QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mwr

18 km SW of Stanley, Idaho

· 10 km deep · released about 21 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boise County 52 kmCuster County 69 kmCamas County 70 kmElmore County 84 kmValley County 95 kmGem County 105 kmAda County 117 kmBlaine County 119 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 4.1 (mwr)
Depth
10 km below the surface
Felt
37 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Boise County, 52 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2199 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 37 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× more

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 44.0919, -115.0844. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Boise County, ID 52 km (32 mi) ENE of here earthquakes near Boise County
Custer County, ID 69 km (43 mi) WSW of here earthquakes near Custer County
Camas County, ID 70 km (44 mi) NNW of here earthquakes near Camas County
Elmore County, ID 84 km (52 mi) NNE of here earthquakes near Elmore County
Valley County, ID 95 km (59 mi) SSE of here earthquakes near Valley County
Gem County, ID 105 km (65 mi) E of here earthquakes near Gem County

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

Aftershocks so far

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

  1. 2.0 11 km NW of Stanley, Idaho
  2. 1.7 35 km NW of Stanley, Idaho
  3. 2.6 34 km NW of Stanley, Idaho
  4. 2.4 17 km SW of Stanley, Idaho
  5. 2.2 27 km WNW of Stanley, Idaho
  6. 2.1 20 km WNW of Stanley, Idaho
  7. 1.8 15 km SW of Stanley, Idaho
  8. 2.4 12 km SW of Stanley, Idaho
  9. 2.8 6 km E of Stanley, Idaho
  10. 2.4 7 km ENE of Stanley, Idaho
  11. 2.6 25 km NW of Stanley, Idaho
  12. 2.4 25 km NW of Stanley, Idaho
  13. 1.6 21 km WNW of Stanley, Idaho
  14. 2.5 32 km NW of Stanley, Idaho
  15. 2.5 23 km NW 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 4,000 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.