Washington earthquakes

M1.7 earthquake 24 km NNE of Concrete, Washington

A magnitude 1.7 earthquake struck 24 km NNE of Concrete, Washington on Thu, Aug 29, 1991, 6:51 AM PDT (13:51 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.6 18 km SSE of Marblemount, 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.

Open the live map with earthquakes

The earthquake

Magnitude
1.7 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-08-29 13:51:38 UTC
Depth
-1.0 km (-0.6 mi), shallow
Epicenter
48.742° N, 121.629° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
175°
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: 8 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.01 km NW of Lake Roesiger, Washington · 12818 days ago · 11 km deep · 86 km away
  2. 1.534 km W of Winthrop, Washington · 12815 days ago · -1 km deep · 78 km away
  3. 1.73 km S of Maple Falls, Washington · 12810 days ago · 16 km deep · 37 km away
  4. 2.06 km ESE of Alger, Washington · 12809 days ago · 8 km deep · 49 km away
  5. 2.618 km SSE of Marblemount, Washington · 12806 days ago · 9 km deep · 45 km away
  6. 2.04 km NE of Bryant, Washington · 12796 days ago · 11 km deep · 63 km away
  7. 1.63 km E of Deming, Washington · 12776 days ago · 1 km deep · 41 km away
  8. 1.59 km NNW of Ault Field, Washington · 12770 days ago · 50 km deep · 88 km away

Before

  1. 2.25 km ESE of Alger, Washington · 12823 days ago · 2 km deep · 50 km away
  2. 1.98 km SSE of Coupeville, Washington · 12823 days ago · 20 km deep · 100 km away
  3. 1.81 km N of Lake Roesiger, Washington · 12823 days ago · 11 km deep · 86 km away
  4. 1.91 km NW of Lake Roesiger, Washington · 12825 days ago · 11 km deep · 86 km away
  5. 2.21 km NNW of Lake Roesiger, Washington · 12827 days ago · 11 km deep · 86 km away
  6. 1.52 km SSE of Orcas, Washington · 12829 days ago · 56 km deep · 97 km away
  7. 2.022 km E of Darrington, Washington · 12831 days ago · 0 km deep · 63 km away
  8. 2.021 km ESE of Darrington, Washington · 12831 days ago · 0 km deep · 63 km away
  9. 2.517 km S of Glacier, Washington · 12831 days ago · -1 km deep · 22 km away
  10. 1.56 km ESE of Alger, Washington · 12835 days ago · -1 km deep · 50 km away
  11. 2.07 km W of Aldergrove, Canada · 12836 days ago · 71 km deep · 77 km away

Earthquakes todayWashington earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10282168. Read Sun, Oct 4, 2026, 3:06 AM UTC.