Washington earthquakes

M1.5 earthquake 23 km E of Castle Rock, Washington

A magnitude 1.5 earthquake struck 23 km E of Castle Rock, Washington on Sun, Oct 13, 1985, 9:40 PM PDT (04:40 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M1.6 4 km SE of Packwood, 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
1.5 (md), micro
Local time
UTC
1985-10-14 04:40:05 UTC
Depth
19.2 km (11.9 mi), shallow
Epicenter
46.297° N, 122.599° 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, 0.4 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
64°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.64 km SE of Packwood, Washington · 14950 days ago · 0 km deep · 81 km away
  2. 2.138 km S of Morton, Washington · 14948 days ago · -2 km deep · 32 km away
  3. 1.810 km ESE of Ashford, Washington · 14942 days ago · 2 km deep · 71 km away
  4. 1.6Washington · 14937 days ago · 16 km deep · 29 km away
  5. 2.013 km NNW of Morton, Washington · 14932 days ago · 17 km deep · 44 km away
  6. 2.038 km S of Morton, Washington · 14930 days ago · -2 km deep · 33 km away
  7. 2.313 km NE of Ashford, Washington · 14929 days ago · 7 km deep · 81 km away
  8. 2.921 km S of Morton, Washington · 14918 days ago · 10 km deep · 28 km away
  9. 1.528 km NW of Carson, Washington · 14907 days ago · 11 km deep · 60 km away
  10. 2.112 km N of Mossyrock, Washington · 14898 days ago · 20 km deep · 39 km away

Before

  1. 1.611 km NNE of La Center, Washington · 14954 days ago · 8 km deep · 38 km away
  2. 1.5Washington · 14964 days ago · -1 km deep · 89 km away
  3. 2.117 km ESE of Carbonado, Washington · 14967 days ago · 16 km deep · 96 km away
  4. 1.637 km NNE of Amboy, Washington · 14970 days ago · -1 km deep · 34 km away
  5. 1.92 km NNE of Packwood, Washington · 14975 days ago · 3 km deep · 81 km away
  6. 1.639 km NNE of Amboy, Washington · 14982 days ago · -2 km deep · 34 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10200063. Read Tue, Sep 22, 2026, 5:28 AM UTC.