Washington earthquakes

M1.5 earthquake 29 km S of Mossyrock, Washington

A magnitude 1.5 earthquake struck 29 km S of Mossyrock, Washington on Mon, Oct 15, 1984, 5:11 PM PDT (00:11 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M3.1 24 km NE of Ashford, 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
1.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1984-10-16 00:11:24 UTC
Depth
14.8 km (9.2 mi), shallow
Epicenter
46.264° N, 122.455° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
69°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 1.738 km NNE of Amboy, Washington · 15325 days ago · -2 km deep · 21 km away
  2. 2.06 km E of Ashford, Washington · 15324 days ago · 5 km deep · 67 km away
  3. 1.541 km SSE of Morton, Washington · 15323 days ago · 9 km deep · 36 km away
  4. 1.638 km NNE of Amboy, Washington · 15322 days ago · -2 km deep · 22 km away
  5. 1.537 km SSE of Morton, Washington · 15322 days ago · 9 km deep · 26 km away
  6. 2.015 km SSW of Clatskanie, Oregon · 15321 days ago · 54 km deep · 73 km away
  7. 1.538 km NNE of Amboy, Washington · 15320 days ago · -2 km deep · 22 km away
  8. 1.937 km S of Morton, Washington · 15312 days ago · 0 km deep · 21 km away
  9. 1.625 km ENE of Yacolt, Washington · 15308 days ago · 6 km deep · 41 km away
  10. 2.237 km S of Morton, Washington · 15308 days ago · 0 km deep · 21 km away
  11. 1.922 km S of Morton, Washington · 15308 days ago · 10 km deep · 18 km away
  12. 1.520 km NE of Ashford, Washington · 15305 days ago · 6 km deep · 85 km away
  13. 1.838 km NNE of Amboy, Washington · 15304 days ago · -2 km deep · 22 km away
  14. 1.610 km ENE of Ashford, Washington · 15300 days ago · 11 km deep · 72 km away
  15. 1.738 km NNE of Amboy, Washington · 15296 days ago · -2 km deep · 22 km away
  16. 3.124 km NE of Ashford, Washington · 15294 days ago · 0 km deep · 88 km away
  17. 1.55 km ESE of Mossyrock, Washington · 15293 days ago · 20 km deep · 28 km away
  18. 1.738 km NNE of Amboy, Washington · 15292 days ago · -2 km deep · 21 km away
  19. 2.438 km NNE of Amboy, Washington · 15292 days ago · -2 km deep · 21 km away
  20. 1.815 km NNE of Ashford, Washington · 15281 days ago · 7 km deep · 79 km away
  21. 1.76 km SSW of Morton, Washington · 15276 days ago · 19 km deep · 29 km away
  22. 2.51 km SSE of Beaverton, Oregon · 15269 days ago · 25 km deep · 91 km away

Before

  1. 2.138 km NNE of Amboy, Washington · 15330 days ago · -2 km deep · 21 km away
  2. 1.95 km ESE of Packwood, Washington · 15334 days ago · 2 km deep · 76 km away
  3. 1.525 km S of Morton, Washington · 15335 days ago · 8 km deep · 18 km away
  4. 2.338 km NNE of Amboy, Washington · 15338 days ago · -2 km deep · 21 km away
  5. 1.837 km NNE of Amboy, Washington · 15340 days ago · 1 km deep · 23 km away
  6. 2.13 km S of South Prairie, Washington · 15347 days ago · 7 km deep · 98 km away
  7. 2.037 km NNE of Amboy, Washington · 15350 days ago · -1 km deep · 21 km away
  8. 2.17 km E of Kapowsin, Washington · 15354 days ago · 19 km deep · 84 km away
  9. 1.96 km NNE of Packwood, Washington · 15355 days ago · 6 km deep · 76 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10182613. Read Thu, Oct 1, 2026, 2:40 PM UTC.