QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

17 km NNW of Dupuyer, Montana

· 5.8 km deep · released about 24 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pondera County 31 kmGlacier County 51 kmTeton County 62 kmToole County 73 kmFlathead County 107 kmLiberty County 119 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 1.9 (ml)
Depth
5.8 km below the surface
Felt
no reports yet
Nearest
Pondera County, 31 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2486 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 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 48.3297, -112.6057. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pondera County, MT 31 km (19 mi) WNW of here earthquakes near Pondera County
Glacier County, MT 51 km (31 mi) SE of here earthquakes near Glacier County
Teton County, MT 62 km (38 mi) NNW of here earthquakes near Teton County
Toole County, MT 73 km (46 mi) WSW of here earthquakes near Toole County
Flathead County, MT 107 km (67 mi) E of here earthquakes near Flathead County
Liberty County, MT 119 km (74 mi) WSW of here earthquakes near Liberty 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. 1.6 9 km ESE of Cut Bank, Montana
  2. 2.0 19 km SW of Heart Butte, Montana
  3. 1.8 22 km SW of Heart Butte, 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.