QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

7 km N of Smiths Ferry, Idaho

· 6.8 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gem County 41 kmBoise County 53 kmWashington County 56 kmAdams County 63 kmPayette County 65 kmValley County 67 kmCanyon County 96 kmAda County 102 kmElmore 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 2.1 (ml)
Depth
6.8 km below the surface
Felt
no reports yet
Nearest
Gem County, 41 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 887 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 44.3680, -116.1077. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gem County, ID 41 km (26 mi) NE of here earthquakes near Gem County
Boise County, ID 53 km (33 mi) NW of here earthquakes near Boise County
Washington County, ID 56 km (35 mi) E of here earthquakes near Washington County
Adams County, ID 63 km (39 mi) SSE of here earthquakes near Adams County
Payette County, ID 65 km (41 mi) NE of here earthquakes near Payette County
Valley County, ID 67 km (41 mi) SW of here earthquakes near Valley County

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

Aftershocks so far

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

  1. 1.8 6 km NNW of Smiths Ferry, Idaho
  2. 1.7 6 km NNW of Smiths Ferry, Idaho
  3. 2.4 17 km WSW of Cascade, Idaho
  4. 2.0 16 km WSW of Cascade, Idaho
  5. 2.3 7 km NNW of Smiths Ferry, Idaho
  6. 2.0 9 km NW of Smiths Ferry, Idaho
  7. 2.1 7 km N of Smiths Ferry, Idaho
  8. 1.6 6 km NNW of Smiths Ferry, Idaho
  9. 2.3 6 km NNW of Smiths Ferry, Idaho
  10. 2.7 6 km NNW of Smiths Ferry, Idaho
  11. 2.1 6 km N of Smiths Ferry, Idaho
  12. 1.8 6 km NNW of Smiths Ferry, Idaho
  13. 2.1 3 km SSE of Cascade, Idaho
  14. 1.8 6 km NNW of Smiths Ferry, Idaho
  15. 1.9 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.9 on 2024-02-26 — it released about 15,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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