QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3ml

19 km E of Lincoln, Montana

· 1.6 km deep · released about 47 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis and Clark County 20 kmPowell County 40 kmCascade County 91 kmJefferson County 95 kmTeton County 98 kmGranite County 98 kmBroadwater County 98 kmDeer Lodge County 110 kmMissoula 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 4.3 (ml)
Depth
1.6 km below the surface
Felt
5 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
Lewis and Clark County, 20 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1512 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 47 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 3,600× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 160× the energy of this one
  3. Magna, Utah 2020 M 5.7 110× the energy of this one
  4. This earthquake M 4.3 about 47 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 99× 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 46.9460, -112.4205. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis and Clark County, MT 20 km (12 mi) S of here earthquakes near Lewis and Clark County
Powell County, MT 40 km (25 mi) ENE of here earthquakes near Powell County
Cascade County, MT 91 km (56 mi) WSW of here earthquakes near Cascade County
Jefferson County, MT 95 km (59 mi) NNW of here earthquakes near Jefferson County
Teton County, MT 98 km (61 mi) S of here earthquakes near Teton County
Granite County, MT 98 km (61 mi) NE of here earthquakes near Granite County

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

Aftershocks so far

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

  1. 1.5 3 km NW of Helena Valley Northwest, Montana
  2. 1.7 5 km ESE of Craig, Montana
  3. 1.6 7 km WSW of Elliston, Montana
  4. 2.7 8 km WSW of Elliston, MT
  5. 1.7 24 km SSW of Augusta, Montana
  6. 1.7 12 km ESE of Lincoln, Montana
  7. 1.8 7 km WSW of Elliston, Montana
  8. 1.8 12 km N of Helena Valley Northeast, Montana
  9. 1.7 13 km SE of Lincoln, Montana
  10. 1.6 7 km NNE of Helena Valley Northwest, Montana
  11. 2.3 7 km NNE of Helena Valley Northwest, Montana
  12. 1.6 12 km WNW of Lincoln, Montana
  13. 1.5 10 km W of Helena West Side, Montana
  14. 2.3 7 km NE of Marysville, Montana
  15. 2.1 12 km ESE of Lincoln, Montana

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.