNW of Mossyrock, Washington · 18621 days ago · -1 km deep · 1 km away
  2. 3.227 km NE of Amboy, Washington · 18621 days ago · 23 km deep · 65 km away
  3. 2.642 km SSE of Morton, Washington · 18622 days ago · 9 km deep · 60 km away
  4. 2.727 km S of Morton, Washington · 18625 days ago · 11 km deep · 43 km away
  5. 2.024 km S of Morton, Washington · 18638 days ago · -1 km deep · 40 km away
  6. 1.724 km SE of Greenwater, Washington · 18640 days ago · 8 km deep · 91 km away
  7. 1.911 km W of Packwood, Washington · 18642 days ago · 4 km deep · 57 km away
  8. 1.74 km NNE of Ravensdale, Washington · 18645 days ago · 7 km deep · 95 km away
  9. 1.711 km NNW of Skamokawa Valley, Washington · 18645 days ago · 0 km deep · 72 km away
  10. 2.024 km S of Morton, Washington · 18645 days ago · 7 km deep · 42 km away
  11. 2.925 km S of Morton, Washington · 18646 days ago · 9 km deep · 41 km away
  12. 1.51 km NNW of Tukwila, Washington · 18647 days ago · 23 km deep · 97 km away
  13. 1.923 km SE of Greenwater, Washington · 18648 days ago · 2 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10862008. Read Sun, Oct 4, 2026, 11:50 PM UTC.