QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

31 km NW of Stanley, Idaho

· 13 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Valley County 58 kmBoise County 63 kmCuster County 78 kmGem County 103 kmCamas County 108 kmAdams County 112 kmElmore County 116 kmLemhi 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 2.1 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Valley County, 58 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1245 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 44.4222, -115.2047. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Valley County, ID 58 km (36 mi) SE of here earthquakes near Valley County
Boise County, ID 63 km (39 mi) NE of here earthquakes near Boise County
Custer County, ID 78 km (48 mi) WNW of here earthquakes near Custer County
Gem County, ID 103 km (64 mi) ENE of here earthquakes near Gem County
Camas County, ID 108 km (67 mi) NNW of here earthquakes near Camas County
Adams County, ID 112 km (69 mi) ESE of here earthquakes near Adams 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. 2.0 23 km WNW of Stanley, Idaho
  2. 1.8 38 km NNW of Stanley, Idaho
  3. 2.0 23 km NW of Stanley, Idaho
  4. 1.8 23 km NW of Stanley, Idaho
  5. 1.8 23 km WNW of Stanley, Idaho
  6. 2.7 21 km NW of Stanley, Idaho
  7. 2.0 19 km WNW of Stanley, Idaho
  8. 2.8 southern Idaho
  9. 2.3 southern Idaho
  10. 2.4 13 km WNW of Stanley, Idaho
  11. 2.2 southern Idaho
  12. 2.3 40 km NW of Stanley, Idaho
  13. 2.4 southern Idaho
  14. 1.9 19 km WNW of Stanley, Idaho
  15. 2.1 20 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 6.5 on 2020-03-31 — it released about 3,300,000 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.