QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

24 km E of Smiths Ferry, Idaho

· 0.3 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boise County 37 kmGem County 57 kmValley County 62 kmWashington County 82 kmAdams County 83 kmPayette County 85 kmAda County 103 kmElmore County 105 kmCanyon County 106 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 1.9 (ml)
Depth
0.3 km below the surface
Felt
no reports yet
Nearest
Boise County, 37 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2004 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 44.3132, -115.7828. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Boise County, ID 37 km (23 mi) N of here earthquakes near Boise County
Gem County, ID 57 km (35 mi) ENE of here earthquakes near Gem County
Valley County, ID 62 km (38 mi) SSW of here earthquakes near Valley County
Washington County, ID 82 km (51 mi) E of here earthquakes near Washington County
Adams County, ID 83 km (51 mi) SE of here earthquakes near Adams County
Payette County, ID 85 km (53 mi) ENE of here earthquakes near Payette County

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

Aftershocks so far

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

  1. 2.6 southern Idaho
  2. 2.4 6 km W of Smiths Ferry, Idaho
  3. 1.8 40 km NW of Stanley, Idaho
  4. 2.2 35 km NW of Stanley, Idaho
  5. 2.6 28 km NW of Stanley, Idaho
  6. 2.4 31 km NW of Stanley, Idaho
  7. 2.0 5 km WNW of Cascade, Idaho
  8. 3.1 30 km WNW of Stanley, Idaho
  9. 2.3 28 km WNW of Stanley, Idaho
  10. 2.7 38 km NW of Stanley, Idaho
  11. 2.1 6 km NNE of Smiths Ferry, Idaho
  12. 2.4 7 km W of Smiths Ferry, Idaho
  13. 2.3 26 km WNW of Stanley, Idaho
  14. 2.4 27 km WNW of Stanley, Idaho
  15. 2.1 25 km WNW of Stanley, 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 4.0 on 2020-11-06 — it released about 1,400 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.