QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mwr

11 km NNE of Manhattan, Montana

· 6.3 km deep · released about 15 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Broadwater County 46 kmGallatin County 49 kmJefferson County 64 kmMeagher County 76 kmPark County 79 kmMadison County 86 kmSweet Grass County 104 kmSilver Bow County 108 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 4.0 (mwr)
Depth
6.3 km below the surface
Felt
650 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Broadwater County, 46 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1859 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 650 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 45.9495, -111.2715. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Broadwater County, MT 46 km (28 mi) SSE of here earthquakes near Broadwater County
Gallatin County, MT 49 km (30 mi) N of here earthquakes near Gallatin County
Jefferson County, MT 64 km (40 mi) ESE of here earthquakes near Jefferson County
Meagher County, MT 76 km (47 mi) SSW of here earthquakes near Meagher County
Park County, MT 79 km (49 mi) NW of here earthquakes near Park County
Madison County, MT 86 km (53 mi) NE of here earthquakes near Madison 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. 1.9 2 km SE of Logan, Montana
  2. 1.7 3 km W of Manhattan, Montana
  3. 1.6 3 km N of Logan, Montana
  4. 1.5 5 km W of Townsend, Montana
  5. 1.6 3 km WNW of Manhattan, Montana
  6. 1.8 3 km WNW of Manhattan, Montana
  7. 1.5 3 km ESE of Logan, Montana
  8. 1.6 3 km WNW of Manhattan, Montana
  9. 1.7 3 km ESE of Logan, Montana
  10. 2.0 3 km ESE of Logan, Montana
  11. 4.2 4 km NW of Manhattan, Montana
  12. 3.4 3 km W of Manhattan, Montana
  13. 2.4 3 km WNW of Manhattan, Montana
  14. 2.3 3 km WSW of Manhattan, Montana
  15. 1.8 3 km W of Manhattan, 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.