Idaho earthquakes

M1.5 earthquake 17 km WSW of Challis, Idaho

A magnitude 1.5 earthquake struck 17 km WSW of Challis, Idaho on Sat, Aug 12, 2017, 3:37 PM MDT (21:37 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M2.6 southern Idaho. This one was a foreshock.

Challis 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
1.5 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2017-08-12 21:37:55 UTC
Depth
7.7 km (4.8 mi), shallow
Epicenter
44.471° N, 114.448° 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 0.9 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
105°
Stations used
9

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 4 in the 30 days before it.

After

  1. 1.910 km NW of Challis, Idaho · 3335 days ago · 5 km deep · 17 km away
  2. 1.914 km W of Clayton, Idaho · 3329 days ago · 5 km deep · 25 km away
  3. 2.09 km NNE of Challis, Idaho · 3325 days ago · 10 km deep · 25 km away
  4. 1.514 km W of Clayton, Idaho · 3323 days ago · 4 km deep · 25 km away
  5. 1.615 km WSW of Challis, Idaho · 3309 days ago · 7 km deep · 4 km away
  6. 1.911 km W of Clayton, Idaho · 3306 days ago · 10 km deep · 25 km away
  7. 2.19 km N of Stanley, Idaho · 3298 days ago · 10 km deep · 42 km away
  8. 2.18 km N of Stanley, Idaho · 3297 days ago · 4 km deep · 43 km away
  9. 2.6southern Idaho · 3292 days ago · 5 km deep · 32 km away · felt by 1
  10. 1.614 km W of Clayton, Idaho · 3283 days ago · 4 km deep · 26 km away

Before

  1. 2.425 km WNW of Challis, Idaho · 3339 days ago · 4 km deep · 16 km away
  2. 1.723 km ESE of Stanley, Idaho · 3360 days ago · 10 km deep · 44 km away
  3. 1.55 km SE of Salmon, Idaho · 3361 days ago · 7 km deep · 89 km away
  4. 2.513 km ESE of Stanley, Idaho · 3363 days ago · 5 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80244444. Read Fri, Oct 2, 2026, 11:17 AM UTC.