Washington earthquakes

M2.1 earthquake 16 km SSW of Concrete, Washington

A magnitude 2.1 earthquake struck 16 km SSW of Concrete, Washington on Mon, Aug 23, 1976, 8:52 PM PDT (03:52 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.7 6 km WSW of Coupeville, Washington. 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
2.1 (md), micro
Local time
UTC
1976-08-24 03:52:11 UTC
Depth
3.4 km (2.1 mi), shallow
Epicenter
48.411° N, 121.846° 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 10.2 km horizontally, 33.4 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
180°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.85 km NNE of North Bend, Washington · 18285 days ago · 13 km deep · 98 km away
  2. 1.65 km SSW of Fall City, Washington · 18284 days ago · 25 km deep · 99 km away
  3. 1.72 km NNW of Freeland, Washington · 18283 days ago · 24 km deep · 67 km away
  4. 4.76 km WSW of Coupeville, Washington · 18283 days ago · 22 km deep · 72 km away
  5. 2.00 km SSE of Lake Marcel-Stillwater, Washington · 18281 days ago · 27 km deep · 81 km away
  6. 2.15 km WSW of Coupeville, Washington · 18276 days ago · 26 km deep · 71 km away
  7. 1.92 km SSW of Sultan, Washington · 18265 days ago · 14 km deep · 64 km away
  8. 1.713 km NE of Orcas, Washington · 18258 days ago · 65 km deep · 76 km away
  9. 2.12 km W of Eastmont, WA · 18254 days ago · 25 km deep · 63 km away
  10. 1.86 km W of Coupeville, Washington · 18250 days ago · 23 km deep · 72 km away
  11. 1.77 km NNE of North Bend, Washington · 18242 days ago · 15 km deep · 96 km away
  12. 1.61 km SE of Stanwood, Washington · 18236 days ago · 24 km deep · 43 km away
  13. 1.54 km WSW of Hansville, Washington · 18232 days ago · 9 km deep · 80 km away

Before

  1. 1.73 km ENE of Camano, Washington · 18293 days ago · 22 km deep · 54 km away
  2. 1.57 km NNE of Skykomish, Washington · 18305 days ago · 5 km deep · 81 km away
  3. 1.610 km NE of North Bend, Washington · 18306 days ago · 6 km deep · 95 km away
  4. 1.52 km NW of Inglewood-Finn Hill, Washington · 18310 days ago · 25 km deep · 81 km away
  5. 2.74 km SSE of Birch Bay, Washington · 18313 days ago · 17 km deep · 82 km away
  6. 1.57 km N of Anacortes, Washington · 18318 days ago · -1 km deep · 60 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10842043. Read Wed, Sep 23, 2026, 3:22 AM UTC.