Washington earthquakes

M1.6 earthquake 10 km N of Thorp, Washington

A magnitude 1.6 earthquake struck 10 km N of Thorp, Washington on Sun, Oct 10, 1999, 4:39 PM PDT (23:39 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.8 8 km WSW of Entiat, Washington. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.6 (md), micro
Local time
UTC
1999-10-10 23:39:42 UTC
Depth
2.6 km (1.6 mi), shallow
Epicenter
47.161° N, 120.665° 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 0.8 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
43°
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: 11 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.120 km ENE of Ashford, Washington · 9848 days ago · -2 km deep · 92 km away
  2. 1.721 km ENE of Ashford, Washington · 9844 days ago · 0 km deep · 91 km away
  3. 2.88 km WSW of Entiat, Washington · 9840 days ago · 4 km deep · 61 km away
  4. 1.64 km NE of North Bend, Washington · 9835 days ago · 16 km deep · 91 km away
  5. 1.610 km NE of Snoqualmie, Washington · 9835 days ago · 14 km deep · 95 km away
  6. 2.312 km E of Waterville, Washington · 9830 days ago · -1 km deep · 78 km away
  7. 2.59 km NE of Rock Island, Washington · 9822 days ago · -1 km deep · 55 km away
  8. 1.63 km NE of Snoqualmie, Washington · 9820 days ago · 14 km deep · 95 km away
  9. 1.63 km N of Tieton, Washington · 9814 days ago · 9 km deep · 48 km away
  10. 1.75 km NNE of White Swan, Washington · 9800 days ago · 12 km deep · 82 km away
  11. 2.113 km W of Greenwater, Washington · 9791 days ago · 14 km deep · 87 km away

Before

  1. 1.511 km E of Enumclaw, Washington · 9858 days ago · 2 km deep · 89 km away
  2. 1.727 km ENE of Ashford, Washington · 9859 days ago · -2 km deep · 86 km away
  3. 2.23 km S of Entiat, Washington · 9864 days ago · 0 km deep · 64 km away
  4. 2.224 km ENE of Packwood, Washington · 9864 days ago · 5 km deep · 76 km away
  5. 1.57 km N of Outlook, Washington · 9866 days ago · 11 km deep · 95 km away
  6. 1.66 km N of Outlook, Washington · 9868 days ago · 7 km deep · 96 km away
  7. 2.19 km NNE of Snoqualmie, Washington · 9869 days ago · 15 km deep · 97 km away
  8. 1.79 km NNE of Snoqualmie, Washington · 9869 days ago · 16 km deep · 97 km away
  9. 2.8Washington · 9869 days ago · 16 km deep · 96 km away
  10. 2.77 km N of Outlook, Washington · 9870 days ago · 11 km deep · 95 km away
  11. 1.625 km N of Packwood, Washington · 9872 days ago · -3 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10479258. Read Sun, Sep 27, 2026, 12:06 AM UTC.