QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

10 km ENE of Townsend, Montana

· 7.1 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Broadwater County 8 kmMeagher County 45 kmJefferson County 57 kmGallatin County 93 kmCascade County 109 kmSilver Bow County 109 kmJudith Basin County 113 kmLewis and Clark County 115 kmPark 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 2.2 (ml)
Depth
7.1 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Broadwater County, 8 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2667 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 46.3412, -111.3945. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Broadwater County, MT 8 km (5 mi) E of here earthquakes near Broadwater County
Meagher County, MT 45 km (28 mi) SW of here earthquakes near Meagher County
Jefferson County, MT 57 km (35 mi) ENE of here earthquakes near Jefferson County
Gallatin County, MT 93 km (58 mi) N of here earthquakes near Gallatin County
Cascade County, MT 109 km (67 mi) S of here earthquakes near Cascade County
Silver Bow County, MT 109 km (68 mi) ENE 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

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

  1. 1.5 11 km NE of Manhattan, Montana
  2. 1.7 6 km NNE of Logan, Montana
  3. 2.3 11 km ENE of Toston, Montana
  4. 2.0 7 km ENE of Toston, Montana
  5. 1.9 10 km SE of Ponderosa Pines, Montana
  6. 2.1 10 km SE of Ponderosa Pines, Montana
  7. 1.5 6 km W of Townsend, Montana
  8. 1.7 3 km SSW of Radersburg, Montana
  9. 1.7 9 km ENE of Townsend, Montana
  10. 1.6 7 km NNW of Logan, Montana
  11. 1.6 6 km WSW of Townsend, Montana
  12. 1.6 6 km W of Townsend, Montana
  13. 1.5 4 km SW of The Silos, Montana
  14. 1.9 14 km SW of Radersburg, Montana
  15. 1.6 6 km W of Townsend, 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.