QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

36 km SSW of Stockett, Montana

· 16 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cascade County 32 kmMeagher County 56 kmJudith Basin County 73 kmBroadwater County 80 kmLewis and Clark County 85 kmChouteau County 114 kmTeton County 116 kmJefferson 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
16 km below the surface
Felt
no reports yet
Nearest
Cascade County, 32 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1742 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 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 47.0317, -111.2627. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cascade County, MT 32 km (20 mi) SSE of here earthquakes near Cascade County
Meagher County, MT 56 km (35 mi) NNW of here earthquakes near Meagher County
Judith Basin County, MT 73 km (45 mi) W of here earthquakes near Judith Basin County
Broadwater County, MT 80 km (50 mi) NNE of here earthquakes near Broadwater County
Lewis and Clark County, MT 85 km (53 mi) E of here earthquakes near Lewis and Clark County
Chouteau County, MT 114 km (71 mi) SSW of here earthquakes near Chouteau County

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

Aftershocks so far

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

  1. 2.0 32 km ENE of Helena Valley Northeast, Montana
  2. 1.5 31 km ENE of Helena Valley Northeast, Montana
  3. 2.5 23 km SSE of Craig, Montana
  4. 2.9 28 km ENE of Helena Valley Northeast, Montana
  5. 2.7 28 km ENE of Helena Valley Northeast, Montana
  6. 2.1 29 km ENE of Helena Valley Northeast, Montana
  7. 2.2 30 km ENE of Helena Valley Northeast, Montana
  8. 2.3 30 km ENE of Helena Valley Northeast, Montana
  9. 1.8 31 km ENE of Helena Valley Northeast, Montana
  10. 1.9 30 km ENE of Helena Valley Northeast, 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.