Washington earthquakes

M1.8 earthquake 10 km NNW of Mansfield, Washington

A magnitude 1.8 earthquake struck 10 km NNW of Mansfield, Washington on Sat, Jan 20, 1979, 2:31 AM PST (10:31 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.0 Washington. This one was a foreshock.

Bridgeport 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
1979-01-20 10:31:11 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
47.905° N, 119.672° 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 0.7 km horizontally, 4.0 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
106°
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 2.1Washington · 17418 days ago · 5 km deep · 1 km away
  2. 3.0Washington · 17417 days ago · 4 km deep · 1 km away
  3. 3.04 km WNW of Waterville, Washington · 17408 days ago · 6 km deep · 43 km away
  4. 2.810 km NNW of Mansfield, Washington · 17402 days ago · 5 km deep · 1 km away
  5. 1.81 km SW of Entiat, Washington · 17393 days ago · 0 km deep · 49 km away
  6. 1.846 km WNW of Granite Falls, Washington · 17390 days ago · 0 km deep · 83 km away
  7. 1.912 km SSW of Marlin, Washington · 17379 days ago · 1 km deep · 82 km away
  8. 1.67 km WSW of Entiat, Washington · 17366 days ago · 2 km deep · 54 km away
  9. 1.815 km W of Entiat, Washington · 17364 days ago · -1 km deep · 61 km away
  10. 1.610 km NNW of Mansfield, Washington · 17363 days ago · 4 km deep · 1 km away

Before

  1. 2.110 km S of Bridgeport, Washington · 17419 days ago · 6 km deep · 1 km away
  2. 1.710 km NNW of Mansfield, Washington · 17419 days ago · 4 km deep · 1 km away
  3. 2.710 km NNW of Mansfield, Washington · 17419 days ago · 5 km deep · 1 km away
  4. 3.910 km NNW of Mansfield, Washington · 17420 days ago · 6 km deep · 1 km away
  5. 1.713 km WSW of Conconully, Washington · 17434 days ago · 0 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10848768. Read Tue, Sep 29, 2026, 3:03 AM UTC.