Washington earthquakes

M1.6 earthquake 20 km E of Castle Rock, Washington

A magnitude 1.6 earthquake struck 20 km E of Castle Rock, Washington on Mon, Jul 27, 2026, 4:04 AM PDT (11:04 UTC), 17 km (10 mi) below the surface.

A larger quake followed: M2.2 23 km ENE of Ashford, Washington. This one was a foreshock.

Castle Rock 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 (ml), micro
Local time
UTC
2026-07-27 11:04:09 UTC
Depth
16.9 km (10.5 mi), shallow
Epicenter
46.247° N, 122.640° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
46°
Stations used
78

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 21 since this one and 8 in the 30 days before it.

After

  1. 1.537 km NNE of Amboy, Washington · 55 days ago · 0 km deep · 36 km away
  2. 1.50 km NNW of Eatonville, Washington · 54 days ago · 0 km deep · 75 km away
  3. 2.223 km ENE of Ashford, Washington · 52 days ago · -1 km deep · 95 km away · felt by 1
  4. 2.337 km NNE of Amboy, Washington · 37 days ago · -2 km deep · 35 km away
  5. 1.68 km SW of Vernonia, Oregon · 33 days ago · 0 km deep · 70 km away
  6. 2.48 km E of Ashford, Washington · 31 days ago · 4 km deep · 79 km away · felt by 3
  7. 1.78 km E of Ashford, Washington · 31 days ago · 2 km deep · 79 km away
  8. 1.827 km N of Amboy, Washington · 29 days ago · 6 km deep · 16 km away
  9. 1.66 km NE of Rochester, Washington · 27 days ago · 6 km deep · 76 km away
  10. 1.520 km S of Packwood, Washington · 24 days ago · 4 km deep · 81 km away
  11. 1.68 km E of Ashford, Washington · 23 days ago · -1 km deep · 79 km away
  12. 1.632 km N of Amboy, Washington · 20 days ago · 10 km deep · 21 km away
  13. 3.820 km E of Castle Rock, Washington · 17 days ago · 18 km deep · 0 km away · felt by 1,025
  14. 1.57 km NNE of Ashford, Washington · 10 days ago · 8 km deep · 81 km away
  15. 1.720 km E of Castle Rock, Washington · 6 days ago · 17 km deep · 0 km away
  16. 2.010 km SSE of Scappoose, Oregon · 6 days ago · 23 km deep · 66 km away
  17. 1.511 km NE of Ashford, Washington · 5 days ago · 5 km deep · 85 km away
  18. 2.725 km ENE of Yacolt, Washington · 4 days ago · 9 km deep · 53 km away
  19. 1.537 km NNE of Amboy, Washington · 3 days ago · -2 km deep · 35 km away
  20. 1.55 km SSW of Morton, Washington · 47 hr ago · 10 km deep · 39 km away
  21. 1.718 km N of Amboy, Washington · 26 hr ago · 10 km deep · 25 km away

Before

  1. 1.638 km NE of Amboy, Washington · 60 days ago · 5 km deep · 37 km away
  2. 1.63 km S of Packwood, Washington · 60 days ago · 11 km deep · 83 km away
  3. 1.511 km ENE of East Cathlamet, Washington · 60 days ago · 1 km deep · 45 km away
  4. 1.69 km S of Mossyrock, Washington · 63 days ago · 19 km deep · 24 km away
  5. 1.938 km NE of Amboy, Washington · 66 days ago · 5 km deep · 37 km away
  6. 1.91 km SE of Vancouver, Washington · 67 days ago · 15 km deep · 69 km away · felt by 1
  7. 1.65 km SSW of Yacolt, Washington · 71 days ago · -1 km deep · 49 km away
  8. 1.511 km NNE of Ashford, Washington · 86 days ago · 10 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw714062841. Read Tue, Sep 22, 2026, 9:43 PM UTC.