QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4 km NE of Cascade, Idaho

· 15 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Valley County 46 kmAdams County 53 kmGem County 63 kmWashington County 65 kmBoise County 65 kmPayette County 85 kmCanyon County 117 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 2.1 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Valley County, 46 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2217 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 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 44.5418, -115.9902. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Valley County, ID 46 km (28 mi) SW of here earthquakes near Valley County
Adams County, ID 53 km (33 mi) SE of here earthquakes near Adams County
Gem County, ID 63 km (39 mi) NNE of here earthquakes near Gem County
Washington County, ID 65 km (40 mi) E of here earthquakes near Washington County
Boise County, ID 65 km (41 mi) NNW of here earthquakes near Boise County
Payette County, ID 85 km (53 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. 3.1 6 km NNW of Smiths Ferry, Idaho
  2. 2.0 6 km WNW of Smiths Ferry, Idaho
  3. 2.1 2 km N of Smiths Ferry, Idaho
  4. 1.8 38 km N of Lowman, Idaho
  5. 2.2 7 km W of Smiths Ferry, Idaho
  6. 2.1 4 km NNW of Cascade, Idaho
  7. 2.2 31 km NNE of Lowman, Idaho
  8. 1.7 8 km WNW of Smiths Ferry, Idaho
  9. 1.7 14 km NW of Cascade, Idaho
  10. 1.9 24 km E of Smiths Ferry, Idaho
  11. 1.8 23 km E of Smiths Ferry, Idaho
  12. 1.9 7 km WNW of Smiths Ferry, Idaho
  13. 2.2 8 km WNW of Smiths Ferry, Idaho
  14. 2.2 7 km WNW of Smiths Ferry, Idaho
  15. 2.4 7 km WNW 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

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