Washington earthquakes

M1.7 earthquake 11 km NW of Okanogan, Washington

A magnitude 1.7 earthquake struck 11 km NW of Okanogan, Washington on Mon, Nov 7, 1983, 10:37 AM PST (18:37 UTC), 23 km (15 mi) below the surface.

A larger quake followed: M2.3 14 km E of Mansfield, Washington. This one was a foreshock.

Okanogan 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), micro
Local time
UTC
1983-11-07 18:37:39 UTC
Depth
23.5 km (14.6 mi), shallow
Epicenter
48.439° N, 119.675° 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 41.3 km horizontally, 38.9 km in depth
Magnitude uncertainty
±0.11
Depth from
Operator assigned
Station coverage gap
213°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 1.54 km N of Entiat, Washington · 15668 days ago · 0 km deep · 90 km away
  2. 2.02 km WNW of Tonasket, Washington · 15657 days ago · 2 km deep · 34 km away
  3. 2.236 km SSE of Princeton, Canada · 15651 days ago · 29 km deep · 93 km away
  4. 2.314 km E of Mansfield, Washington · 15651 days ago · -1 km deep · 69 km away
  5. 1.910 km ENE of Mansfield, Washington · 15626 days ago · 0 km deep · 68 km away
  6. 2.37 km NE of Entiat, Washington · 15621 days ago · 4 km deep · 88 km away

Before

  1. 1.89 km WNW of Entiat, Washington · 15670 days ago · 2 km deep · 96 km away
  2. 1.77 km NNE of Waterville, Washington · 15672 days ago · 0 km deep · 86 km away
  3. 1.86 km N of Waterville, Washington · 15674 days ago · 0 km deep · 87 km away
  4. 1.65 km NNE of Entiat, Washington · 15681 days ago · 0 km deep · 89 km away
  5. 1.64 km W of Entiat, Washington · 15687 days ago · 5 km deep · 95 km away
  6. 1.52 km W of Entiat, Washington · 15691 days ago · 0 km deep · 94 km away
  7. 1.69 km NNE of Waterville, Washington · 15692 days ago · 4 km deep · 84 km away
  8. 1.619 km ENE of Nespelem, Washington · 15696 days ago · 0 km deep · 71 km away
  9. 2.023 km E of Mansfield, Washington · 15698 days ago · 3 km deep · 71 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10166618. Read Thu, Oct 1, 2026, 12:04 AM UTC.