QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

21 km SSW of Red Lodge, Montana

· 0.5 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Carbon County 36 kmPark County 61 kmStillwater County 72 kmSweet Grass County 99 kmPark County 103 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
0.5 km below the surface
Felt
no reports yet
Nearest
Carbon County, 36 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2461 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 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 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× 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 45.0153, -109.3792. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Carbon County, MT 36 km (22 mi) SW of here earthquakes near Carbon County
Park County, WY 61 km (38 mi) NNE of here earthquakes near Park County
Stillwater County, MT 72 km (44 mi) S of here earthquakes near Stillwater County
Sweet Grass County, MT 99 km (61 mi) SSE of here earthquakes near Sweet Grass County
Park County, MT 103 km (64 mi) ESE of here earthquakes near Park County
Big Horn County, WY 122 km (76 mi) WNW of here earthquakes near Big Horn County

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

Aftershocks so far

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

  1. 1.7 10 km NNE of Cooke City, Montana
  2. 1.5 39 km WNW of Cody, Wyoming
  3. 1.6 26 km SSE of Cooke City, 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.