Washington earthquakes

M1.6 earthquake 28 km SW of Twisp, Washington

A magnitude 1.6 earthquake struck 28 km SW of Twisp, Washington on Sat, Sep 11, 1982, 3:52 AM PDT (10:52 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M1.8 6 km NNW of Waterville, 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
1982-09-11 10:52:05 UTC
Depth
0.2 km (0.1 mi), shallow
Epicenter
48.207° N, 120.433° 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 7.6 km horizontally, 26.2 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
124°
Stations used
21

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 2 in the 30 days before it.

After

  1. 1.86 km NNW of Waterville, Washington · 16058 days ago · 4 km deep · 61 km away
  2. 2.44 km NNE of Entiat, Washington · 16050 days ago · 3 km deep · 58 km away
  3. 2.2Washington · 16050 days ago · 9 km deep · 52 km away
  4. 2.19 km SSE of Leavenworth, Washington · 16049 days ago · 6 km deep · 78 km away
  5. 2.63 km SW of Darrington, Washington · 16048 days ago · 1 km deep · 90 km away
  6. 1.66 km WSW of Entiat, Washington · 16048 days ago · 1 km deep · 62 km away
  7. 2.38 km NNW of Chelan, Washington · 16046 days ago · -1 km deep · 43 km away
  8. 1.66 km NW of Nespelem Community, Washington · 16045 days ago · 4 km deep · 99 km away
  9. 2.014 km N of May Creek, Washington · 16041 days ago · -1 km deep · 93 km away
  10. 2.315 km SE of Mansfield, Washington · 16039 days ago · 0 km deep · 89 km away
  11. 1.98 km WSW of Chelan Falls, Washington · 16028 days ago · 0 km deep · 56 km away

Before

  1. 2.225 km E of Darrington, Washington · 16096 days ago · 2 km deep · 62 km away
  2. 1.738 km NNW of Leavenworth, Washington · 16096 days ago · 10 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10143668. Read Wed, Sep 23, 2026, 6:25 PM UTC.