QuakeIndex

quarry blast · reviewed by a seismologist

M 1.7ml

17 km ESE of Dillon, Montana

· -2.0 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 37 kmMadison County 43 kmSilver Bow County 82 kmClark County 99 kmGallatin County 105 kmJefferson County 109 kmDeer Lodge County 116 kmLemhi County 118 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 1.7 (ml)
Depth
-2.0 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 37 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1992 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 45.1812, -112.4218. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 37 km (23 mi) E of here earthquakes near Beaverhead County
Madison County, MT 43 km (27 mi) WSW of here earthquakes near Madison County
Silver Bow County, MT 82 km (51 mi) SSE of here earthquakes near Silver Bow County
Clark County, ID 99 km (62 mi) N of here earthquakes near Clark County
Gallatin County, MT 105 km (65 mi) WSW of here earthquakes near Gallatin County
Jefferson County, MT 109 km (67 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

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

  1. 1.5 35 km S of Virginia City, Montana
  2. 1.7 33 km S of Virginia City, Montana
  3. 1.6 42 km S of Alder, Montana
  4. 2.2 32 km S of Virginia City, Montana
  5. 1.5 Idaho-Montana border region
  6. 2.5 11 km NNE of Dillon, Montana
  7. 1.8 Idaho-Montana border region
  8. 1.5 14 km NNE of Dillon, Montana
  9. 1.6 18 km ESE of Dillon, Montana
  10. 1.7 28 km WNW of Dillon, Montana
  11. 1.7 12 km NNE of Lima, Montana
  12. 2.3 12 km N of Dillon, Montana
  13. 2.0 Western Montana
  14. 2.6 17 km SW of Dillon, Montana
  15. 1.8 3 km NNW of Alder, 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.