Washington earthquakes

M1.8 earthquake 1 km NNE of Riverton, Washington

A magnitude 1.8 earthquake struck 1 km NNE of Riverton, Washington on Mon, Sep 29, 1986, 10:40 PM PDT (05:40 UTC), 25 km (15 mi) below the surface.

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
1.8 (md), micro
Local time
UTC
1986-09-30 05:40:28 UTC
Depth
24.8 km (15.4 mi), shallow
Epicenter
47.497° N, 122.290° 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
±0.05
Depth from
From location
Station coverage gap
47°
Stations used
38

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 1.72 km E of Kirkland, Washington · 14601 days ago · 14 km deep · 22 km away
  2. 1.514 km NNE of Snoqualmie Pass, Washington · 14594 days ago · 5 km deep · 72 km away
  3. 1.83 km NW of Wauna, Washington · 14591 days ago · 25 km deep · 31 km away
  4. 1.51 km S of Erlands Point-Kitsap Lake, Washington · 14579 days ago · 15 km deep · 32 km away
  5. 1.85 km ENE of Southworth, Washington · 14575 days ago · 14 km deep · 11 km away
  6. 1.617 km ESE of Verlot, Washington · 14574 days ago · 7 km deep · 83 km away
  7. 1.73 km WSW of Wilderness Rim, Washington · 14545 days ago · 18 km deep · 36 km away

Before

  1. 2.417 km ESE of Verlot, Washington · 14615 days ago · 7 km deep · 83 km away
  2. 2.820 km E of Verlot, Washington · 14615 days ago · 5 km deep · 86 km away
  3. 1.64 km SW of Darrington, Washington · 14615 days ago · 1 km deep · 94 km away
  4. 2.02 km W of Fox Island, Washington · 14616 days ago · 26 km deep · 40 km away
  5. 2.3Puget Sound region, Washington · 14625 days ago · 13 km deep · 27 km away
  6. 1.60 km S of Oak Harbor, Washington · 14628 days ago · 19 km deep · 91 km away
  7. 2.317 km E of Verlot, Washington · 14630 days ago · 6 km deep · 84 km away
  8. 1.514 km ESE of Verlot, Washington · 14630 days ago · 9 km deep · 82 km away
  9. 1.8Washington · 14630 days ago · -1 km deep · 83 km away
  10. 2.91 km SE of Allyn, Washington · 14632 days ago · 27 km deep · 41 km away
  11. 2.822 km WSW of Skokomish, Washington · 14632 days ago · 40 km deep · 90 km away
  12. 1.73 km SSE of Klahanie, Washington · 14632 days ago · 19 km deep · 23 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10213723. Read Tue, Sep 22, 2026, 7:23 AM UTC.