Washington earthquakes

M1.5 earthquake 4 km SSW of Big Lake, Washington

A magnitude 1.5 earthquake struck 4 km SSW of Big Lake, Washington on Tue, Jul 21, 1987, 4:08 AM PDT (11:08 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M1.7 4 km E of Maple Falls, Washington. This one was a foreshock.

Big Lake forecastMore in Washington

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.5 (md), micro
Local time
UTC
1987-07-21 11:08:06 UTC
Depth
18.0 km (11.2 mi), shallow
Epicenter
48.365° N, 122.273° 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 0.9 km horizontally, 1.2 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
80°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 1.74 km E of Maple Falls, Washington · 14302 days ago · 0 km deep · 65 km away
  2. 1.61 km ESE of Lake Marcel-Stillwater, Washington · 14293 days ago · 0 km deep · 80 km away
  3. 1.55 km NNE of Duvall, Washington · 14293 days ago · 23 km deep · 69 km away
  4. 2.71 km N of Port Townsend, Washington · 14292 days ago · 22 km deep · 45 km away
  5. 2.06 km SW of Geneva, Washington · 14292 days ago · 12 km deep · 39 km away
  6. 1.55 km SSW of Geneva, Washington · 14291 days ago · 12 km deep · 40 km away
  7. 1.76 km SSW of Geneva, Washington · 14290 days ago · 12 km deep · 39 km away
  8. 1.87 km WNW of Gorst, Washington · 14287 days ago · 11 km deep · 97 km away
  9. 1.715 km ESE of Oak Bay, Canada · 14278 days ago · 5 km deep · 62 km away
  10. 1.72 km SSW of Birch Bay, Washington · 14277 days ago · 13 km deep · 69 km away
  11. 1.65 km NNW of Orcas, Washington · 14276 days ago · 18 km deep · 60 km away
  12. 2.02 km WSW of Birch Bay, Washington · 14270 days ago · 15 km deep · 71 km away
  13. 1.96 km SSE of Concrete, Washington · 14268 days ago · 2 km deep · 44 km away
  14. 1.83 km NW of Bainbridge Island, Washington · 14264 days ago · 20 km deep · 83 km away
  15. 1.515 km E of North Saanich, Canada · 14258 days ago · 50 km deep · 77 km away
  16. 1.710 km NW of Marblemount, Washington · 14258 days ago · -1 km deep · 61 km away
  17. 1.79 km NNW of Marblemount, Washington · 14256 days ago · 0 km deep · 62 km away
  18. 1.816 km SE of Glacier, Washington · 14253 days ago · 25 km deep · 57 km away
  19. 3.04 km WSW of Langley, Canada · 14251 days ago · 1 km deep · 86 km away
  20. 2.34 km WSW of Langley, Canada · 14249 days ago · 4 km deep · 86 km away

Before

  1. 1.55 km W of Lyman, Washington · 14323 days ago · -1 km deep · 21 km away
  2. 2.45 km ESE of Oak Harbor, Washington · 14323 days ago · 25 km deep · 24 km away
  3. 1.92 km WNW of City of Sammamish, Washington · 14326 days ago · 0 km deep · 85 km away
  4. 2.26 km WSW of Peaceful Valley, Washington · 14328 days ago · 16 km deep · 61 km away
  5. 2.48 km W of Port Townsend, Washington · 14329 days ago · 45 km deep · 53 km away
  6. 1.911 km SSW of Port Hadlock-Irondale, Washington · 14330 days ago · 50 km deep · 63 km away
  7. 2.72 km E of Edmonds, Washington · 14333 days ago · 15 km deep · 62 km away
  8. 1.77 km S of Bellingham, Washington · 14335 days ago · -1 km deep · 40 km away
  9. 1.5Washington · 14337 days ago · 3 km deep · 57 km away
  10. 1.66 km WNW of Orcas, Washington · 14337 days ago · 16 km deep · 62 km away

Earthquakes todayWashington earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10221913. Read Tue, Sep 22, 2026, 11:12 AM UTC.