Utah earthquakes

M3.1 earthquake 12 km WNW of Helper, Utah

A magnitude 3.1 earthquake struck 12 km WNW of Helper, Utah on Wed, Oct 29, 1986, 5:05 PM MST (00:05 UTC), 5 km (3 mi) below the surface.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.1 (Md, duration), minor
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
1986-10-30 00:05:43 UTC
Depth
4.7 km (2.9 mi), shallow
Epicenter
39.745° N, 110.975° W
Region
Utah
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 1.9 km horizontally, 8.3 km in depth
Depth from
From location
Station coverage gap
194°, poorly surrounded by stations
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: 11 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 1.820 km W of Nephi, Utah · 14579 days ago · 4 km deep · 94 km away
  2. 1.716 km NNW of Fayette, Utah · 14574 days ago · 15 km deep · 90 km away
  3. 1.917 km NNW of Fayette, Utah · 14568 days ago · 12 km deep · 90 km away
  4. 2.814 km W of Huntington, Utah · 14553 days ago · 3 km deep · 46 km away
  5. 3.114 km WNW of Huntington, Utah · 14553 days ago · 3 km deep · 45 km away
  6. 1.98 km NNW of Orangeville, Utah · 14540 days ago · 8 km deep · 51 km away
  7. 1.62 km SW of Rocky Ridge, Utah · 14536 days ago · 7 km deep · 77 km away
  8. 2.78 km NW of Helper, Utah · 14530 days ago · 6 km deep · 4 km away
  9. 2.414 km W of Huntington, Utah · 14529 days ago · 3 km deep · 46 km away
  10. 2.53 km NNW of Kenilworth, Utah · 14526 days ago · 6 km deep · 14 km away
  11. 1.83 km NNW of Rocky Ridge, Utah · 14524 days ago · 0 km deep · 78 km away

Before

  1. 1.77 km SSE of Saratoga Springs, Utah · 14581 days ago · 3 km deep · 97 km away
  2. 2.47 km E of Sunnyside, Utah · 14594 days ago · 5 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu50030465. Read Thu, Oct 1, 2026, 6:22 AM UTC.