Oregon earthquakes

M1.8 earthquake 5 km SSW of Aloha, Oregon

A magnitude 1.8 earthquake struck 5 km SSW of Aloha, Oregon on Tue, Feb 5, 1991, 2:13 AM PST (10:13 UTC), 37 km (23 mi) below the surface.

A larger quake followed: M3.1 5 km ESE of Ridgefield, Washington. This one was a foreshock.

Aloha 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
1991-02-05 10:13:03 UTC
Depth
37.4 km (23.2 mi), shallow
Epicenter
45.450° N, 122.886° 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 0.8 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
171°
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: 13 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 1.737 km NNE of Amboy, Washington · 13024 days ago · -1 km deep · 99 km away
  2. 1.67 km ENE of Government Camp, Oregon · 13017 days ago · 4 km deep · 96 km away
  3. 1.537 km NE of Amboy, Washington · 13016 days ago · -2 km deep · 99 km away
  4. 1.836 km NNE of Amboy, Washington · 13016 days ago · 0 km deep · 98 km away
  5. 1.538 km NNE of Amboy, Washington · 13008 days ago · 0 km deep · 100 km away
  6. 2.23 km N of North Portland, Oregon · 13006 days ago · 14 km deep · 25 km away
  7. 1.71 km NNE of Mill Plain, Washington · 13005 days ago · 11 km deep · 38 km away
  8. 3.15 km ESE of Ridgefield, Washington · 12997 days ago · 19 km deep · 41 km away
  9. 1.75 km ESE of Ridgefield, Washington · 12988 days ago · 19 km deep · 41 km away
  10. 1.97 km ESE of Venersborg, Washington · 12982 days ago · 4 km deep · 54 km away
  11. 1.55 km NE of Estacada, Oregon · 12981 days ago · 16 km deep · 49 km away
  12. 1.835 km NNE of Amboy, Washington · 12980 days ago · -1 km deep · 97 km away
  13. 1.636 km NNE of Amboy, Washington · 12980 days ago · -1 km deep · 98 km away

Before

  1. 1.637 km NNE of Amboy, Washington · 13026 days ago · -1 km deep · 99 km away
  2. 1.511 km ESE of Yacolt, Washington · 13027 days ago · 8 km deep · 63 km away
  3. 1.822 km NNW of Carson, Washington · 13033 days ago · 6 km deep · 86 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10269138. Read Sun, Oct 4, 2026, 8:16 AM UTC.