QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

16 km WNW of Stanley, Idaho

· 20 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boise County 57 kmCuster County 70 kmValley County 75 kmCamas County 91 kmElmore County 102 kmGem County 104 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
20 km below the surface
Felt
no reports yet
Nearest
Boise County, 57 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1875 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 44.2798, -115.1268. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Boise County, ID 57 km (35 mi) NE of here earthquakes near Boise County
Custer County, ID 70 km (43 mi) W of here earthquakes near Custer County
Valley County, ID 75 km (47 mi) SSE of here earthquakes near Valley County
Camas County, ID 91 km (57 mi) NNW of here earthquakes near Camas County
Elmore County, ID 102 km (64 mi) NNE of here earthquakes near Elmore County
Gem County, ID 104 km (65 mi) ENE of here earthquakes near Gem 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 13 km NE of Stanley, Idaho
  2. 2.2 13 km ENE of Stanley, Idaho
  3. 2.8 16 km NE of Stanley, Idaho
  4. 2.4 8 km N of Stanley, Idaho
  5. 1.9 6 km NNE of Stanley, Idaho
  6. 2.4 8 km NNW of Stanley, Idaho
  7. 2.0 southern Idaho
  8. 1.8 6 km NNE of Stanley, Idaho
  9. 1.8 6 km N of Stanley, Idaho
  10. 1.8 6 km NNE of Stanley, Idaho
  11. 2.0 21 km WNW of Stanley, Idaho
  12. 2.0 12 km NW of Stanley, Idaho
  13. 2.0 21 km WNW of Stanley, Idaho
  14. 2.2 24 km NW of Stanley, Idaho
  15. 2.0 23 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 4,300,000 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.