QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

28 km ENE of Wilsall, Montana

· 6.0 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sweet Grass County 46 kmWheatland County 55 kmMeagher County 68 kmPark County 75 kmStillwater County 90 kmBroadwater County 92 kmGallatin County 93 kmGolden Valley County 94 kmJudith Basin County 101 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 1.7 (ml)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Sweet Grass County, 46 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3291 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 46.1253, -110.3388. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sweet Grass County, MT 46 km (29 mi) NW of here earthquakes near Sweet Grass County
Wheatland County, MT 55 km (34 mi) SW of here earthquakes near Wheatland County
Meagher County, MT 68 km (42 mi) SE of here earthquakes near Meagher County
Park County, MT 75 km (47 mi) NNE of here earthquakes near Park County
Stillwater County, MT 90 km (56 mi) NW of here earthquakes near Stillwater County
Broadwater County, MT 92 km (57 mi) ESE of here earthquakes near Broadwater 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. 1.8 23 km ENE of Wilsall, Montana
  2. 3.8 9 km NNW of Livingston, Montana
  3. 2.2 30 km ENE of Wilsall, Montana
  4. 1.9 23 km SE of White Sulphur Springs, Montana
  5. 2.7 32 km NE of Wilsall, Montana
  6. 2.4 32 km ENE of Wilsall, Montana
  7. 1.7 32 km ENE of Wilsall, Montana
  8. 2.1 29 km ENE of Wilsall, 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.