QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

7 km WSW of Ennis, Montana

· 12 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 8 kmGallatin County 55 kmBeaverhead County 87 kmJefferson County 92 kmSilver Bow County 93 kmPark County 101 kmBroadwater 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 1.5 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Madison County, 8 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1944 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 45.3132, -111.8113. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 8 km (5 mi) E of here earthquakes near Madison County
Gallatin County, MT 55 km (34 mi) WSW of here earthquakes near Gallatin County
Beaverhead County, MT 87 km (54 mi) ENE of here earthquakes near Beaverhead County
Jefferson County, MT 92 km (57 mi) SSE of here earthquakes near Jefferson County
Silver Bow County, MT 93 km (57 mi) SE of here earthquakes near Silver Bow County
Park County, MT 101 km (63 mi) W of here earthquakes near Park County

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

Aftershocks so far

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

  1. 1.8 18 km N of Ennis, Montana
  2. 2.5 3 km WNW of Pony, Montana
  3. 1.9 37 km SW of Big Sky, Montana
  4. 1.7 16 km N of Big Sky, Montana
  5. 1.6 28 km SE of Virginia City, Montana
  6. 1.6 14 km ESE of Harrison, Montana
  7. 1.7 28 km S of Ennis, Montana
  8. 2.1 17 km NNE of Ennis, Montana
  9. 1.6 18 km WNW of Pony, Montana
  10. 1.8 20 km WSW of Gallatin Gateway, Montana
  11. 1.8 3 km NNW of Alder, Montana
  12. 1.6 13 km S of Ennis, Montana
  13. 3.0 18 km NNE of Ennis, Montana
  14. 2.5 13 km NNW of Ennis, Montana
  15. 1.9 12 km NNW of Ennis, 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.