QuakeIndex

Earthquake · reviewed by a seismologist

M 4.6mww

9 km NE of Lima, Montana

· 14 km deep · released about 120 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 47 kmBeaverhead County 57 kmMadison County 84 kmFremont County 97 kmJefferson County 101 kmLemhi County 112 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 (mww)
Depth
14 km below the surface
Felt
73 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Clark County, 47 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2045 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 73 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 44.6972, -112.5078. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 47 km (29 mi) NNW of here earthquakes near Clark County
Beaverhead County, MT 57 km (36 mi) SSE of here earthquakes near Beaverhead County
Madison County, MT 84 km (52 mi) SW of here earthquakes near Madison County
Fremont County, ID 97 km (60 mi) WNW of here earthquakes near Fremont County
Jefferson County, ID 101 km (63 mi) N of here earthquakes near Jefferson County
Lemhi County, ID 112 km (69 mi) ESE of here earthquakes near Lemhi County

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

Aftershocks so far

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

  1. 1.7 6 km E of Lima, Montana
  2. 2.0 28 km SW of Dillon, Montana
  3. 1.7 8 km E of Lima, Montana
  4. 1.6 7 km E of Lima, Montana
  5. 1.6 8 km E of Lima, Montana
  6. 1.9 7 km E of Lima, Montana
  7. 3.3 8 km ESE of Lima, Montana
  8. 2.3 6 km NNE of Lima, Montana
  9. 1.9 6 km E of Lima, Montana
  10. 1.8 20 km NW of Lima, Montana
  11. 1.6 27 km SW of Lima, Montana
  12. 1.6 36 km N of Spencer, Idaho
  13. 1.8 29 km ENE of Leadore, Idaho
  14. 1.5 24 km WSW of Lima, Montana
  15. 1.9 29 km NNE of Spencer, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.