Washington earthquakes

M2.0 earthquake 6 km N of Mossyrock, Washington

A magnitude 2.0 earthquake struck 6 km N of Mossyrock, Washington on Sat, Sep 17, 1977, 11:24 AM PDT (18:24 UTC), 23 km (14 mi) below the surface.

A larger quake followed: M2.1 8 km NNE 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
2.0 (md), micro
Local time
UTC
1977-09-17 18:24:03 UTC
Depth
23.0 km (14.3 mi), shallow
Epicenter
46.590° N, 122.476° 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 0.9 km horizontally, 2.8 km in depth
Depth from
From location
Station coverage gap
100°
Stations used
11

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 8 in the 30 days before it.

After

  1. 2.18 km NNE of Mossyrock, Washington · 17901 days ago · 20 km deep · 2 km away
  2. 1.63 km NE of Bonney Lake, Washington · 17897 days ago · 15 km deep · 72 km away
  3. 1.915 km NNE of Ashford, Washington · 17894 days ago · 4 km deep · 52 km away
  4. 1.914 km E of Wilkeson, Washington · 17890 days ago · 7 km deep · 74 km away
  5. 2.122 km N of Carson, Washington · 17888 days ago · -1 km deep · 90 km away
  6. 1.511 km SSE of Pe Ell, Washington · 17885 days ago · 28 km deep · 62 km away
  7. 2.216 km ENE of Yacolt, Washington · 17883 days ago · -1 km deep · 79 km away
  8. 1.740 km SSE of Morton, Washington · 17878 days ago · 3 km deep · 51 km away
  9. 1.625 km ENE of Ashford, Washington · 17872 days ago · 0 km deep · 64 km away
  10. 1.62 km W of Burley, Washington · 17853 days ago · 21 km deep · 93 km away
  11. 1.92 km WSW of Ashford, Washington · 17846 days ago · 0 km deep · 36 km away
  12. 1.92 km SW of Ashford, Washington · 17846 days ago · -1 km deep · 37 km away

Before

  1. 2.115 km NNE of Ashford, Washington · 17910 days ago · -1 km deep · 52 km away
  2. 3.46 km SSE of Bucoda, Washington · 17912 days ago · 6 km deep · 32 km away
  3. 1.74 km NW of Federal Way, Washington · 17914 days ago · 22 km deep · 85 km away
  4. 1.811 km W of Packwood, Washington · 17922 days ago · -1 km deep · 50 km away
  5. 1.912 km NE of East Cathlamet, Washington · 17922 days ago · 23 km deep · 69 km away
  6. 1.939 km SE of Morton, Washington · 17923 days ago · -1 km deep · 53 km away
  7. 1.515 km NNE of Ashford, Washington · 17925 days ago · 15 km deep · 52 km away
  8. 1.917 km SE of Carbonado, Washington · 17925 days ago · 9 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10844718. Read Tue, Sep 22, 2026, 9:21 PM UTC.