Oregon earthquakes

M1.8 earthquake 8 km N of Bethany, Oregon

A magnitude 1.8 earthquake struck 8 km N of Bethany, Oregon on Mon, Oct 21, 1991, 11:03 PM PDT (06:03 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M2.5 4 km WSW of Mill Plain, Washington. This one was a foreshock.

Bethany forecastMore in Oregon

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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-10-22 06:03:55 UTC
Depth
19.0 km (11.8 mi), shallow
Epicenter
45.635° N, 122.867° W
Region
Oregon
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 0.5 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
77°
Stations used
35

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 14 in the 30 days before it.

After

  1. 1.610 km NE of North Plains, Oregon · 12764 days ago · 17 km deep · 2 km away
  2. 2.18 km N of Bethany, Oregon · 12764 days ago · 20 km deep · 1 km away
  3. 1.64 km SW of Mill Plain, Washington · 12752 days ago · 18 km deep · 26 km away
  4. 2.54 km WSW of Mill Plain, Washington · 12752 days ago · 15 km deep · 25 km away
  5. 1.84 km S of Orchards, Washington · 12752 days ago · 15 km deep · 25 km away
  6. 1.94 km S of Orchards, Washington · 12752 days ago · 13 km deep · 24 km away
  7. 1.94 km WSW of Mill Plain, Washington · 12751 days ago · 16 km deep · 25 km away
  8. 1.83 km S of Orchards, Washington · 12750 days ago · 19 km deep · 24 km away
  9. 1.81 km NE of Canby, Oregon · 12746 days ago · 25 km deep · 43 km away
  10. 1.829 km SSE of Mossyrock, Washington · 12716 days ago · 6 km deep · 80 km away
  11. 1.738 km NNE of Amboy, Washington · 12705 days ago · 2 km deep · 82 km away

Before

  1. 3.08 km N of Bethany, Oregon · 12765 days ago · 20 km deep · 2 km away
  2. 1.79 km N of Bethany, Oregon · 12766 days ago · 19 km deep · 1 km away
  3. 2.88 km N of Bethany, Oregon · 12768 days ago · 18 km deep · 0 km away
  4. 1.79 km N of Bethany, Oregon · 12768 days ago · 20 km deep · 1 km away
  5. 1.58 km N of Bethany, Oregon · 12768 days ago · 19 km deep · 0 km away
  6. 3.18 km ENE of North Plains, Oregon · 12768 days ago · 20 km deep · 2 km away
  7. 1.78 km N of Bethany, Oregon · 12768 days ago · 18 km deep · 1 km away
  8. 1.57 km W of Deer Island, Oregon · 12778 days ago · 23 km deep · 33 km away
  9. 1.93 km WSW of Falls City, Oregon · 12778 days ago · 21 km deep · 99 km away
  10. 1.938 km NNE of Amboy, Washington · 12784 days ago · -1 km deep · 82 km away
  11. 2.127 km SSE of Mossyrock, Washington · 12788 days ago · 0 km deep · 86 km away
  12. 2.338 km NNE of Amboy, Washington · 12791 days ago · -2 km deep · 82 km away
  13. 2.538 km NNE of Amboy, Washington · 12792 days ago · -2 km deep · 82 km away
  14. 1.923 km S of Morton, Washington · 12793 days ago · 9 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10282753. Read Fri, Oct 2, 2026, 11:44 AM UTC.