QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

8 km WNW of Smiths Ferry, Idaho

· 7.5 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gem County 33 kmWashington County 50 kmBoise County 53 kmPayette County 57 kmAdams County 66 kmValley County 75 kmCanyon County 88 kmAda County 97 kmElmore County 118 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
7.5 km below the surface
Felt
no reports yet
Nearest
Gem County, 33 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1252 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 44.3198, -116.1908. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gem County, ID 33 km (21 mi) NNE of here earthquakes near Gem County
Washington County, ID 50 km (31 mi) ESE of here earthquakes near Washington County
Boise County, ID 53 km (33 mi) NW of here earthquakes near Boise County
Payette County, ID 57 km (35 mi) NE of here earthquakes near Payette County
Adams County, ID 66 km (41 mi) SSE of here earthquakes near Adams County
Valley County, ID 75 km (47 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

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

  1. 3.5 8 km N of Smiths Ferry, Idaho
  2. 2.0 7 km NNW of Smiths Ferry, Idaho
  3. 2.9 8 km NNW of Smiths Ferry, Idaho
  4. 2.1 7 km N of Smiths Ferry, Idaho
  5. 2.4 6 km NNW of Smiths Ferry, Idaho
  6. 2.1 6 km NNW of Smiths Ferry, Idaho
  7. 2.4 7 km N of Smiths Ferry, Idaho
  8. 3.5 8 km N of Smiths Ferry, Idaho
  9. 2.3 8 km NNW of Smiths Ferry, Idaho
  10. 1.9 8 km NNW of Smiths Ferry, Idaho
  11. 2.3 8 km NNW of Smiths Ferry, Idaho
  12. 2.3 7 km NNW of Smiths Ferry, Idaho
  13. 2.2 9 km N of Smiths Ferry, Idaho
  14. 1.6 7 km NNW of Smiths Ferry, Idaho
  15. 2.7 11 km NW 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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