QuakeIndex

Earthquake · reviewed by a seismologist

M 4.6mwr

27 km NW of Stanley, Idaho

· 7.5 km deep · released about 120 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Valley County 61 kmBoise County 62 kmCuster County 75 kmGem County 104 kmCamas County 105 kmElmore County 114 kmAdams County 114 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 4.6 (mwr)
Depth
7.5 km below the surface
Felt
1752 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Valley County, 61 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2180 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1752 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 1,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 63× the energy of this one
  3. Magna, Utah 2020 M 5.7 45× the energy of this one
  4. This earthquake M 4.6 about 120 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 250× 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 44.3989, -115.1814. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Valley County, ID 61 km (38 mi) SE of here earthquakes near Valley County
Boise County, ID 62 km (39 mi) NE of here earthquakes near Boise County
Custer County, ID 75 km (47 mi) W of here earthquakes near Custer County
Gem County, ID 104 km (65 mi) ENE of here earthquakes near Gem County
Camas County, ID 105 km (65 mi) NNW of here earthquakes near Camas County
Elmore County, ID 114 km (71 mi) NNE of here earthquakes near Elmore 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 southern Idaho
  2. 2.4 15 km SW of Stanley, Idaho
  3. 2.0 17 km NW of Stanley, Idaho
  4. 3.6 15 km SW of Stanley, Idaho
  5. 2.4 23 km WNW of Stanley, Idaho
  6. 2.5 24 km NW of Stanley, Idaho
  7. 2.3 27 km NW of Stanley, Idaho
  8. 2.4 27 km WNW of Stanley, Idaho
  9. 1.6 28 km NW of Stanley, Idaho
  10. 2.3 28 km NW of Stanley, Idaho
  11. 1.9 27 km N of Lowman, Idaho
  12. 2.3 28 km NNW of Lowman, Idaho
  13. 3.0 35 km NNW of Stanley, Idaho
  14. 1.7 8 km NW of Stanley, ID
  15. 2.4 25 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 710 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.