Washington earthquakes

M1.8 earthquake 8 km SSW of Sultan, Washington

A magnitude 1.8 earthquake struck 8 km SSW of Sultan, Washington on Sun, Sep 5, 1999, 3:36 AM PDT (10:36 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.2 3 km ESE of Indianola, Washington. This one was a foreshock.

Sultan 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
1.8 (md), micro
Local time
UTC
1999-09-05 10:36:56 UTC
Depth
6.9 km (4.3 mi), shallow
Epicenter
47.793° N, 121.872° 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 0.6 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
72°
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: 15 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.73 km S of Monroe, Washington · 9879 days ago · 2 km deep · 8 km away
  2. 2.23 km ESE of Indianola, Washington · 9871 days ago · 22 km deep · 46 km away
  3. 2.8Washington · 9864 days ago · 16 km deep · 22 km away
  4. 1.79 km NNE of Snoqualmie, Washington · 9864 days ago · 16 km deep · 22 km away
  5. 2.19 km NNE of Snoqualmie, Washington · 9864 days ago · 15 km deep · 22 km away
  6. 2.01 km ENE of Bellevue, Washington · 9859 days ago · 6 km deep · 31 km away
  7. 1.511 km E of Enumclaw, Washington · 9854 days ago · 2 km deep · 63 km away
  8. 1.62 km N of Gorst, Washington · 9850 days ago · -1 km deep · 68 km away
  9. 1.71 km NNE of Bothell, Washington · 9836 days ago · 27 km deep · 25 km away
  10. 1.60 km NNE of Lyman, Washington · 9835 days ago · -1 km deep · 83 km away
  11. 1.63 km NE of Woods Creek, Washington · 9833 days ago · -1 km deep · 11 km away
  12. 1.64 km NE of North Bend, Washington · 9831 days ago · 16 km deep · 31 km away
  13. 1.610 km NE of Snoqualmie, Washington · 9830 days ago · 14 km deep · 23 km away
  14. 1.51 km WNW of Lea Hill, Washington · 9830 days ago · 63 km deep · 57 km away
  15. 1.50 km W of Lyman, Washington · 9824 days ago · 1 km deep · 83 km away

Before

  1. 1.53 km S of Lake Roesiger, Washington · 9881 days ago · 11 km deep · 19 km away
  2. 1.88 km ENE of Duvall, Washington · 9881 days ago · 6 km deep · 2 km away
  3. 2.9Olympic Peninsula, Washington · 9882 days ago · -1 km deep · 99 km away
  4. 1.62 km WNW of Mirrormont, Washington · 9888 days ago · 17 km deep · 38 km away
  5. 1.69 km NNE of Lake Marcel-Stillwater, Washington · 9888 days ago · 1 km deep · 4 km away
  6. 2.08 km NNE of Lake Marcel-Stillwater, Washington · 9890 days ago · 7 km deep · 4 km away
  7. 1.66 km SW of Lofall, Washington · 9890 days ago · 16 km deep · 64 km away
  8. 1.54 km E of Dash Point, Washington · 9893 days ago · 22 km deep · 65 km away
  9. 2.03 km NNW of Port Townsend, Washington · 9893 days ago · 21 km deep · 78 km away
  10. 3.120 km WSW of Brinnon, Washington · 9896 days ago · 46 km deep · 98 km away
  11. 1.95 km ENE of Bonney Lake, Washington · 9903 days ago · 8 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10476998. Read Tue, Sep 22, 2026, 9:24 PM UTC.