Washington earthquakes

M1.8 earthquake 21 km S of Morton, Washington

A magnitude 1.8 earthquake struck 21 km S of Morton, Washington on Fri, Apr 9, 2004, 3:03 AM PDT (10:03 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M2.9 8 km E of Porter, Washington. This one was a foreshock.

Morton 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
2004-04-09 10:03:50 UTC
Depth
8.8 km (5.4 mi), shallow
Epicenter
46.365° N, 122.247° 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, 0.2 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
48°
Stations used
32

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 5 in the 30 days before it.

After

  1. 2.316 km SSE of Carbonado, Washington · 8206 days ago · 11 km deep · 67 km away
  2. 1.925 km S of Morton, Washington · 8206 days ago · 11 km deep · 4 km away
  3. 2.215 km SE of Mossyrock, Washington · 8205 days ago · 12 km deep · 10 km away
  4. 1.64 km ESE of Elbe, Washington · 8203 days ago · 16 km deep · 43 km away
  5. 1.92 km WNW of Ashford, Washington · 8198 days ago · 14 km deep · 47 km away
  6. 1.622 km N of Trout Lake, Washington · 8193 days ago · 0 km deep · 59 km away
  7. 1.72 km WSW of North Portland, Oregon · 8189 days ago · 13 km deep · 93 km away
  8. 2.12 km WNW of Saint Helens, Oregon · 8188 days ago · 21 km deep · 71 km away
  9. 2.98 km E of Porter, Washington · 8174 days ago · 41 km deep · 97 km away
  10. 1.82 km NE of Bucoda, Washington · 8171 days ago · 21 km deep · 68 km away
  11. 1.633 km SSE of Morton, Washington · 8160 days ago · 4 km deep · 17 km away
  12. 1.78 km E of Ashford, Washington · 8159 days ago · 3 km deep · 51 km away

Before

  1. 1.526 km SSE of Mossyrock, Washington · 8216 days ago · 19 km deep · 13 km away
  2. 1.825 km SSE of Mossyrock, Washington · 8216 days ago · 19 km deep · 12 km away
  3. 1.75 km NNW of Fern Prairie, Washington · 8221 days ago · 5 km deep · 78 km away
  4. 1.917 km SSE of Carbonado, Washington · 8233 days ago · -2 km deep · 66 km away
  5. 1.720 km S of Morton, Washington · 8238 days ago · 10 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10607298. Read Sat, Oct 3, 2026, 1:12 PM UTC.