QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

8 km NE of Bigfork, Montana

· 8.8 km deep · released about 9.6 lb of TNT

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10 km30 km60 km120 km N Flathead County 21 kmLake County 53 kmSanders County 98 kmGlacier County 98 kmLincoln County 120 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
Flathead County, 21 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2422 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 9.6 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 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 48.1147, -113.9820. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Flathead County, MT 21 km (13 mi) SSE of here earthquakes near Flathead County
Lake County, MT 53 km (33 mi) N of here earthquakes near Lake County
Sanders County, MT 98 km (61 mi) ENE of here earthquakes near Sanders County
Glacier County, MT 98 km (61 mi) SW of here earthquakes near Glacier County
Lincoln County, MT 120 km (74 mi) ESE of here earthquakes near Lincoln County
Mineral County, MT 137 km (85 mi) NE of here earthquakes near Mineral 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. 2.1 20 km E of Finley Point, Montana
  2. 1.7 19 km E of Finley Point, Montana
  3. 1.9 12 km ESE of Evergreen, Montana
  4. 1.6 6 km SW of Woods Bay, Montana
  5. 1.7 1 km S of Woods Bay, Montana
  6. 2.1 6 km SW of Woods Bay, Montana
  7. 1.6 6 km SW of Woods Bay, Montana
  8. 2.2 7 km WNW of Lake Mary Ronan, Montana
  9. 1.7 7 km WNW of Lake Mary Ronan, Montana
  10. 1.8 6 km WNW of Lake Mary Ronan, Montana
  11. 1.7 30 km ESE of Martin City, Montana
  12. 2.1 27 km E of Swan Lake, Montana
  13. 2.5 24 km E of Swan Lake, Montana
  14. 2.4 27 km E of Swan Lake, Montana
  15. 2.3 10 km NNW of Swan Lake, 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.