Washington earthquakes

M2.2 earthquake 2 km NNE of Riverton, Washington

A magnitude 2.2 earthquake struck 2 km NNE of Riverton, Washington on Tue, Apr 1, 1975, 3:32 PM PDT (22:32 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M3.7 11 km SW of Greenwater, 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
2.2 (md), micro
Local time
UTC
1975-04-01 22:32:55 UTC
Depth
24.7 km (15.4 mi), shallow
Epicenter
47.508° N, 122.280° 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 0.5 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
106°
Stations used
10

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 7 in the 30 days before it.

After

  1. 3.711 km SW of Greenwater, Washington · 18793 days ago · 6 km deep · 63 km away
  2. 2.817 km ESE of Carbonado, Washington · 18793 days ago · -1 km deep · 61 km away
  3. 2.327 km S of Greenwater, Washington · 18793 days ago · 1 km deep · 85 km away
  4. 2.128 km S of Greenwater, Washington · 18789 days ago · 2 km deep · 85 km away
  5. 4.010 km SSW of Seabeck, Washington · 18787 days ago · 40 km deep · 47 km away
  6. 3.927 km S of Greenwater, Washington · 18786 days ago · 4 km deep · 84 km away
  7. 1.929 km SSE of Greenwater, Washington · 18786 days ago · 1 km deep · 86 km away
  8. 4.22 km SW of DuPont, Washington · 18781 days ago · 45 km deep · 56 km away
  9. 2.05 km NNE of Startup, Washington · 18771 days ago · 26 km deep · 62 km away
  10. 1.71 km NNE of Snoqualmie, Washington · 18752 days ago · 8 km deep · 35 km away
  11. 1.55 km S of Fall City, Washington · 18748 days ago · 18 km deep · 29 km away
  12. 1.75 km SSE of Keyport, Washington · 18745 days ago · 18 km deep · 29 km away

Before

  1. 1.88 km W of Longbranch, Washington · 18803 days ago · 8 km deep · 56 km away
  2. 2.13 km NE of Dash Point, Washington · 18804 days ago · 14 km deep · 20 km away
  3. 2.83 km NW of Black Diamond, Washington · 18815 days ago · 20 km deep · 27 km away
  4. 2.0Washington · 18823 days ago · 10 km deep · 98 km away
  5. 2.18 km WSW of Lofall, Washington · 18823 days ago · 19 km deep · 49 km away
  6. 1.918 km SSE of Carbonado, Washington · 18827 days ago · 6 km deep · 69 km away
  7. 2.05 km SW of Wilderness Rim, Washington · 18831 days ago · 19 km deep · 36 km away

Earthquakes todayWashington earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10860548. Read Tue, Sep 22, 2026, 10:25 PM UTC.