Washington earthquakes

M1.9 earthquake 6 km SSE of Concrete, Washington

A magnitude 1.9 earthquake struck 6 km SSE of Concrete, Washington on Sat, Aug 29, 1987, 5:48 PM PDT (00:48 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.0 4 km WSW of Langley, Canada. This one was a foreshock.

Concrete 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
1.9 (md), micro
Local time
UTC
1987-08-30 00:48:32 UTC
Depth
1.7 km (1.1 mi), shallow
Epicenter
48.489° N, 121.712° 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 2.0 km horizontally, 3.6 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
130°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.136 km NE of Skykomish, Washington · 14273 days ago · 0 km deep · 78 km away
  2. 1.736 km NE of Skykomish, Washington · 14273 days ago · 0 km deep · 78 km away
  3. 1.710 km NW of Marblemount, Washington · 14266 days ago · -1 km deep · 18 km away
  4. 1.79 km NNW of Marblemount, Washington · 14265 days ago · 0 km deep · 19 km away
  5. 1.816 km SE of Glacier, Washington · 14262 days ago · 25 km deep · 32 km away
  6. 3.04 km WSW of Langley, Canada · 14259 days ago · 1 km deep · 98 km away
  7. 2.34 km WSW of Langley, Canada · 14257 days ago · 4 km deep · 99 km away
  8. 2.82 km N of Port Townsend, Washington · 14256 days ago · 21 km deep · 86 km away
  9. 1.61 km SW of Lake Marcel-Stillwater, Washington · 14253 days ago · 22 km deep · 91 km away
  10. 2.15 km NE of Kingston, Washington · 14251 days ago · 16 km deep · 91 km away
  11. 2.041 km W of Winthrop, Washington · 14248 days ago · 4 km deep · 72 km away
  12. 1.52 km ESE of Ames Lake, Washington · 14240 days ago · 22 km deep · 98 km away
  13. 1.98 km SSE of Sultan, Washington · 14239 days ago · 14 km deep · 77 km away
  14. 1.68 km NNE of Snoqualmie, Washington · 14232 days ago · 10 km deep · 99 km away

Before

  1. 2.02 km WSW of Birch Bay, Washington · 14278 days ago · 15 km deep · 91 km away
  2. 2.457 km SE of Hope, Canada · 14279 days ago · 34 km deep · 77 km away
  3. 1.65 km NNW of Orcas, Washington · 14285 days ago · 18 km deep · 94 km away
  4. 1.72 km SSW of Birch Bay, Washington · 14285 days ago · 13 km deep · 89 km away
  5. 1.76 km SSW of Geneva, Washington · 14298 days ago · 12 km deep · 59 km away
  6. 1.55 km SSW of Geneva, Washington · 14300 days ago · 12 km deep · 58 km away
  7. 2.06 km SW of Geneva, Washington · 14300 days ago · 12 km deep · 60 km away
  8. 2.71 km N of Port Townsend, Washington · 14300 days ago · 22 km deep · 87 km away
  9. 1.55 km NNE of Duvall, Washington · 14301 days ago · 23 km deep · 80 km away
  10. 1.61 km ESE of Lake Marcel-Stillwater, Washington · 14301 days ago · 0 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10226043. Read Wed, Sep 30, 2026, 8:01 PM UTC.