QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

5 km SSE of Logan, Montana

· 13 km deep · released about 85 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 40 kmBroadwater County 55 kmJefferson County 60 kmMadison County 70 kmPark County 79 kmMeagher County 90 kmSilver Bow County 98 kmSweet Grass 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 2.3 (ml)
Depth
13 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Gallatin County, 40 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2780 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 45.8438, -111.3962. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 40 km (25 mi) NNW of here earthquakes near Gallatin County
Broadwater County, MT 55 km (34 mi) S of here earthquakes near Broadwater County
Jefferson County, MT 60 km (37 mi) ESE of here earthquakes near Jefferson County
Madison County, MT 70 km (44 mi) NE of here earthquakes near Madison County
Park County, MT 79 km (49 mi) WNW of here earthquakes near Park 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

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

  1. 3.0 3 km WNW of Manhattan, Montana
  2. 1.7 2 km WNW of Manhattan, Montana
  3. 1.6 2 km WNW of Manhattan, Montana
  4. 1.7 3 km WNW of Manhattan, Montana
  5. 2.1 13 km WSW of Radersburg, Montana
  6. 2.2 2 km NW of Manhattan, Montana
  7. 2.5 1 km W of Manhattan, Montana
  8. 1.7 1 km W of Manhattan, Montana
  9. 1.6 2 km W of Manhattan, Montana
  10. 1.9 1 km SW of Manhattan, Montana
  11. 1.5 3 km WNW of Manhattan, Montana
  12. 2.2 2 km W of Manhattan, Montana
  13. 2.4 2 km WNW of Manhattan, Montana
  14. 1.7 3 km E of Logan, Montana
  15. 1.8 1 km W of Manhattan, 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.

On USGS

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