Washington earthquakes

M1.9 earthquake 32 km E of Castle Rock, Washington

A magnitude 1.9 earthquake struck 32 km E of Castle Rock, Washington on Fri, Aug 10, 1973, 9:11 PM PDT (04:11 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M2.7 12 km S of Morton, Washington. This one was a foreshock.

Castle Rock forecastMore in Washington

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.9 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1973-08-11 04:11:47 UTC
Depth
19.1 km (11.9 mi), shallow
Epicenter
46.236° N, 122.494° 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 2.2 km horizontally, 2.8 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
225°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 1.913 km ENE of Ashford, Washington · 19400 days ago · 8 km deep · 79 km away
  2. 2.712 km S of Morton, Washington · 19396 days ago · 11 km deep · 30 km away
  3. 1.827 km NNE of Amboy, Washington · 19390 days ago · 10 km deep · 14 km away
  4. 2.438 km NNE of Amboy, Washington · 19386 days ago · 8 km deep · 23 km away
  5. 1.910 km NNW of Packwood, Washington · 19381 days ago · 2 km deep · 77 km away
  6. 1.99 km SSE of Mossyrock, Washington · 19380 days ago · 9 km deep · 24 km away
  7. 2.212 km SSE of Mossyrock, Washington · 19377 days ago · 11 km deep · 22 km away
  8. 2.214 km NNE of Ashford, Washington · 19367 days ago · 7 km deep · 83 km away
  9. 1.616 km ESE of Ashford, Washington · 19358 days ago · 11 km deep · 73 km away

Before

  1. 2.917 km ENE of Ashford, Washington · 19434 days ago · 7 km deep · 83 km away
  2. 2.417 km ENE of Ashford, Washington · 19434 days ago · 10 km deep · 84 km away
  3. 3.917 km ENE of Ashford, Washington · 19434 days ago · 6 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10856718. Read Sat, Oct 3, 2026, 1:57 AM UTC.