Washington earthquakes

M1.5 earthquake 1 km NNE of Riverton, Washington

A magnitude 1.5 earthquake struck 1 km NNE of Riverton, Washington on Sun, Dec 29, 1974, 1:22 AM PST (09:22 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M2.6 0 km N of Riverton, Washington. This one was a foreshock.

Riverton forecastMore in Washington

Map

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

Open the live map with earthquakes

The earthquake

Magnitude
1.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1974-12-29 09:22:50 UTC
Depth
24.9 km (15.4 mi), shallow
Epicenter
47.497° N, 122.284° 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 1.6 km horizontally, 3.2 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
259°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.42 km W of Wauna, Washington · 18905 days ago · 33 km deep · 33 km away
  2. 1.93 km WSW of Wilderness Rim, Washington · 18901 days ago · 20 km deep · 36 km away
  3. 1.54 km WSW of Keyport, Washington · 18901 days ago · 17 km deep · 36 km away
  4. 2.117 km NNE of Packwood, Washington · 18900 days ago · 13 km deep · 98 km away
  5. 2.52 km SW of Kenmore, Washington · 18899 days ago · 15 km deep · 27 km away
  6. 2.01 km N of Riverton, Washington · 18897 days ago · 21 km deep · 1 km away
  7. 2.313 km SE of Skykomish, Washington · 18885 days ago · 15 km deep · 79 km away
  8. 2.60 km N of Riverton, Washington · 18884 days ago · 24 km deep · 1 km away
  9. 2.13 km S of Issaquah, Washington · 18882 days ago · 15 km deep · 19 km away
  10. 2.210 km ENE of Ashford, Washington · 18874 days ago · 6 km deep · 83 km away
  11. 1.92 km NW of Redmond, Washington · 18872 days ago · 7 km deep · 23 km away
  12. 1.81 km WNW of Snoqualmie, Washington · 18869 days ago · 15 km deep · 33 km away
  13. 2.01 km WSW of Mirrormont, Washington · 18868 days ago · 14 km deep · 21 km away
  14. 1.75 km NNE of Vaughn, Washington · 18853 days ago · 22 km deep · 36 km away

Before

  1. 1.911 km ENE of Ashford, Washington · 18926 days ago · 3 km deep · 83 km away
  2. 1.62 km WNW of Bryn Mawr-Skyway, Washington · 18933 days ago · 27 km deep · 1 km away
  3. 2.90 km NNE of Seattle, Washington · 18934 days ago · -1 km deep · 13 km away
  4. 1.92 km NE of Riverton, Washington · 18935 days ago · 25 km deep · 0 km away
  5. 1.63 km NNW of Bryn Mawr-Skyway, Washington · 18935 days ago · 30 km deep · 4 km away
  6. 1.514 km SW of Alder, Washington · 18936 days ago · 26 km deep · 88 km away
  7. 1.52 km NNW of Gorst, Washington · 18936 days ago · 17 km deep · 33 km away

Earthquakes todayWashington earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10860233. Read Sat, Oct 3, 2026, 3:23 PM UTC.