Washington earthquakes

M1.6 earthquake 15 km S of Morton, Washington

A magnitude 1.6 earthquake struck 15 km S of Morton, Washington on Sat, Aug 30, 2003, 1:50 PM PDT (20:50 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M2.4 3 km NW of North Portland, Oregon. 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
1.6 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
2003-08-30 20:50:44 UTC
Depth
7.3 km (4.5 mi), shallow
Epicenter
46.422° N, 122.250° 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 0.4 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.03
Depth from
From location
Station coverage gap
47°
Stations used
35

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.73 km ESE of Trout Lake, Washington · 8429 days ago · -1 km deep · 76 km away
  2. 2.43 km NW of North Portland, Oregon · 8427 days ago · 17 km deep · 95 km away
  3. 1.72 km NW of North Portland, Oregon · 8427 days ago · 16 km deep · 96 km away
  4. 1.538 km NNE of Amboy, Washington · 8422 days ago · 0 km deep · 25 km away
  5. 1.54 km SSE of La Center, Washington · 8420 days ago · 9 km deep · 73 km away
  6. 1.5Washington · 8412 days ago · 18 km deep · 36 km away
  7. 1.94 km WNW of North Portland, Oregon · 8408 days ago · 16 km deep · 96 km away
  8. 2.024 km E of Castle Rock, Washington · 8399 days ago · 18 km deep · 34 km away
  9. 1.727 km SW of White Swan, Washington · 8398 days ago · -1 km deep · 99 km away
  10. 1.710 km SSE of Mineral, Washington · 8395 days ago · 16 km deep · 25 km away
  11. 1.65 km WSW of Deer Island, Oregon · 8388 days ago · 22 km deep · 76 km away
  12. 1.543 km WNW of Trout Lake, Washington · 8382 days ago · 7 km deep · 32 km away
  13. 1.715 km SSW of Morton, Washington · 8380 days ago · 18 km deep · 7 km away

Before

  1. 1.512 km WSW of Greenwater, Washington · 8439 days ago · 5 km deep · 86 km away
  2. 1.811 km SSE of Mineral, Washington · 8445 days ago · 15 km deep · 24 km away
  3. 1.823 km ENE of Ashford, Washington · 8449 days ago · -2 km deep · 62 km away
  4. 2.28 km S of Morton, Washington · 8452 days ago · 17 km deep · 6 km away
  5. 1.710 km E of Kalama, Washington · 8458 days ago · 13 km deep · 58 km away
  6. 2.2Washington-Oregon border region · 8461 days ago · 17 km deep · 95 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10596543. Read Thu, Oct 1, 2026, 4:51 PM UTC.