QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

13 km WNW of Stanley, Idaho

· 7.0 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boise County 61 kmCuster County 66 kmValley County 77 kmCamas County 90 kmElmore County 104 kmGem County 108 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
7.0 km below the surface
Felt
no reports yet
Nearest
Boise County, 61 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1790 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 44.2847, -115.0790. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Boise County, ID 61 km (38 mi) ENE of here earthquakes near Boise County
Custer County, ID 66 km (41 mi) W of here earthquakes near Custer County
Valley County, ID 77 km (48 mi) SE of here earthquakes near Valley County
Camas County, ID 90 km (56 mi) NNW of here earthquakes near Camas County
Elmore County, ID 104 km (65 mi) NNE of here earthquakes near Elmore County
Gem County, ID 108 km (67 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. 2.2 22 km WNW of Stanley, Idaho
  2. 2.4 30 km NW of Stanley, Idaho
  3. 2.5 22 km WNW of Stanley, Idaho
  4. 1.6 20 km WNW of Stanley, Idaho
  5. 2.6 23 km WNW of Stanley, Idaho
  6. 1.9 22 km WNW of Stanley, Idaho
  7. 2.2 southern Idaho
  8. 2.0 23 km WNW of Stanley, Idaho
  9. 2.6 19 km WNW of Stanley, Idaho
  10. 1.8 35 km NW of Stanley, Idaho
  11. 2.1 20 km WNW of Stanley, Idaho
  12. 1.7 23 km WNW of Stanley, Idaho
  13. 2.4 23 km WNW of Stanley, Idaho
  14. 1.9 22 km WNW of Stanley, Idaho
  15. 1.9 22 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 4,100,000 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.