Idaho earthquakes

M2.5 earthquake 25 km ESE of Cascade, Idaho

A magnitude 2.5 earthquake struck 25 km ESE of Cascade, Idaho on Sun, Aug 23, 2015, 6:41 PM MDT (00:41 UTC), 9 km (5 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
2.5 (ml), micro
Local time
UTC
2015-08-24 00:41:07 UTC
Depth
8.5 km (5.3 mi), shallow
Epicenter
44.399° N, 115.768° 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.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 2.1 km horizontally, 6.9 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
32°
Stations used
48

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 1.831 km ESE of Cascade, Idaho · 4033 days ago · 13 km deep · 7 km away
  2. 2.524 km NW of Clayton, Idaho · 4031 days ago · 8 km deep · 88 km away
  3. 1.8southern Idaho · 4027 days ago · -1 km deep · 68 km away
  4. 2.013 km W of Clayton, Idaho · 4022 days ago · 9 km deep · 97 km away
  5. 1.513 km W of Clayton, Idaho · 4022 days ago · 10 km deep · 97 km away
  6. 1.914 km W of Clayton, Idaho · 4020 days ago · 6 km deep · 96 km away
  7. 2.826 km W of Challis, Idaho · 4020 days ago · 5 km deep · 97 km away
  8. 2.122 km WNW of Clayton, Idaho · 4003 days ago · 7 km deep · 89 km away
  9. 1.522 km WNW of Clayton, Idaho · 4003 days ago · 4 km deep · 89 km away
  10. 2.112 km NW of Smiths Ferry, Idaho · 3990 days ago · 5 km deep · 33 km away

Before

  1. 1.68 km NE of Stanley, Idaho · 4054 days ago · 6 km deep · 73 km away
  2. 2.09 km NNE of Stanley, Idaho · 4054 days ago · 13 km deep · 72 km away
  3. 2.225 km ESE of Cascade, Idaho · 4057 days ago · 11 km deep · 5 km away
  4. 1.916 km SW of Donnelly, Idaho · 4057 days ago · 12 km deep · 43 km away
  5. 2.19 km NNE of Cascade, Idaho · 4059 days ago · 6 km deep · 27 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us100034dy (also filed as mb15003397). Read Wed, Sep 23, 2026, 1:14 PM UTC.