QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

9 km N of Stanley, Idaho

· 10 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 55 kmBoise County 71 kmValley County 82 kmCamas County 90 kmLemhi County 109 kmElmore County 110 kmGem 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 3.1 (ml)
Depth
10 km below the surface
Felt
9 reports · strongest reported intensity III
Nearest
Custer County, 55 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1584 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 9 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 44.3019, -114.9398. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 55 km (34 mi) W of here earthquakes near Custer County
Boise County, ID 71 km (44 mi) ENE of here earthquakes near Boise County
Valley County, ID 82 km (51 mi) SE of here earthquakes near Valley County
Camas County, ID 90 km (56 mi) N of here earthquakes near Camas County
Lemhi County, ID 109 km (67 mi) SW of here earthquakes near Lemhi County
Elmore County, ID 110 km (68 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. 1.8 9 km NNW of Stanley, Idaho
  2. 2.3 27 km WNW of Stanley, Idaho
  3. 1.9 21 km WNW of Stanley, Idaho
  4. 2.1 32 km NW of Stanley, Idaho
  5. 2.3 34 km NW of Stanley, Idaho
  6. 2.2 20 km WNW of Stanley, Idaho
  7. 2.1 19 km WNW of Stanley, Idaho
  8. 2.2 22 km WNW of Stanley, Idaho
  9. 1.6 25 km NW of Stanley, Idaho
  10. 1.7 14 km NW of Stanley, Idaho
  11. 1.9 19 km WNW of Stanley, Idaho
  12. 1.6 16 km WNW of Stanley, Idaho
  13. 2.2 27 km NW of Stanley, Idaho
  14. 2.0 southern Idaho
  15. 1.9 34 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 130,000 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.