QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

23 km SSE of Dillon, Montana

· 5.0 km deep · released about 24 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Beaverhead County 31 kmMadison County 59 kmClark County 82 kmSilver Bow County 99 kmLemhi County 107 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 1.9 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Beaverhead County, 31 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1196 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 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 45.0148, -112.5292. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Beaverhead County, MT 31 km (20 mi) ESE of here earthquakes near Beaverhead County
Madison County, MT 59 km (37 mi) SW of here earthquakes near Madison County
Clark County, ID 82 km (51 mi) N of here earthquakes near Clark County
Silver Bow County, MT 99 km (61 mi) S of here earthquakes near Silver Bow County
Lemhi County, ID 107 km (67 mi) E of here earthquakes near Lemhi County
Gallatin County, MT 121 km (75 mi) WSW of here earthquakes near Gallatin County

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

Aftershocks so far

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

  1. 1.5 3 km SE of Lima, Montana
  2. 2.5 11 km NNE of Dillon, Montana
  3. 2.6 6 km E of Lima, Montana
  4. 2.4 Idaho-Montana border region
  5. 1.8 Idaho-Montana border region
  6. 2.6 8 km ESE of Lima, Montana
  7. 1.5 14 km NNE of Dillon, Montana
  8. 2.4 1 km WSW of Lima, Montana
  9. 1.6 18 km ESE of Dillon, Montana
  10. 2.2 8 km E of Lima, Montana
  11. 1.7 28 km WNW of Dillon, Montana
  12. 1.6 3 km SSE of Lima, Montana
  13. 1.7 3 km SSE of Lima, Montana
  14. 2.1 3 km SSE of Lima, Montana
  15. 2.3 3 km SSE of Lima, 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 4.6 on 2019-04-09 — it released about 10,000 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.