QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

23 km ESE of Dillon, Montana

· 7.2 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 39 kmBeaverhead County 43 kmSilver Bow County 86 kmClark County 96 kmGallatin County 101 kmJefferson 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 2.7 (ml)
Depth
7.2 km below the surface
Felt
no reports yet
Nearest
Madison County, 39 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1972 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 45.1530, -112.3505. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 39 km (24 mi) WSW of here earthquakes near Madison County
Beaverhead County, MT 43 km (26 mi) E of here earthquakes near Beaverhead County
Silver Bow County, MT 86 km (53 mi) SSE of here earthquakes near Silver Bow County
Clark County, ID 96 km (60 mi) N of here earthquakes near Clark County
Gallatin County, MT 101 km (63 mi) WSW of here earthquakes near Gallatin County
Jefferson County, MT 110 km (69 mi) SSW of here earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 1.8 3 km NNW of Alder, Montana
  2. 1.9 23 km SSE of Dillon, Montana
  3. 1.9 17 km N of Dillon, Montana
  4. 2.3 34 km S of Virginia City, Montana
  5. 1.9 8 km ESE of Sheridan, Montana
  6. 1.8 14 km N of Dillon, Montana
  7. 1.6 41 km S of Virginia City, Montana
  8. 2.1 32 km S of Virginia City, Montana
  9. 2.3 13 km NNE of Dillon, Montana
  10. 1.6 26 km NW of Lima, Montana
  11. 2.1 47 km ENE of Lima, Montana
  12. 2.0 33 km NNW of Lima, Montana
  13. 1.5 3 km ESE of Twin Bridges, Montana
  14. 2.7 26 km SSE of Virginia City, Montana
  15. 2.1 17 km NNE of Dillon, 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.