QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

18 km NW of Marion, Montana

· 8.8 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sanders County 55 kmLincoln County 59 kmFlathead County 61 kmLake County 86 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
8.8 km below the surface
Felt
no reports yet
Nearest
Sanders County, 55 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1721 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 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 48.2050, -114.8675. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sanders County, MT 55 km (34 mi) NNE of here earthquakes near Sanders County
Lincoln County, MT 59 km (36 mi) SE of here earthquakes near Lincoln County
Flathead County, MT 61 km (38 mi) W of here earthquakes near Flathead County
Lake County, MT 86 km (53 mi) NW of here earthquakes near Lake County
Mineral County, MT 121 km (75 mi) N of here earthquakes near Mineral County
Shoshone County, ID 122 km (76 mi) NE of here earthquakes near Shoshone County

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

Aftershocks so far

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

  1. 1.7 19 km SW of Marion, Montana
  2. 2.3 18 km SW of Marion, Montana
  3. 2.0 19 km SW of Marion, Montana
  4. 2.2 7 km WNW of Lake Mary Ronan, Montana
  5. 1.7 7 km WNW of Lake Mary Ronan, Montana
  6. 1.8 6 km WNW of Lake Mary Ronan, Montana
  7. 1.7 21 km SSE of Happys Inn, Montana
  8. 2.0 17 km W of Niarada, Montana
  9. 2.3 6 km NNE of Olney, Montana
  10. 1.8 3 km NW of Happys Inn, Montana
  11. 1.6 4 km NW of Niarada, Montana
  12. 2.6 4 km NW of Happys Inn, Montana
  13. 1.8 17 km WNW of Niarada, Montana
  14. 1.7 11 km NW of Batavia, Montana
  15. 2.2 16 km ENE of Happys Inn, 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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