Idaho earthquakes

M2.2 earthquake 25 km ESE of Cascade, Idaho

A magnitude 2.2 earthquake struck 25 km ESE of Cascade, Idaho on Sat, Aug 15, 2015, 9:29 AM MDT (15:29 UTC), 11 km (7 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

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
2.2 (mc), micro
Local time
UTC
2015-08-15 15:29:01 UTC
Depth
11.2 km (7.0 mi), shallow
Epicenter
44.435° N, 115.740° W
Region
Idaho
Tsunami flag
No
Status
Automatic solution, may be revised

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

An automatic solution; a seismologist may revise it.

Location uncertainty
About 1.9 km horizontally, 2.8 km in depth
Magnitude uncertainty
±0.50
Station coverage gap
104°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 2.09 km NNE of Stanley, Idaho · 4060 days ago · 13 km deep · 71 km away
  2. 1.68 km NE of Stanley, Idaho · 4060 days ago · 6 km deep · 71 km away
  3. 2.525 km ESE of Cascade, Idaho · 4055 days ago · 9 km deep · 5 km away
  4. 2.138 km NE of Yellow Pine, Idaho · 4043 days ago · 5 km deep · 97 km away
  5. 2.236 km NE of Yellow Pine, Idaho · 4043 days ago · 11 km deep · 97 km away
  6. 1.831 km ESE of Cascade, Idaho · 4039 days ago · 13 km deep · 7 km away
  7. 2.524 km NW of Clayton, Idaho · 4037 days ago · 8 km deep · 86 km away
  8. 1.8southern Idaho · 4033 days ago · -1 km deep · 73 km away
  9. 2.013 km W of Clayton, Idaho · 4028 days ago · 9 km deep · 96 km away
  10. 1.513 km W of Clayton, Idaho · 4028 days ago · 10 km deep · 96 km away
  11. 1.914 km W of Clayton, Idaho · 4026 days ago · 6 km deep · 94 km away
  12. 2.826 km W of Challis, Idaho · 4026 days ago · 5 km deep · 94 km away
  13. 2.122 km WNW of Clayton, Idaho · 4009 days ago · 7 km deep · 88 km away
  14. 1.522 km WNW of Clayton, Idaho · 4009 days ago · 4 km deep · 87 km away

Before

  1. 1.916 km SW of Donnelly, Idaho · 4064 days ago · 12 km deep · 43 km away
  2. 2.19 km NNE of Cascade, Idaho · 4065 days ago · 6 km deep · 26 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb15290303. Read Tue, Sep 29, 2026, 6:52 PM UTC.