Washington earthquakes

M1.8 earthquake 1 km NNW of Tanner, Washington

A magnitude 1.8 earthquake struck 1 km NNW of Tanner, Washington on Sat, Aug 22, 1987, 7:51 PM PDT (02:51 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M2.1 36 km NE of Skykomish, Washington. This one was a foreshock.

Tanner 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
1987-08-23 02:51:22 UTC
Depth
9.3 km (5.8 mi), shallow
Epicenter
47.489° N, 121.752° 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, 1.1 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
102°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.136 km NE of Skykomish, Washington · 14265 days ago · 0 km deep · 74 km away
  2. 1.736 km NE of Skykomish, Washington · 14265 days ago · 0 km deep · 74 km away
  3. 1.83 km NW of Bainbridge Island, Washington · 14264 days ago · 20 km deep · 63 km away
  4. 2.123 km ENE of Ashford, Washington · 14264 days ago · 1 km deep · 70 km away
  5. 1.85 km NE of Ravensdale, Washington · 14260 days ago · 2 km deep · 17 km away
  6. 1.61 km SW of Lake Marcel-Stillwater, Washington · 14245 days ago · 22 km deep · 25 km away
  7. 1.513 km NE of Cliffdell, Washington · 14244 days ago · -1 km deep · 80 km away
  8. 2.15 km NE of Kingston, Washington · 14243 days ago · 16 km deep · 65 km away
  9. 1.87 km SSW of Quilcene, Washington · 14237 days ago · 47 km deep · 93 km away
  10. 1.62 km W of Black Diamond, Washington · 14234 days ago · 13 km deep · 30 km away
  11. 2.16 km SSE of Wilderness Rim, Washington · 14232 days ago · 1 km deep · 11 km away
  12. 1.52 km ESE of Ames Lake, Washington · 14232 days ago · 22 km deep · 20 km away
  13. 1.98 km SSE of Sultan, Washington · 14232 days ago · 14 km deep · 34 km away
  14. 1.96 km SSE of Wilderness Rim, Washington · 14230 days ago · 1 km deep · 11 km away
  15. 1.68 km NNE of Snoqualmie, Washington · 14224 days ago · 10 km deep · 12 km away
  16. 1.60 km SE of Lakeland South, Washington · 14222 days ago · 16 km deep · 46 km away
  17. 2.025 km ENE of Ashford, Washington · 14220 days ago · -1 km deep · 69 km away

Before

  1. 2.06 km NE of Thorp, Washington · 14277 days ago · 8 km deep · 95 km away
  2. 1.72 km N of Black Diamond, Washington · 14278 days ago · 18 km deep · 26 km away
  3. 1.57 km ESE of Ravensdale, Washington · 14278 days ago · -1 km deep · 22 km away
  4. 1.87 km WNW of Gorst, Washington · 14288 days ago · 11 km deep · 79 km away
  5. 1.55 km NNE of Duvall, Washington · 14293 days ago · 23 km deep · 36 km away
  6. 1.61 km ESE of Lake Marcel-Stillwater, Washington · 14294 days ago · 0 km deep · 25 km away
  7. 1.66 km WSW of Easton, Washington · 14294 days ago · 20 km deep · 48 km away
  8. 1.85 km NE of Tanner, Washington · 14299 days ago · 13 km deep · 5 km away
  9. 1.625 km ENE of Ashford, Washington · 14305 days ago · 0 km deep · 70 km away
  10. 2.711 km ENE of Hoodsport, Washington · 14305 days ago · 15 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10224758. Read Wed, Sep 23, 2026, 12:58 AM UTC.