QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

10 km NNW of Cascade, Idaho

· 10 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adams County 42 kmValley County 47 kmWashington County 58 kmGem County 64 kmBoise County 74 kmPayette County 84 kmCanyon County 119 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 1.8 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Adams County, 42 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 44.5978, -116.0952. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Adams County, ID 42 km (26 mi) SE of here earthquakes near Adams County
Valley County, ID 47 km (29 mi) SW of here earthquakes near Valley County
Washington County, ID 58 km (36 mi) ENE of here earthquakes near Washington County
Gem County, ID 64 km (40 mi) NNE of here earthquakes near Gem County
Boise County, ID 74 km (46 mi) NNW of here earthquakes near Boise County
Payette County, ID 84 km (52 mi) NE of here earthquakes near Payette County

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

Aftershocks so far

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

  1. 1.7 8 km NNW of Smiths Ferry, Idaho
  2. 2.2 8 km NNW of Smiths Ferry, Idaho
  3. 1.9 8 km NNW of Smiths Ferry, Idaho
  4. 1.6 9 km NNW of Smiths Ferry, Idaho
  5. 2.4 7 km NNW of Smiths Ferry, Idaho
  6. 2.1 7 km NNW of Smiths Ferry, Idaho
  7. 2.2 8 km NNW of Smiths Ferry, Idaho
  8. 2.4 8 km N of Smiths Ferry, Idaho
  9. 3.0 7 km NNW of Smiths Ferry, Idaho
  10. 2.4 8 km NNW of Smiths Ferry, Idaho
  11. 2.3 8 km N of Smiths Ferry, Idaho
  12. 2.1 7 km NNW of Smiths Ferry, Idaho
  13. 2.2 7 km NNW of Smiths Ferry, Idaho
  14. 2.5 7 km NNW of Smiths Ferry, Idaho
  15. 1.7 7 km N of Smiths Ferry, 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.