QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

38 km SW of Dillon, Montana

· 2.2 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 18 kmLemhi County 69 kmMadison County 94 kmClark County 95 kmSilver Bow County 103 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
2.2 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 18 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 695 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 45.0042, -113.0198. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 18 km (11 mi) SW of here earthquakes near Beaverhead County
Lemhi County, ID 69 km (43 mi) E of here earthquakes near Lemhi County
Madison County, MT 94 km (58 mi) WSW of here earthquakes near Madison County
Clark County, ID 95 km (59 mi) NNW of here earthquakes near Clark County
Silver Bow County, MT 103 km (64 mi) SSW of here earthquakes near Silver Bow County
Custer County, ID 127 km (79 mi) NE of here earthquakes near Custer County

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

Aftershocks so far

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

  1. 3.2 18 km N of Leadore, Idaho
  2. 2.0 13 km N of Dillon, Montana
  3. 1.6 11 km NNE of Dillon, Montana
  4. 2.5 9 km NNE of Dillon, Montana
  5. 2.5 10 km NNE of Dillon, Montana
  6. 1.8 27 km SW of Dillon, Montana
  7. 1.6 19 km NW of Lima, Montana
  8. 1.6 16 km SSW of Dillon, Montana
  9. 1.7 33 km NW of Lima, Montana
  10. 1.8 34 km NW of Lima, Montana
  11. 1.8 33 km NW of Lima, Montana
  12. 1.5 12 km N of Dillon, Montana
  13. 1.9 37 km SW of Dillon, Montana
  14. 2.4 13 km N of Dillon, Montana
  15. 1.7 25 km E of Leadore, Idaho

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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2024-10-07 — it released about 4,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.