Washington earthquakes

M1.5 earthquake 6 km ESE of Alger, Washington

A magnitude 1.5 earthquake struck 6 km ESE of Alger, Washington on Tue, Aug 13, 1991, 12:41 PM PDT (19:41 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M3.0 6 km NW of Orcas, Washington. This one was a foreshock.

Sedro-Woolley 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
1.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-08-13 19:41:06 UTC
Depth
-1.0 km (-0.6 mi), shallow
Epicenter
48.595° N, 122.269° 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 0.1 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
129°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.55 km NE of Marrowstone, Washington · 12830 days ago · 26 km deep · 63 km away
  2. 2.517 km S of Glacier, Washington · 12830 days ago · -1 km deep · 29 km away
  3. 2.021 km ESE of Darrington, Washington · 12830 days ago · 0 km deep · 82 km away
  4. 2.022 km E of Darrington, Washington · 12829 days ago · 0 km deep · 83 km away
  5. 1.52 km SSE of Orcas, Washington · 12827 days ago · 56 km deep · 49 km away
  6. 2.04 km N of Friday Harbor, Washington · 12826 days ago · 54 km deep · 56 km away
  7. 2.21 km NNW of Lake Roesiger, Washington · 12826 days ago · 11 km deep · 71 km away
  8. 1.91 km NW of Lake Roesiger, Washington · 12823 days ago · 11 km deep · 71 km away
  9. 1.81 km N of Lake Roesiger, Washington · 12822 days ago · 11 km deep · 71 km away
  10. 1.98 km SSE of Coupeville, Washington · 12822 days ago · 20 km deep · 57 km away
  11. 2.25 km ESE of Alger, Washington · 12821 days ago · 2 km deep · 1 km away
  12. 1.724 km NNE of Concrete, Washington · 12818 days ago · -1 km deep · 50 km away
  13. 2.01 km NW of Lake Roesiger, Washington · 12817 days ago · 11 km deep · 71 km away
  14. 1.73 km S of Maple Falls, Washington · 12808 days ago · 16 km deep · 36 km away
  15. 1.84 km NW of Marrowstone, Washington · 12808 days ago · 53 km deep · 66 km away
  16. 2.06 km ESE of Alger, Washington · 12807 days ago · 8 km deep · 1 km away
  17. 2.618 km SSE of Marblemount, Washington · 12805 days ago · 9 km deep · 72 km away
  18. 2.36 km NW of Orcas, Washington · 12801 days ago · 18 km deep · 54 km away
  19. 3.06 km NW of Orcas, Washington · 12801 days ago · 19 km deep · 54 km away
  20. 2.04 km NE of Bryant, Washington · 12795 days ago · 11 km deep · 38 km away
  21. 2.05 km NNE of Lake Marcel-Stillwater, Washington · 12790 days ago · 17 km deep · 99 km away
  22. 2.413 km SSW of Blyn, Washington · 12779 days ago · 42 km deep · 97 km away
  23. 1.63 km E of Deming, Washington · 12775 days ago · 1 km deep · 26 km away

Before

  1. 2.07 km W of Aldergrove, Canada · 12835 days ago · 71 km deep · 55 km away
  2. 1.71 km E of Edmonds, Washington · 12848 days ago · 21 km deep · 88 km away
  3. 1.74 km SW of Sultan, Washington · 12848 days ago · 17 km deep · 90 km away
  4. 2.14 km NNW of Hamilton, Washington · 12852 days ago · -1 km deep · 19 km away
  5. 2.03 km WSW of Langley, Canada · 12857 days ago · 12 km deep · 64 km away
  6. 2.12 km SSE of Three Lakes, Washington · 12858 days ago · 3 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10276873. Read Fri, Oct 2, 2026, 3:03 PM UTC.