Washington earthquakes

M1.7 earthquake 1 km NNE of Mill Plain, Washington

A magnitude 1.7 earthquake struck 1 km NNE of Mill Plain, Washington on Sun, Feb 24, 1991, 5:59 PM PST (01:59 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M3.1 5 km ESE of Ridgefield, Washington. This one was a foreshock.

Mill Plain 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
1.7 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-02-25 01:59:40 UTC
Depth
11.4 km (7.1 mi), shallow
Epicenter
45.655° N, 122.490° 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 1.0 km horizontally, 7.8 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
81°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 3.15 km ESE of Ridgefield, Washington · 12995 days ago · 19 km deep · 21 km away
  2. 1.75 km ESE of Ridgefield, Washington · 12986 days ago · 19 km deep · 21 km away
  3. 1.525 km S of Morton, Washington · 12984 days ago · 8 km deep · 77 km away
  4. 1.97 km ESE of Venersborg, Washington · 12980 days ago · 4 km deep · 16 km away
  5. 1.816 km S of Morton, Washington · 12980 days ago · 10 km deep · 86 km away
  6. 1.55 km NE of Estacada, Oregon · 12979 days ago · 16 km deep · 40 km away
  7. 2.138 km NNE of Amboy, Washington · 12977 days ago · 1 km deep · 66 km away
  8. 1.835 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 63 km away
  9. 2.438 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 66 km away
  10. 1.636 km NNE of Amboy, Washington · 12977 days ago · -1 km deep · 64 km away
  11. 1.719 km S of Morton, Washington · 12976 days ago · 6 km deep · 82 km away
  12. 2.324 km S of Morton, Washington · 12970 days ago · 11 km deep · 79 km away
  13. 1.71 km SSW of Salmon Creek, Washington · 12958 days ago · 20 km deep · 14 km away
  14. 1.618 km ENE of Kalama, Washington · 12954 days ago · 15 km deep · 45 km away
  15. 1.54 km NE of La Center, Washington · 12945 days ago · 15 km deep · 28 km away
  16. 1.937 km NNE of Amboy, Washington · 12944 days ago · -2 km deep · 64 km away

Before

  1. 2.23 km N of North Portland, Oregon · 13004 days ago · 14 km deep · 17 km away
  2. 1.538 km NNE of Amboy, Washington · 13005 days ago · 0 km deep · 65 km away
  3. 1.836 km NNE of Amboy, Washington · 13013 days ago · 0 km deep · 63 km away
  4. 1.537 km NE of Amboy, Washington · 13014 days ago · -2 km deep · 65 km away
  5. 1.67 km ENE of Government Camp, Oregon · 13015 days ago · 4 km deep · 73 km away
  6. 1.737 km NNE of Amboy, Washington · 13021 days ago · -1 km deep · 65 km away
  7. 1.939 km S of Morton, Washington · 13022 days ago · 1 km deep · 67 km away
  8. 1.85 km SSW of Aloha, Oregon · 13023 days ago · 37 km deep · 38 km away
  9. 1.637 km NNE of Amboy, Washington · 13024 days ago · -1 km deep · 65 km away
  10. 1.511 km ESE of Yacolt, Washington · 13025 days ago · 8 km deep · 25 km away
  11. 1.822 km NNW of Carson, Washington · 13030 days ago · 6 km deep · 48 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10273148. Read Fri, Oct 2, 2026, 12:19 AM UTC.