Washington earthquakes

M2.6 earthquake 0 km N of Riverton, Washington

A magnitude 2.6 earthquake struck 0 km N of Riverton, Washington on Mon, Jan 20, 1975, 1:44 PM PST (21:44 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M2.8 3 km NW of Black Diamond, 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.

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The earthquake

Magnitude
2.6 (md), micro
Local time
UTC
1975-01-20 21:44:45 UTC
Depth
23.6 km (14.7 mi), shallow
Epicenter
47.490° N, 122.294° 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 0.8 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
81°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.13 km S of Issaquah, Washington · 18871 days ago · 15 km deep · 20 km away
  2. 2.210 km ENE of Ashford, Washington · 18862 days ago · 6 km deep · 83 km away
  3. 1.92 km NW of Redmond, Washington · 18861 days ago · 7 km deep · 25 km away
  4. 1.81 km WNW of Snoqualmie, Washington · 18858 days ago · 15 km deep · 34 km away
  5. 2.01 km WSW of Mirrormont, Washington · 18857 days ago · 14 km deep · 21 km away
  6. 1.75 km NNE of Vaughn, Washington · 18841 days ago · 22 km deep · 35 km away
  7. 1.54 km NW of Wauna, Washington · 18835 days ago · 23 km deep · 31 km away
  8. 1.913 km W of Quilcene, Washington · 18834 days ago · 27 km deep · 68 km away
  9. 2.05 km SW of Wilderness Rim, Washington · 18830 days ago · 19 km deep · 37 km away
  10. 1.918 km SSE of Carbonado, Washington · 18826 days ago · 6 km deep · 67 km away
  11. 2.18 km WSW of Lofall, Washington · 18822 days ago · 19 km deep · 49 km away
  12. 2.0Washington · 18822 days ago · 10 km deep · 100 km away
  13. 2.83 km NW of Black Diamond, Washington · 18815 days ago · 20 km deep · 27 km away

Before

  1. 2.313 km SE of Skykomish, Washington · 18874 days ago · 15 km deep · 80 km away
  2. 2.01 km N of Riverton, Washington · 18886 days ago · 21 km deep · 1 km away
  3. 2.52 km SW of Kenmore, Washington · 18887 days ago · 15 km deep · 28 km away
  4. 2.117 km NNE of Packwood, Washington · 18889 days ago · 13 km deep · 97 km away
  5. 1.54 km WSW of Keyport, Washington · 18890 days ago · 17 km deep · 36 km away
  6. 1.93 km WSW of Wilderness Rim, Washington · 18890 days ago · 20 km deep · 36 km away
  7. 2.42 km W of Wauna, Washington · 18894 days ago · 33 km deep · 32 km away
  8. 1.51 km NNE of Riverton, Washington · 18895 days ago · 25 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10860358. Read Tue, Sep 22, 2026, 9:10 AM UTC.