Washington earthquakes

M1.7 earthquake 2 km N of Black Diamond, Washington

A magnitude 1.7 earthquake struck 2 km N of Black Diamond, Washington on Thu, Aug 20, 1987, 4:42 PM PDT (23:42 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M1.8 1 km NNW of Tanner, Washington. This one was a foreshock.

Black Diamond 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
1.7 (md), micro
Local time
UTC
1987-08-20 23:42:48 UTC
Depth
18.5 km (11.5 mi), shallow
Epicenter
47.331° N, 122.005° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
79°
Stations used
26

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 1.81 km NNW of Tanner, Washington · 14275 days ago · 9 km deep · 26 km away
  2. 1.736 km NE of Skykomish, Washington · 14264 days ago · 0 km deep · 100 km away
  3. 1.83 km NW of Bainbridge Island, Washington · 14264 days ago · 20 km deep · 54 km away
  4. 2.123 km ENE of Ashford, Washington · 14263 days ago · 1 km deep · 56 km away
  5. 1.85 km NE of Ravensdale, Washington · 14260 days ago · 2 km deep · 9 km away
  6. 2.616 km WSW of Alder, Washington · 14253 days ago · 18 km deep · 77 km away
  7. 1.61 km SW of Lake Marcel-Stillwater, Washington · 14244 days ago · 22 km deep · 40 km away
  8. 1.513 km NE of Cliffdell, Washington · 14244 days ago · -1 km deep · 88 km away
  9. 1.930 km E of Packwood, Washington · 14243 days ago · -1 km deep · 99 km away
  10. 2.15 km NE of Kingston, Washington · 14242 days ago · 16 km deep · 65 km away
  11. 1.87 km SSW of Quilcene, Washington · 14236 days ago · 47 km deep · 84 km away
  12. 1.62 km W of Black Diamond, Washington · 14234 days ago · 13 km deep · 4 km away
  13. 2.16 km SSE of Wilderness Rim, Washington · 14232 days ago · 1 km deep · 21 km away
  14. 1.52 km ESE of Ames Lake, Washington · 14231 days ago · 22 km deep · 33 km away
  15. 1.98 km SSE of Sultan, Washington · 14231 days ago · 14 km deep · 54 km away
  16. 1.96 km SSE of Wilderness Rim, Washington · 14230 days ago · 1 km deep · 21 km away
  17. 1.68 km NNE of Snoqualmie, Washington · 14223 days ago · 10 km deep · 34 km away
  18. 1.60 km SE of Lakeland South, Washington · 14222 days ago · 16 km deep · 21 km away
  19. 2.025 km ENE of Ashford, Washington · 14219 days ago · -1 km deep · 56 km away

Before

  1. 1.57 km ESE of Ravensdale, Washington · 14278 days ago · -1 km deep · 9 km away
  2. 1.87 km WNW of Gorst, Washington · 14287 days ago · 11 km deep · 65 km away
  3. 1.55 km NNE of Duvall, Washington · 14293 days ago · 23 km deep · 50 km away
  4. 1.61 km ESE of Lake Marcel-Stillwater, Washington · 14293 days ago · 0 km deep · 40 km away
  5. 1.66 km WSW of Easton, Washington · 14293 days ago · 20 km deep · 58 km away
  6. 1.85 km NE of Tanner, Washington · 14298 days ago · 13 km deep · 30 km away
  7. 1.625 km ENE of Ashford, Washington · 14304 days ago · 0 km deep · 57 km away
  8. 2.711 km ENE of Hoodsport, Washington · 14304 days ago · 15 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10224078. Read Tue, Sep 22, 2026, 11:04 AM UTC.