Washington earthquakes

M1.8 earthquake 5 km W of Entiat, Washington

A magnitude 1.8 earthquake struck 5 km W of Entiat, Washington on Fri, Apr 22, 1977, 10:31 AM PST (18:31 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.4 20 km NNE of Index, Washington. This one was a foreshock.

Entiat 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
1.8 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1977-04-22 18:31:27 UTC
Depth
-0.3 km (-0.2 mi), shallow
Epicenter
47.669° N, 120.276° 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 0.7 km horizontally
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
203°, poorly surrounded by stations
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: 12 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 1.77 km SE of Rock Island, Washington · 18052 days ago · 0 km deep · 41 km away
  2. 1.55 km SSW of Chelan Falls, Washington · 18045 days ago · 4 km deep · 22 km away
  3. 2.10 km SW of Waterville, Washington · 18044 days ago · 0 km deep · 15 km away
  4. 2.0Washington · 18042 days ago · 0 km deep · 7 km away
  5. 1.64 km NW of Waterville, Washington · 18040 days ago · 0 km deep · 11 km away
  6. 2.112 km SSW of Kittitas, Washington · 18038 days ago · 13 km deep · 88 km away
  7. 1.510 km WSW of Entiat, Washington · 18035 days ago · 0 km deep · 5 km away
  8. 1.78 km SSW of Chelan Falls, Washington · 18029 days ago · 3 km deep · 20 km away
  9. 1.712 km W of Entiat, Washington · 18025 days ago · 0 km deep · 8 km away
  10. 2.420 km NNE of Index, Washington · 18014 days ago · 4 km deep · 96 km away
  11. 1.70 km SSW of Entiat, Washington · 18009 days ago · 0 km deep · 5 km away
  12. 2.37 km N of Quincy, Washington · 18002 days ago · 0 km deep · 51 km away

Before

  1. 1.94 km SE of Entiat, Washington · 18073 days ago · 2 km deep · 9 km away
  2. 1.715 km SSE of Kittitas, Washington · 18073 days ago · 20 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10843548. Read Fri, Oct 2, 2026, 1:39 AM UTC.