Washington earthquakes

M1.6 earthquake 40 km WSW of Twisp, Washington

A magnitude 1.6 earthquake struck 40 km WSW of Twisp, Washington on Thu, Aug 25, 1983, 6:07 PM PDT (01:07 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M1.9 37 km WSW of Winthrop, Washington. This one was a foreshock.

Twisp 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
1.6 (md), micro
Local time
UTC
1983-08-26 01:07:56 UTC
Depth
6.2 km (3.9 mi), shallow
Epicenter
48.274° N, 120.650° 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 3.4 km horizontally, 4.1 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
194°, poorly surrounded by stations
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 1.937 km WSW of Winthrop, Washington · 15734 days ago · 5 km deep · 6 km away
  2. 1.73 km ENE of Granite Falls, Washington · 15732 days ago · -1 km deep · 96 km away
  3. 1.960 km S of Princeton, Canada · 15726 days ago · 16 km deep · 72 km away
  4. 1.94 km SW of Chelan Falls, Washington · 15725 days ago · 3 km deep · 73 km away
  5. 2.411 km NW of Entiat, Washington · 15715 days ago · 3 km deep · 64 km away
  6. 2.56 km NW of Entiat, Washington · 15714 days ago · 4 km deep · 68 km away
  7. 2.66 km NW of Entiat, Washington · 15714 days ago · 4 km deep · 68 km away
  8. 1.91 km NNE of Lake Roesiger, Washington · 15714 days ago · 11 km deep · 99 km away
  9. 1.82 km E of Granite Falls, Washington · 15712 days ago · -1 km deep · 98 km away
  10. 1.55 km WSW of Waterville, Washington · 15708 days ago · 0 km deep · 81 km away
  11. 2.15 km SSE of Entiat, Washington · 15703 days ago · 5 km deep · 80 km away
  12. 1.54 km SSW of West Wenatchee, Washington · 15700 days ago · 8 km deep · 99 km away
  13. 1.68 km N of Entiat, Washington · 15699 days ago · 5 km deep · 67 km away
  14. 1.85 km E of Granite Falls, Washington · 15694 days ago · -1 km deep · 95 km away
  15. 1.52 km NE of Woods Creek, Washington · 15692 days ago · 12 km deep · 100 km away
  16. 1.54 km N of Entiat, Washington · 15691 days ago · 0 km deep · 70 km away
  17. 1.56 km W of Rockport, Washington · 15689 days ago · 1 km deep · 80 km away
  18. 1.89 km ESE of Verlot, Washington · 15684 days ago · 3 km deep · 80 km away
  19. 1.712 km NNW of Concrete, Washington · 15684 days ago · -1 km deep · 96 km away
  20. 1.69 km NNE of Waterville, Washington · 15684 days ago · 4 km deep · 78 km away
  21. 1.52 km W of Entiat, Washington · 15682 days ago · 0 km deep · 73 km away
  22. 1.64 km W of Entiat, Washington · 15679 days ago · 5 km deep · 72 km away

Before

  1. 1.812 km SW of Methow, Washington · 15740 days ago · 19 km deep · 44 km away
  2. 1.64 km S of Entiat, Washington · 15753 days ago · 0 km deep · 78 km away
  3. 1.511 km WSW of Cashmere, Washington · 15757 days ago · 0 km deep · 87 km away
  4. 1.55 km SSE of Swede Heaven, Washington · 15758 days ago · 9 km deep · 77 km away
  5. 1.77 km NNE of Entiat, Washington · 15760 days ago · 0 km deep · 70 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10162323. Read Tue, Sep 22, 2026, 6:54 PM UTC.