QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0ml

11 km S of Ennis, Montana

· 5.0 km deep · released about 29 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 18 kmGallatin County 52 kmBeaverhead County 93 kmPark County 95 kmJefferson County 101 kmSilver Bow County 103 kmFremont County 116 kmClark 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 2.0 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Madison County, 18 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 460 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 29 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 520,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 370,000× the energy of this one
  3. Around the size people start to feel M 3.0 33× the energy of this one
  4. This earthquake M 2.0 about 29 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 45.2485, -111.7152. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 18 km (11 mi) ESE of here earthquakes near Madison County
Gallatin County, MT 52 km (33 mi) SW of here earthquakes near Gallatin County
Beaverhead County, MT 93 km (58 mi) E of here earthquakes near Beaverhead County
Park County, MT 95 km (59 mi) WSW of here earthquakes near Park County
Jefferson County, MT 101 km (63 mi) SSE of here earthquakes near Jefferson County
Silver Bow County, MT 103 km (64 mi) SE of here earthquakes near Silver Bow County

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

Aftershocks so far

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

  1. 0.4 29 km WNW of Hebgen Lake Estates, Montana
  2. 0.1 31 km WNW of Hebgen Lake Estates, Montana
  3. 0.3 24 km WNW of Hebgen Lake Estates, Montana
  4. 0.0 25 km WNW of Hebgen Lake Estates, Montana
  5. 1.9 14 km ESE of Harrison, Montana
  6. 2.1 12 km NW of Ennis, Montana
  7. 1.5 13 km NNW of Ennis, Montana
  8. 1.7 17 km ESE of Harrison, Montana
  9. 1.9 25 km S of Ennis, Montana
  10. 1.6 34 km SSE of Virginia City, Montana
  11. 1.8 30 km WNW of Hebgen Lake Estates, Montana
  12. 2.0 14 km ESE of Harrison, Montana
  13. 1.9 9 km SSE of Harrison, Montana
  14. 1.8 15 km ESE of Harrison, Montana
  15. 2.4 16 km ESE of Harrison, 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

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