Washington earthquakes

M1.5 earthquake 3 km NW of Chico, Washington

A magnitude 1.5 earthquake struck 3 km NW of Chico, Washington on Wed, Aug 13, 1975, 2:40 AM PDT (09:40 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M1.7 4 km NW of Oso, Washington. This one was a foreshock.

Chico 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), micro
Local time
UTC
1975-08-13 09:40:27 UTC
Depth
8.3 km (5.2 mi), shallow
Epicenter
47.635° N, 122.735° 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, 0.9 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
104°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 41 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 1.74 km NW of Oso, Washington · 18668 days ago · 8 km deep · 93 km away
  2. 1.59 km SSW of Seabeck, Washington · 18666 days ago · 14 km deep · 14 km away
  3. 1.915 km SSW of Blyn, Washington · 18660 days ago · 39 km deep · 42 km away
  4. 2.42 km W of Fall City, Washington · 18659 days ago · 5 km deep · 62 km away
  5. 2.22 km N of Union Hill-Novelty Hill, Washington · 18659 days ago · 18 km deep · 53 km away
  6. 3.06 km N of Olympia, Washington · 18657 days ago · 43 km deep · 61 km away
  7. 2.04 km WSW of Snoqualmie, Washington · 18656 days ago · 22 km deep · 66 km away
  8. 2.36 km E of Marrowstone, Washington · 18656 days ago · 24 km deep · 47 km away
  9. 2.36 km SSE of Baring, Washington · 18656 days ago · 15 km deep · 96 km away
  10. 2.14 km NE of Carnation, Washington · 18655 days ago · 9 km deep · 65 km away
  11. 2.02 km SW of Snoqualmie, Washington · 18654 days ago · -1 km deep · 68 km away
  12. 1.613 km NNE of Greenwater, Washington · 18653 days ago · 16 km deep · 94 km away
  13. 2.53 km N of Kingston, Washington · 18651 days ago · 23 km deep · 28 km away
  14. 2.24 km SSW of Snoqualmie, Washington · 18649 days ago · 14 km deep · 69 km away
  15. 2.61 km WNW of Crocker, Washington · 18648 days ago · 7 km deep · 76 km away
  16. 2.81 km NNE of Ravensdale, Washington · 18647 days ago · -1 km deep · 65 km away
  17. 2.68 km W of Gorst, Washington · 18645 days ago · 21 km deep · 13 km away
  18. 2.61 km WNW of Mirrormont, Washington · 18642 days ago · 11 km deep · 58 km away
  19. 2.02 km SW of Lake Forest Park, Washington · 18641 days ago · 14 km deep · 35 km away
  20. 1.92 km WNW of Bryn Mawr-Skyway, Washington · 18641 days ago · 24 km deep · 38 km away
  21. 2.00 km NNE of Bellevue, Washington · 18640 days ago · 16 km deep · 40 km away
  22. 2.03 km WSW of Woodway, Washington · 18640 days ago · 11 km deep · 29 km away
  23. 1.83 km SSE of La Conner, Washington · 18638 days ago · -1 km deep · 83 km away
  24. 2.56 km WSW of Lake Cavanaugh, Washington · 18636 days ago · 3 km deep · 88 km away
  25. 1.98 km W of Snoqualmie Pass, Washington · 18635 days ago · 12 km deep · 96 km away
  26. 1.51 km NNW of Tukwila, Washington · 18635 days ago · 23 km deep · 39 km away
  27. 2.66 km WSW of Lake Cavanaugh, Washington · 18635 days ago · 7 km deep · 88 km away
  28. 2.06 km SW of Lake Cavanaugh, Washington · 18635 days ago · 11 km deep · 87 km away
  29. 1.96 km WSW of Lake Cavanaugh, Washington · 18633 days ago · 9 km deep · 88 km away
  30. 1.74 km NNE of Ravensdale, Washington · 18633 days ago · 7 km deep · 65 km away
  31. 1.91 km NW of Mill Creek, Washington · 18633 days ago · 24 km deep · 47 km away
  32. 2.16 km WSW of Lake Cavanaugh, Washington · 18630 days ago · 2 km deep · 88 km away
  33. 3.56 km SW of Clinton, Washington · 18625 days ago · 26 km deep · 42 km away
  34. 2.56 km SE of Oak Harbor, Washington · 18623 days ago · 17 km deep · 69 km away
  35. 1.65 km SE of Oak Harbor, Washington · 18621 days ago · 17 km deep · 70 km away
  36. 2.112 km SE of Verlot, Washington · 18621 days ago · 5 km deep · 93 km away
  37. 2.015 km ESE of Verlot, Washington · 18620 days ago · 19 km deep · 96 km away
  38. 1.92 km ESE of Tanner, Washington · 18616 days ago · 5 km deep · 79 km away
  39. 2.50 km NNE of Erlands Point-Kitsap Lake, Washington · 18614 days ago · 19 km deep · 5 km away
  40. 3.13 km SE of Lake Roesiger, Washington · 18614 days ago · 17 km deep · 72 km away
  41. 2.83 km SSE of Lake Roesiger, Washington · 18612 days ago · 13 km deep · 71 km away

Before

  1. 1.83 km E of Keyport, Washington · 18669 days ago · 15 km deep · 14 km away
  2. 1.93 km E of Keyport, Washington · 18669 days ago · 14 km deep · 14 km away
  3. 1.87 km NE of Brinnon, Washington · 18669 days ago · 14 km deep · 13 km away
  4. 1.82 km ESE of Silverdale, Washington · 18676 days ago · 21 km deep · 5 km away
  5. 1.82 km NNE of Bay View, Washington · 18679 days ago · 24 km deep · 99 km away
  6. 3.42 km NE of Dash Point, Washington · 18688 days ago · 7 km deep · 42 km away
  7. 1.84 km SSE of Monroe, Washington · 18693 days ago · 12 km deep · 62 km away
  8. 2.22 km S of Startup, Washington · 18693 days ago · -1 km deep · 78 km away
  9. 1.92 km ENE of Dash Point, Washington · 18698 days ago · 8 km deep · 42 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10861448. Read Tue, Sep 22, 2026, 9:18 PM UTC.