Washington earthquakes

M1.8 earthquake Washington

A magnitude 1.8 earthquake struck in Washington on Sun, May 11, 1986, 4:04 AM PDT (11:04 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M2.2 7 km WNW of Morton, Washington. This one was a foreshock.

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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
1986-05-11 11:04:56 UTC
Depth
7.8 km (4.9 mi), shallow
Epicenter
47.098° N, 121.867° 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 0.4 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
59°
Stations used
21

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. 1.5Washington · 14742 days ago · 16 km deep · 56 km away
  2. 2.27 km WNW of Morton, Washington · 14732 days ago · 9 km deep · 69 km away
  3. 1.824 km S of Morton, Washington · 14724 days ago · 7 km deep · 89 km away
  4. 1.719 km S of Morton, Washington · 14721 days ago · 11 km deep · 86 km away
  5. 1.52 km NE of Southworth, Washington · 14718 days ago · 20 km deep · 67 km away
  6. 1.62 km NE of Southworth, Washington · 14718 days ago · 20 km deep · 67 km away
  7. 2.02 km NNE of Southworth, Washington · 14718 days ago · 19 km deep · 67 km away
  8. 2.223 km ESE of Packwood, Washington · 14717 days ago · 5 km deep · 74 km away
  9. 1.612 km W of Tieton, Washington · 14712 days ago · -1 km deep · 84 km away
  10. 2.65 km E of Tanner, Washington · 14707 days ago · 16 km deep · 44 km away
  11. 2.29 km E of McKenna, Washington · 14707 days ago · 20 km deep · 47 km away
  12. 2.76 km ENE of Lofall, Washington · 14694 days ago · 19 km deep · 98 km away

Before

  1. 2.123 km S of Morton, Washington · 14746 days ago · 8 km deep · 88 km away
  2. 2.63 km NNW of Kingston, Washington · 14751 days ago · 25 km deep · 94 km away
  3. 2.36 km S of Hansville, Washington · 14751 days ago · 25 km deep · 99 km away
  4. 2.125 km S of Morton, Washington · 14752 days ago · 10 km deep · 90 km away
  5. 1.51 km WNW of North Bend, Washington · 14757 days ago · 16 km deep · 45 km away
  6. 1.623 km W of Cliffdell, Washington · 14759 days ago · 3 km deep · 41 km away
  7. 1.95 km ESE of Mossyrock, Washington · 14767 days ago · 18 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10210878. Read Tue, Sep 22, 2026, 9:59 AM UTC.