QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

42 km NNW of Stanley, Idaho

· 8.1 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Valley County 47 kmBoise County 72 kmCuster County 83 kmAdams County 104 kmGem County 107 kmLemhi County 115 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 1.9 (ml)
Depth
8.1 km below the surface
Felt
no reports yet
Nearest
Valley County, 47 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2091 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 20 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 44.5337, -115.2318. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Valley County, ID 47 km (29 mi) SE of here earthquakes near Valley County
Boise County, ID 72 km (45 mi) NNE of here earthquakes near Boise County
Custer County, ID 83 km (52 mi) WNW of here earthquakes near Custer County
Adams County, ID 104 km (65 mi) ESE of here earthquakes near Adams County
Gem County, ID 107 km (66 mi) ENE of here earthquakes near Gem County
Lemhi County, ID 115 km (71 mi) WSW of here earthquakes near Lemhi 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. 2.3 7 km NNW of Stanley, Idaho
  2. 1.8 8 km N of Stanley, Idaho
  3. 1.7 9 km N of Stanley, Idaho
  4. 2.4 14 km NW of Stanley, Idaho
  5. 1.8 10 km NNW of Stanley, Idaho
  6. 1.8 41 km NNW of Stanley, Idaho
  7. 2.7 39 km NW of Stanley, Idaho
  8. 1.8 42 km NNW of Stanley, Idaho
  9. 1.8 southern Idaho
  10. 2.0 26 km NW of Stanley, Idaho
  11. 2.5 42 km NW of Stanley, Idaho
  12. 1.7 18 km WNW of Stanley, Idaho
  13. 2.3 28 km NW of Stanley, Idaho
  14. 2.4 22 km WNW of Stanley, Idaho
  15. 1.6 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 8,500,000 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.