QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

23 km SE of White Sulphur Springs, Montana

· 9.7 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Meagher County 28 kmBroadwater County 60 kmWheatland County 67 kmJudith Basin County 79 kmSweet Grass County 87 kmGallatin County 102 kmPark County 103 kmJefferson County 107 kmCascade 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
9.7 km below the surface
Felt
no reports yet
Nearest
Meagher County, 28 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3100 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 21 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 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 46.3780, -110.7168. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Meagher County, MT 28 km (17 mi) SE of here earthquakes near Meagher County
Broadwater County, MT 60 km (37 mi) E of here earthquakes near Broadwater County
Wheatland County, MT 67 km (42 mi) W of here earthquakes near Wheatland County
Judith Basin County, MT 79 km (49 mi) SSW of here earthquakes near Judith Basin County
Sweet Grass County, MT 87 km (54 mi) NW of here earthquakes near Sweet Grass County
Gallatin County, MT 102 km (63 mi) NNE of here earthquakes near Gallatin County

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

Aftershocks so far

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

  1. 1.8 23 km ENE of Wilsall, Montana
  2. 2.2 30 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.