QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

23 km SW of Ovando, Montana

· 7.7 km deep · released about 8.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 31 kmMissoula County 46 kmGranite County 52 kmLewis and Clark County 78 kmDeer Lodge County 86 kmLake County 103 kmRavalli County 105 kmSilver Bow 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 1.6 (ml)
Depth
7.7 km below the surface
Felt
no reports yet
Nearest
Powell County, 31 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2815 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 46.8600, -113.3433. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 31 km (20 mi) W of here earthquakes near Powell County
Missoula County, MT 46 km (28 mi) ESE of here earthquakes near Missoula County
Granite County, MT 52 km (32 mi) N of here earthquakes near Granite County
Lewis and Clark County, MT 78 km (49 mi) WSW of here earthquakes near Lewis and Clark County
Deer Lodge County, MT 86 km (54 mi) N of here earthquakes near Deer Lodge County
Lake County, MT 103 km (64 mi) SSE of here earthquakes near Lake County

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

Aftershocks so far

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

  1. 1.5 20 km ENE of Seeley Lake, Montana
  2. 2.5 25 km ENE of Seeley Lake, Montana
  3. 1.8 2 km S of Turah, Montana
  4. 1.6 10 km WSW of Drummond, Montana
  5. 2.4 21 km ENE of Seeley Lake, Montana
  6. 1.6 21 km NE of Drummond, Montana
  7. 1.7 15 km WSW of Drummond, Montana
  8. 2.3 13 km ESE of Ovando, Montana
  9. 1.5 21 km NNW of Drummond, Montana
  10. 2.1 16 km ESE of Ovando, Montana
  11. 2.8 17 km ESE of Ovando, Montana
  12. 1.6 6 km NW of Drummond, Montana
  13. 1.8 12 km SE of Seeley Lake, Montana
  14. 1.5 4 km S of Drummond, Montana
  15. 2.0 25 km NE of Ovando, 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.