QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

8 km WNW of Four Corners, Montana

· 6.1 km deep · released about 18 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 17 kmMadison County 61 kmPark County 62 kmBroadwater County 78 kmJefferson County 80 kmSweet Grass County 106 kmMeagher County 108 kmSilver Bow County 110 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
6.1 km below the surface
Felt
no reports yet
Nearest
Gallatin County, 17 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2239 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 18 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 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 45.6472, -111.2860. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 17 km (11 mi) NNW of here earthquakes near Gallatin County
Madison County, MT 61 km (38 mi) NE of here earthquakes near Madison County
Park County, MT 62 km (38 mi) WNW of here earthquakes near Park County
Broadwater County, MT 78 km (48 mi) SSE of here earthquakes near Broadwater County
Jefferson County, MT 80 km (50 mi) SE of here earthquakes near Jefferson County
Sweet Grass County, MT 106 km (66 mi) W of here earthquakes near Sweet Grass 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. 1.5 5 km SW of Manhattan, Montana
  2. 2.1 2 km WSW of Logan, Montana
  3. 1.8 5 km NW of Logan, Montana
  4. 1.7 1 km ENE of Churchill, Montana
  5. 2.0 4 km W of Three Forks, Montana
  6. 1.9 7 km NNE of Manhattan, Montana
  7. 1.5 8 km S of Harrison, Montana
  8. 3.1 6 km NNW of Three Forks, Montana
  9. 2.3 Western Montana
  10. 2.3 3 km NW of Three Forks, Montana
  11. 2.1 3 km NNW of Three Forks, Montana
  12. 2.0 3 km NNW of Three Forks, Montana
  13. 1.6 3 km S of Logan, Montana
  14. 1.6 6 km NW of Ponderosa Pines, Montana
  15. 2.4 4 km NNW of Logan, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.2 on 2019-08-16 — it released about 3,300 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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