Washington earthquakes

M1.7 earthquake 36 km NE of Skykomish, Washington

A magnitude 1.7 earthquake struck 36 km NE of Skykomish, Washington on Wed, Sep 2, 1987, 9:22 PM PDT (04:22 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M1.8 5 km NE of Ravensdale, 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
1.7 (md), micro
Local time
UTC
1987-09-03 04:22:29 UTC
Depth
-0.1 km (-0.0 mi), shallow
Epicenter
47.950° N, 121.037° 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 1.1 km horizontally, 2.4 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
109°
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: 15 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.85 km NE of Ravensdale, Washington · 14260 days ago · 2 km deep · 91 km away
  2. 1.710 km NW of Marblemount, Washington · 14258 days ago · -1 km deep · 82 km away
  3. 1.79 km NNW of Marblemount, Washington · 14256 days ago · 0 km deep · 81 km away
  4. 1.75 km NNE of Entiat, Washington · 14251 days ago · -1 km deep · 69 km away
  5. 1.54 km N of Waterville, Washington · 14245 days ago · 2 km deep · 77 km away
  6. 1.61 km SW of Lake Marcel-Stillwater, Washington · 14244 days ago · 22 km deep · 73 km away
  7. 2.09 km SSW of Chelan Falls, Washington · 14240 days ago · 2 km deep · 78 km away
  8. 2.041 km W of Winthrop, Washington · 14240 days ago · 4 km deep · 56 km away
  9. 2.16 km SSE of Wilderness Rim, Washington · 14232 days ago · 1 km deep · 81 km away
  10. 1.52 km ESE of Ames Lake, Washington · 14231 days ago · 22 km deep · 77 km away
  11. 1.98 km SSE of Sultan, Washington · 14231 days ago · 14 km deep · 57 km away
  12. 1.96 km SSE of Wilderness Rim, Washington · 14230 days ago · 1 km deep · 82 km away
  13. 1.68 km NNE of Snoqualmie, Washington · 14223 days ago · 10 km deep · 68 km away
  14. 1.56 km NW of Entiat, Washington · 14213 days ago · 0 km deep · 63 km away
  15. 1.87 km WSW of Wilderness Rim, Washington · 14204 days ago · 16 km deep · 85 km away

Before

  1. 2.136 km NE of Skykomish, Washington · 14264 days ago · 0 km deep · 0 km away
  2. 1.96 km SSE of Concrete, Washington · 14268 days ago · 2 km deep · 78 km away
  3. 1.81 km NNW of Tanner, Washington · 14275 days ago · 9 km deep · 74 km away
  4. 2.06 km NE of Thorp, Washington · 14277 days ago · 8 km deep · 98 km away
  5. 1.72 km N of Black Diamond, Washington · 14277 days ago · 18 km deep · 100 km away
  6. 1.57 km ESE of Ravensdale, Washington · 14278 days ago · -1 km deep · 95 km away
  7. 2.010 km WNW of Entiat, Washington · 14281 days ago · -1 km deep · 59 km away
  8. 2.24 km SW of Entiat, Washington · 14290 days ago · -1 km deep · 68 km away
  9. 1.55 km NNE of Duvall, Washington · 14293 days ago · 23 km deep · 70 km away
  10. 1.61 km ESE of Lake Marcel-Stillwater, Washington · 14293 days ago · 0 km deep · 71 km away
  11. 1.66 km WSW of Easton, Washington · 14293 days ago · 20 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10221428. Read Tue, Sep 22, 2026, 10:46 AM UTC.