Idaho earthquakes

M1.6 earthquake 14 km W of Portage, Utah

A magnitude 1.6 earthquake struck 14 km W of Portage, Utah on Tue, Feb 5, 1985, 4:14 AM MST (11:14 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.0 13 km W of Portage, Utah. This one was a foreshock.

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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
1985-02-05 11:14:27 UTC
Depth
4.3 km (2.7 mi), shallow
Epicenter
41.975° N, 112.412° W
Region
Idaho
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, 1.8 km in depth
Depth from
From location
Station coverage gap
101°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.013 km W of Portage, Utah · 15202 days ago · 6 km deep · 1 km away
  2. 2.11 km W of Bennington, Idaho · 15193 days ago · 12 km deep · 100 km away
  3. 2.513 km SSW of Grace, Idaho · 15186 days ago · 10 km deep · 74 km away
  4. 1.812 km S of Snowville, Utah · 15166 days ago · 6 km deep · 27 km away
  5. 1.5Utah · 15162 days ago · 2 km deep · 8 km away
  6. 1.513 km S of Snowville, Utah · 15158 days ago · 2 km deep · 27 km away
  7. 2.719 km WSW of Georgetown, Idaho · 15146 days ago · 4 km deep · 83 km away

Before

  1. 2.113 km W of Portage, Utah · 15205 days ago · 5 km deep · 1 km away
  2. 1.63 km NE of Oxford, Idaho · 15209 days ago · 1 km deep · 49 km away
  3. 2.511 km NW of Howell, Utah · 15211 days ago · 3 km deep · 15 km away
  4. 1.514 km NNW of Howell, Utah · 15213 days ago · 1 km deep · 13 km away
  5. 3.012 km NW of Howell, Utah · 15213 days ago · 4 km deep · 14 km away
  6. 2.712 km NNW of Howell, Utah · 15214 days ago · 4 km deep · 13 km away
  7. 2.316 km N of Howell, Utah · 15215 days ago · 3 km deep · 5 km away
  8. 1.613 km NNW of Howell, Utah · 15215 days ago · 0 km deep · 13 km away
  9. 1.614 km NNW of Howell, Utah · 15216 days ago · 0 km deep · 12 km away
  10. 1.616 km NNW of Howell, Utah · 15216 days ago · 2 km deep · 10 km away
  11. 1.810 km W of Bennington, Idaho · 15230 days ago · 3 km deep · 92 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu50019005. Read Tue, Sep 22, 2026, 9:38 PM UTC.