Washington earthquakes

M1.8 earthquake 25 km SSE of Mossyrock, Washington

A magnitude 1.8 earthquake struck 25 km SSE of Mossyrock, Washington on Mon, Apr 5, 2004, 3:36 PM PDT (22:36 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M2.9 8 km E of Porter, 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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
2004-04-05 22:36:12 UTC
Depth
18.6 km (11.6 mi), shallow
Epicenter
46.307° N, 122.383° 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 0.5 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.03
Depth from
From location
Station coverage gap
84°
Stations used
26

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 1.526 km SSE of Mossyrock, Washington · 8214 days ago · 19 km deep · 0 km away
  2. 1.821 km S of Morton, Washington · 8211 days ago · 9 km deep · 12 km away
  3. 2.316 km SSE of Carbonado, Washington · 8205 days ago · 11 km deep · 77 km away
  4. 1.925 km S of Morton, Washington · 8204 days ago · 11 km deep · 11 km away
  5. 2.215 km SE of Mossyrock, Washington · 8203 days ago · 12 km deep · 13 km away
  6. 1.64 km ESE of Elbe, Washington · 8202 days ago · 16 km deep · 52 km away
  7. 1.92 km WNW of Ashford, Washington · 8197 days ago · 14 km deep · 57 km away
  8. 1.622 km N of Trout Lake, Washington · 8191 days ago · 0 km deep · 67 km away
  9. 1.72 km WSW of North Portland, Oregon · 8188 days ago · 13 km deep · 83 km away
  10. 2.12 km WNW of Saint Helens, Oregon · 8187 days ago · 21 km deep · 60 km away
  11. 2.98 km E of Porter, Washington · 8173 days ago · 41 km deep · 94 km away
  12. 1.82 km NE of Bucoda, Washington · 8170 days ago · 21 km deep · 67 km away
  13. 1.633 km SSE of Morton, Washington · 8158 days ago · 4 km deep · 26 km away
  14. 1.78 km E of Ashford, Washington · 8157 days ago · 3 km deep · 62 km away

Before

  1. 1.75 km NNW of Fern Prairie, Washington · 8219 days ago · 5 km deep · 70 km away
  2. 1.917 km SSE of Carbonado, Washington · 8231 days ago · -2 km deep · 76 km away
  3. 1.720 km S of Morton, Washington · 8237 days ago · 10 km deep · 12 km away
  4. 1.513 km ESE of Pe Ell, Washington · 8244 days ago · 51 km deep · 63 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10606178. Read Fri, Oct 2, 2026, 1:37 AM UTC.