QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

1 km N of Belgrade, Montana

· 13 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 31 kmPark County 62 kmBroadwater County 65 kmMadison County 78 kmJefferson County 78 kmMeagher County 90 kmSweet Grass County 95 kmSilver Bow County 116 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 3.0 (ml)
Depth
13 km below the surface
Felt
20 reports · strongest reported intensity III
Nearest
Gallatin County, 31 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 782 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 20 people have reported feeling it to USGS.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 45.7936, -111.1761. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 31 km (19 mi) N of here earthquakes near Gallatin County
Park County, MT 62 km (38 mi) NW of here earthquakes near Park County
Broadwater County, MT 65 km (40 mi) SSE of here earthquakes near Broadwater County
Madison County, MT 78 km (48 mi) NE of here earthquakes near Madison County
Jefferson County, MT 78 km (48 mi) ESE of here earthquakes near Jefferson County
Meagher County, MT 90 km (56 mi) SSW of here earthquakes near Meagher County

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

Aftershocks so far

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

  1. 1.9 14 km ESE of Harrison, Montana
  2. 2.1 4 km NW of Ponderosa Pines, Montana
  3. 1.7 17 km ESE of Harrison, Montana
  4. 1.6 6 km NW of Logan, Montana
  5. 1.5 4 km NE of Three Forks, Montana
  6. 2.0 14 km ESE of Harrison, Montana
  7. 1.7 4 km SW of Churchill, Montana
  8. 1.8 15 km ESE of Harrison, Montana
  9. 2.4 16 km ESE of Harrison, Montana
  10. 2.5 16 km ESE of Harrison, Montana
  11. 2.4 17 km ESE of Harrison, Montana
  12. 1.6 6 km NE of Three Forks, Montana
  13. 1.6 2 km E of Churchill, Montana
  14. 2.1 6 km NE of Logan, Montana
  15. 1.7 13 km S of Bozeman, 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 4.2 on 2019-08-16 — it released about 63 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.