QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

13 km E of Martin City, Montana

· 9.9 km deep · released about 8.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Flathead County 19 kmGlacier County 72 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 1.6 (ml)
Depth
9.9 km below the surface
Felt
no reports yet
Nearest
Flathead County, 19 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1791 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 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 48.4000, -113.8510. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Flathead County, MT 19 km (12 mi) NE of here earthquakes near Flathead County
Glacier County, MT 72 km (45 mi) WSW of here earthquakes near Glacier County
Lake County, MT 86 km (53 mi) NNE of here earthquakes near Lake County
Lincoln County, MT 120 km (75 mi) E of here earthquakes near Lincoln County
Sanders County, MT 122 km (76 mi) NE of here earthquakes near Sanders County
Teton County, MT 133 km (83 mi) WNW of here earthquakes near Teton County

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

Aftershocks so far

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

  1. 2.0 5 km SSW of West Glacier, Montana
  2. 1.8 12 km NE of Forest Hill Village, Montana
  3. 1.9 12 km ESE of Evergreen, Montana
  4. 1.7 1 km S of Woods Bay, Montana
  5. 1.7 30 km ESE of Martin City, Montana
  6. 2.3 10 km NNW of Swan Lake, Montana
  7. 1.7 15 km NNE of Bigfork, Montana
  8. 1.7 5 km ESE of Lakeside, Montana
  9. 1.5 8 km ESE of Woods Bay, Montana
  10. 1.6 3 km NNE of Somers, Montana
  11. 2.0 1 km ENE of Columbia Falls, Montana
  12. 1.6 Western Montana
  13. 2.1 8 km NNW of Bigfork, Montana
  14. 2.1 16 km NNE of Swan Lake, Montana
  15. 1.7 3 km E of Forest Hill Village, 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.