QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

4 km ESE of Carter, Montana

· 6.1 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chouteau County 38 kmCascade County 59 kmLiberty County 90 kmJudith Basin County 93 kmTeton County 103 kmPondera County 111 kmHill County 114 kmToole 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 1.6 (ml)
Depth
6.1 km below the surface
Felt
no reports yet
Nearest
Chouteau County, 38 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 870 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 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 47.7592, -110.9055. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chouteau County, MT 38 km (23 mi) WSW of here earthquakes near Chouteau County
Cascade County, MT 59 km (37 mi) NE of here earthquakes near Cascade County
Liberty County, MT 90 km (56 mi) S of here earthquakes near Liberty County
Judith Basin County, MT 93 km (58 mi) NNW of here earthquakes near Judith Basin County
Teton County, MT 103 km (64 mi) E of here earthquakes near Teton County
Pondera County, MT 111 km (69 mi) ESE of here earthquakes near Pondera County

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

Aftershocks so far

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

  1. 3.7 7 km NNW of Black Eagle, Montana
  2. 2.4 9 km NNE of Black Eagle, Montana
  3. 1.9 9 km N of Black Eagle, Montana
  4. 2.6 10 km NNE of Black Eagle, Montana
  5. 3.7 3 km SE of Black Eagle, Montana
  6. 3.2 3 km NW of Malmstrom Air Force Base, Montana
  7. 2.7 5 km NNW of Malmstrom Air Force Base, Montana
  8. 4.2 9 km N of Black Eagle, 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.