Washington earthquakes

M2.5 earthquake 17 km S of Glacier, Washington

A magnitude 2.5 earthquake struck 17 km S of Glacier, Washington on Sat, Aug 17, 1991, 1:56 PM PDT (20:56 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.

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
2.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-08-17 20:56:42 UTC
Depth
-0.9 km (-0.5 mi), shallow
Epicenter
48.732° N, 121.935° 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 0.4 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
97°
Stations used
22

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 6 in the 30 days before it.

After

  1. 2.021 km ESE of Darrington, Washington · 12831 days ago · 0 km deep · 73 km away
  2. 2.022 km E of Darrington, Washington · 12831 days ago · 0 km deep · 74 km away
  3. 1.52 km SSE of Orcas, Washington · 12829 days ago · 56 km deep · 75 km away
  4. 2.04 km N of Friday Harbor, Washington · 12828 days ago · 54 km deep · 82 km away
  5. 2.21 km NNW of Lake Roesiger, Washington · 12827 days ago · 11 km deep · 82 km away
  6. 1.91 km NW of Lake Roesiger, Washington · 12825 days ago · 11 km deep · 82 km away
  7. 1.81 km N of Lake Roesiger, Washington · 12824 days ago · 11 km deep · 82 km away
  8. 1.98 km SSE of Coupeville, Washington · 12824 days ago · 20 km deep · 83 km away
  9. 2.25 km ESE of Alger, Washington · 12823 days ago · 2 km deep · 29 km away
  10. 1.724 km NNE of Concrete, Washington · 12820 days ago · -1 km deep · 22 km away
  11. 2.01 km NW of Lake Roesiger, Washington · 12818 days ago · 11 km deep · 82 km away
  12. 1.534 km W of Winthrop, Washington · 12815 days ago · -1 km deep · 99 km away
  13. 1.73 km S of Maple Falls, Washington · 12810 days ago · 16 km deep · 21 km away
  14. 1.84 km NW of Marrowstone, Washington · 12810 days ago · 53 km deep · 93 km away
  15. 2.06 km ESE of Alger, Washington · 12809 days ago · 8 km deep · 28 km away
  16. 2.618 km SSE of Marblemount, Washington · 12806 days ago · 9 km deep · 58 km away
  17. 2.36 km NW of Orcas, Washington · 12803 days ago · 18 km deep · 79 km away
  18. 3.06 km NW of Orcas, Washington · 12803 days ago · 19 km deep · 79 km away
  19. 2.04 km NE of Bryant, Washington · 12796 days ago · 11 km deep · 53 km away
  20. 1.63 km E of Deming, Washington · 12776 days ago · 1 km deep · 20 km away

Before

  1. 1.55 km NE of Marrowstone, Washington · 12832 days ago · 26 km deep · 88 km away
  2. 1.56 km ESE of Alger, Washington · 12836 days ago · -1 km deep · 29 km away
  3. 2.07 km W of Aldergrove, Canada · 12837 days ago · 71 km deep · 58 km away
  4. 2.14 km NNW of Hamilton, Washington · 12854 days ago · -1 km deep · 21 km away
  5. 2.03 km WSW of Langley, Canada · 12858 days ago · 12 km deep · 69 km away
  6. 2.12 km SSE of Three Lakes, Washington · 12859 days ago · 3 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10278308. Read Sun, Oct 4, 2026, 7:49 AM UTC.