QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

8 km ESE of Challis, Idaho

· 6.6 km deep · released about 5.9 lb of TNT

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10 km30 km60 km120 km N Custer County 23 kmLemhi County 55 kmButte County 116 kmCamas County 118 kmBlaine County 120 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.5 (ml)
Depth
6.6 km below the surface
Felt
no reports yet
Nearest
Custer County, 23 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 982 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 44.4633, -114.1353. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 23 km (14 mi) NNE of here earthquakes near Custer County
Lemhi County, ID 55 km (34 mi) SSW of here earthquakes near Lemhi County
Butte County, ID 116 km (72 mi) NW of here earthquakes near Butte County
Camas County, ID 118 km (74 mi) NNE of here earthquakes near Camas County
Blaine County, ID 120 km (74 mi) N of here earthquakes near Blaine County
Beaverhead County, MT 123 km (77 mi) SW of here earthquakes near Beaverhead County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

59 earthquakes have been recorded within 50 km since this one.

  1. 1.9 32 km NW of Mackay, Idaho
  2. 2.1 32 km NNW of Challis, Idaho
  3. 1.6 21 km WSW of Challis, Idaho
  4. 2.1 20 km NNW of Challis, Idaho
  5. 1.5 21 km NNW of Challis, Idaho
  6. 1.8 7 km NNW of Challis, Idaho
  7. 2.7 10 km NNW of Challis, Idaho
  8. 2.0 8 km NNW of Challis, Idaho
  9. 1.7 5 km NNW of Challis, Idaho
  10. 1.7 6 km NNW of Challis, Idaho
  11. 2.5 20 km NNW of Clayton, Idaho
  12. 1.7 34 km NNW of Challis, Idaho
  13. 2.6 21 km WSW of Challis, Idaho
  14. 1.9 21 km WSW of Challis, Idaho
  15. 2.0 21 km WSW of Challis, Idaho

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.