Washington earthquakes

M1.5 earthquake 4 km NE of Anacortes, Washington

A magnitude 1.5 earthquake struck 4 km NE of Anacortes, Washington on Mon, Aug 23, 2004, 2:33 AM PDT (09:33 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M3.1 4 km NNE of Jamestown, Washington. This one was a foreshock.

Anacortes 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
2004-08-23 09:33:35 UTC
Depth
15.6 km (9.7 mi), shallow
Epicenter
48.545° N, 122.577° 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 1.1 km horizontally, 4.0 km in depth
Magnitude uncertainty
±0.05
Depth from
Operator assigned
Station coverage gap
77°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 2.44 km NNE of Anacortes, Washington · 8075 days ago · 15 km deep · 0 km away
  2. 2.03 km NE of Anacortes, Washington · 8075 days ago · 17 km deep · 1 km away
  3. 1.5Washington · 8075 days ago · 7 km deep · 1 km away
  4. 1.7British Columbia, Canada · 8071 days ago · 1 km deep · 69 km away
  5. 1.97 km ENE of Coquitlam, Canada · 8070 days ago · 3 km deep · 85 km away
  6. 1.51 km NNW of Silvana, Washington · 8070 days ago · 8 km deep · 44 km away
  7. 1.59 km WSW of Port Ludlow, Washington · 8063 days ago · 26 km deep · 74 km away
  8. 1.65 km SE of Oso, Washington · 8059 days ago · 12 km deep · 63 km away
  9. 1.717 km W of Richmond, Canada · 8059 days ago · 0 km deep · 90 km away
  10. 1.92 km SE of Sudden Valley, Washington · 8058 days ago · 20 km deep · 26 km away
  11. 2.27 km SSE of Maple Falls, Washington · 8057 days ago · -1 km deep · 52 km away
  12. 1.96 km ENE of Acme, Washington · 8048 days ago · 14 km deep · 39 km away
  13. 3.14 km NNE of Jamestown, Washington · 8043 days ago · 16 km deep · 56 km away
  14. 1.623 km WNW of Brinnon, Washington · 8043 days ago · 42 km deep · 100 km away
  15. 1.58 km SW of Camano, Washington · 8035 days ago · 26 km deep · 47 km away
  16. 1.52 km ESE of Sudden Valley, Washington · 8034 days ago · 19 km deep · 27 km away
  17. 1.75 km ENE of Granite Falls, Washington · 8031 days ago · -1 km deep · 71 km away
  18. 1.64 km SE of Oso, Washington · 8030 days ago · 12 km deep · 61 km away

Before

  1. 2.12 km E of Edmonds, Washington · 8077 days ago · 31 km deep · 84 km away
  2. 1.91 km WNW of Swede Heaven, Washington · 8078 days ago · 7 km deep · 67 km away
  3. 1.65 km SSE of Swede Heaven, Washington · 8078 days ago · 9 km deep · 74 km away
  4. 1.73 km NNW of Sumas, Washington · 8079 days ago · 0 km deep · 58 km away
  5. 1.86 km W of Orcas, Washington · 8079 days ago · 13 km deep · 34 km away
  6. 1.5British Columbia, Canada · 8082 days ago · 24 km deep · 76 km away
  7. 1.51 km NE of Lyman, Washington · 8086 days ago · 1 km deep · 39 km away
  8. 2.318 km E of Verlot, Washington · 8086 days ago · 4 km deep · 94 km away
  9. 1.614 km SSW of Chilliwack, Canada · 8088 days ago · -1 km deep · 69 km away
  10. 1.51 km W of Silvana, Washington · 8089 days ago · 7 km deep · 44 km away
  11. 2.57 km NW of Quilcene, Washington · 8094 days ago · 18 km deep · 81 km away
  12. 1.63 km ESE of Oso, Washington · 8098 days ago · 13 km deep · 60 km away
  13. 1.61 km N of Darrington, Washington · 8100 days ago · 11 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10615243. Read Fri, Oct 2, 2026, 3:51 AM UTC.