QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

10 km NNE of Dillon, Montana

· 10 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 31 kmMadison County 52 kmSilver Bow County 66 kmDeer Lodge County 98 kmJefferson County 100 kmLemhi County 111 kmGallatin County 113 kmClark County 114 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 2.5 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 31 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 159 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 45.3024, -112.5812. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 31 km (19 mi) NE of here earthquakes near Beaverhead County
Madison County, MT 52 km (32 mi) W of here earthquakes near Madison County
Silver Bow County, MT 66 km (41 mi) S of here earthquakes near Silver Bow County
Deer Lodge County, MT 98 km (61 mi) SSE of here earthquakes near Deer Lodge County
Jefferson County, MT 100 km (62 mi) SSW of here earthquakes near Jefferson County
Lemhi County, ID 111 km (69 mi) ENE of here earthquakes near Lemhi County

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

Aftershocks so far

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

  1. 2.1 26 km SE of Dillon, Montana
  2. 2.3 14 km NNE of Twin Bridges, Montana
  3. 2.9 14 km NNE of Twin Bridges, Montana
  4. 1.8 14 km NNE of Twin Bridges, Montana
  5. 2.0 13 km N of Dillon, Montana
  6. 1.6 11 km NNE of Dillon, Montana
  7. 2.5 9 km NNE of Dillon, Montana
  8. 1.5 14 km NNE of Dillon, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2024-10-07 — it released about 250 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.