Washington earthquakes

M2.1 earthquake 9 km NNE of Snoqualmie, Washington

A magnitude 2.1 earthquake struck 9 km NNE of Snoqualmie, Washington on Mon, Sep 20, 1999, 5:00 AM PDT (12:00 UTC), 15 km (10 mi) below the surface.

A larger quake followed: M2.5 2 km SW of Monroe North, Washington. This one was a foreshock.

Snoqualmie 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
2.1 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1999-09-20 12:00:52 UTC
Depth
15.4 km (9.6 mi), shallow
Epicenter
47.605° N, 121.770° 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 0.5 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
34°
Stations used
44

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 17 in the 30 days before it.

After

  1. 2.01 km ENE of Bellevue, Washington · 9869 days ago · 6 km deep · 31 km away
  2. 1.727 km ENE of Ashford, Washington · 9864 days ago · -2 km deep · 84 km away
  3. 1.511 km E of Enumclaw, Washington · 9864 days ago · 2 km deep · 43 km away
  4. 1.62 km N of Gorst, Washington · 9860 days ago · -1 km deep · 71 km away
  5. 1.610 km N of Thorp, Washington · 9854 days ago · 3 km deep · 97 km away
  6. 2.120 km ENE of Ashford, Washington · 9854 days ago · -2 km deep · 85 km away
  7. 1.721 km ENE of Ashford, Washington · 9849 days ago · 0 km deep · 85 km away
  8. 1.71 km NNE of Bothell, Washington · 9845 days ago · 27 km deep · 38 km away
  9. 1.63 km NE of Woods Creek, Washington · 9843 days ago · -1 km deep · 33 km away
  10. 1.64 km NE of North Bend, Washington · 9841 days ago · 16 km deep · 9 km away
  11. 1.610 km NE of Snoqualmie, Washington · 9840 days ago · 14 km deep · 2 km away
  12. 1.51 km WNW of Lea Hill, Washington · 9840 days ago · 63 km deep · 44 km away
  13. 1.714 km NNE of Ashford, Washington · 9832 days ago · 9 km deep · 83 km away
  14. 1.63 km NE of Snoqualmie, Washington · 9826 days ago · 14 km deep · 7 km away
  15. 2.52 km SW of Monroe North, Washington · 9817 days ago · 19 km deep · 34 km away
  16. 1.826 km NNE of Index, Washington · 9816 days ago · 5 km deep · 56 km away

Before

  1. 1.79 km NNE of Snoqualmie, Washington · 9874 days ago · 16 km deep · 0 km away
  2. 2.8Washington · 9874 days ago · 16 km deep · 0 km away
  3. 1.625 km N of Packwood, Washington · 9878 days ago · -3 km deep · 86 km away
  4. 2.23 km ESE of Indianola, Washington · 9881 days ago · 22 km deep · 55 km away
  5. 1.628 km ENE of Ashford, Washington · 9887 days ago · -3 km deep · 82 km away
  6. 1.73 km S of Monroe, Washington · 9889 days ago · 2 km deep · 29 km away
  7. 1.88 km SSW of Sultan, Washington · 9889 days ago · 7 km deep · 22 km away
  8. 1.53 km S of Lake Roesiger, Washington · 9891 days ago · 11 km deep · 41 km away
  9. 1.88 km ENE of Duvall, Washington · 9891 days ago · 6 km deep · 20 km away
  10. 1.62 km WNW of Mirrormont, Washington · 9898 days ago · 17 km deep · 25 km away
  11. 1.69 km NNE of Lake Marcel-Stillwater, Washington · 9898 days ago · 1 km deep · 18 km away
  12. 2.08 km NNE of Lake Marcel-Stillwater, Washington · 9900 days ago · 7 km deep · 18 km away
  13. 1.66 km SW of Lofall, Washington · 9900 days ago · 16 km deep · 74 km away
  14. 1.54 km NE of Cliffdell, Washington · 9900 days ago · -1 km deep · 90 km away
  15. 1.731 km SSE of Greenwater, Washington · 9901 days ago · -1 km deep · 82 km away
  16. 1.54 km E of Dash Point, Washington · 9902 days ago · 22 km deep · 56 km away
  17. 2.03 km NNW of Port Townsend, Washington · 9903 days ago · 21 km deep · 97 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10485053. Read Fri, Oct 2, 2026, 5:34 PM UTC.