Idaho earthquakes

M1.8 earthquake 31 km ESE of Cascade, Idaho

A magnitude 1.8 earthquake struck 31 km ESE of Cascade, Idaho on Tue, Sep 8, 2015, 3:09 AM MDT (09:09 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M2.8 26 km W of Challis, Idaho. This one was a foreshock.

Cascade forecastMore in Idaho

Map

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

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The earthquake

Magnitude
1.8 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2015-09-08 09:09:48 UTC
Depth
12.7 km (7.9 mi), shallow
Epicenter
44.378° N, 115.691° 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 0.5 km horizontally, 1.3 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
107°
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: 12 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.524 km NW of Clayton, Idaho · 4039 days ago · 8 km deep · 82 km away
  2. 1.8southern Idaho · 4035 days ago · -1 km deep · 71 km away
  3. 2.013 km W of Clayton, Idaho · 4030 days ago · 9 km deep · 91 km away
  4. 1.513 km W of Clayton, Idaho · 4030 days ago · 10 km deep · 91 km away
  5. 1.914 km W of Clayton, Idaho · 4028 days ago · 6 km deep · 89 km away
  6. 2.826 km W of Challis, Idaho · 4028 days ago · 5 km deep · 91 km away
  7. 2.122 km WNW of Clayton, Idaho · 4011 days ago · 7 km deep · 83 km away
  8. 1.522 km WNW of Clayton, Idaho · 4011 days ago · 4 km deep · 83 km away
  9. 2.112 km NW of Smiths Ferry, Idaho · 3998 days ago · 5 km deep · 39 km away
  10. 2.110 km NNE of Stanley, Idaho · 3993 days ago · -1 km deep · 65 km away
  11. 2.411 km NNE of Stanley, Idaho · 3990 days ago · 8 km deep · 66 km away
  12. 2.313 km NW of Smiths Ferry, Idaho · 3983 days ago · 3 km deep · 42 km away

Before

  1. 2.525 km ESE of Cascade, Idaho · 4057 days ago · 9 km deep · 7 km away
  2. 1.68 km NE of Stanley, Idaho · 4062 days ago · 6 km deep · 66 km away
  3. 2.09 km NNE of Stanley, Idaho · 4062 days ago · 13 km deep · 65 km away
  4. 2.225 km ESE of Cascade, Idaho · 4065 days ago · 11 km deep · 7 km away
  5. 1.916 km SW of Donnelly, Idaho · 4066 days ago · 12 km deep · 49 km away
  6. 2.19 km NNE of Cascade, Idaho · 4067 days ago · 6 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80096999. Read Thu, Oct 1, 2026, 6:18 PM UTC.