QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

7 km NW of Willow Creek, Montana

· 11 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Jefferson County 39 kmBroadwater County 54 kmGallatin County 58 kmMadison County 62 kmSilver Bow County 73 kmMeagher County 101 kmPark County 103 kmDeer Lodge County 113 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 2.4 (ml)
Depth
11 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Jefferson County, 39 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 586 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 45.8658, -111.7216. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Jefferson County, MT 39 km (24 mi) SE of here earthquakes near Jefferson County
Broadwater County, MT 54 km (34 mi) SSW of here earthquakes near Broadwater County
Gallatin County, MT 58 km (36 mi) NW of here earthquakes near Gallatin County
Madison County, MT 62 km (38 mi) NNE of here earthquakes near Madison County
Silver Bow County, MT 73 km (45 mi) E of here earthquakes near Silver Bow County
Meagher County, MT 101 km (63 mi) SW of here earthquakes near Meagher County

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

Aftershocks so far

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

  1. 1.9 14 km ESE of Harrison, Montana
  2. 2.1 12 km NW of Ennis, Montana
  3. 1.5 13 km NNW of Ennis, Montana
  4. 2.1 4 km NW of Ponderosa Pines, Montana
  5. 1.7 17 km ESE of Harrison, Montana
  6. 2.0 2 km NNW of Pony, Montana
  7. 1.6 9 km W of Townsend, Montana
  8. 1.6 6 km NW of Logan, Montana
  9. 1.5 9 km WSW of Townsend, Montana
  10. 1.5 4 km NE of Three Forks, Montana
  11. 2.0 14 km ESE of Harrison, Montana
  12. 1.7 4 km SW of Churchill, Montana
  13. 2.3 14 km NNE of Twin Bridges, Montana
  14. 2.9 14 km NNE of Twin Bridges, Montana
  15. 1.8 14 km NNE of Twin Bridges, 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 500 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.