QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mwr

21 km NNW of Stanley, Idaho

· 5.7 km deep · released about 2.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 65 kmValley County 68 kmBoise County 69 kmCamas County 101 kmLemhi County 110 kmGem County 113 kmElmore County 116 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 3.5 (mwr)
Depth
5.7 km below the surface
Felt
5 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
Nearest
Custer County, 65 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2059 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 63,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,000× the energy of this one
  4. This earthquake M 3.5 about 2.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.6× 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 44.3917, -115.0584. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, ID 65 km (41 mi) WNW of here earthquakes near Custer County
Valley County, ID 68 km (42 mi) SE of here earthquakes near Valley County
Boise County, ID 69 km (43 mi) NE of here earthquakes near Boise County
Camas County, ID 101 km (63 mi) NNW of here earthquakes near Camas County
Lemhi County, ID 110 km (68 mi) WSW of here earthquakes near Lemhi County
Gem County, ID 113 km (70 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. 1.9 16 km NNW of Stanley, Idaho
  2. 2.0 13 km NNW of Stanley, Idaho
  3. 2.5 23 km NW of Stanley, Idaho
  4. 2.0 24 km NW of Stanley, Idaho
  5. 1.8 24 km WNW of Stanley, Idaho
  6. 2.4 10 km WNW of Stanley, Idaho
  7. 1.7 20 km WNW of Stanley, Idaho
  8. 2.2 41 km NNW of Stanley, Idaho
  9. 2.1 22 km WNW of Stanley, Idaho
  10. 2.5 33 km NW of Stanley, Idaho
  11. 2.2 12 km WNW of Stanley, Idaho
  12. 2.1 12 km NW of Stanley, Idaho
  13. 2.4 12 km NW of Stanley, Idaho
  14. 2.6 33 km NW of Stanley, Idaho
  15. 2.5 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 32,000 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.