QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

9 km WSW of South Glastonbury, Montana

· 19 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 33 kmPark County 36 kmMadison County 78 kmSweet Grass County 96 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 1.6 (ml)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Gallatin County, 33 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 915 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 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 45.2773, -110.9153. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 33 km (21 mi) SE of here earthquakes near Gallatin County
Park County, MT 36 km (22 mi) SW of here earthquakes near Park County
Madison County, MT 78 km (49 mi) E of here earthquakes near Madison County
Sweet Grass County, MT 96 km (60 mi) SW of here earthquakes near Sweet Grass County
Broadwater County, MT 125 km (78 mi) SSE of here earthquakes near Broadwater County
Fremont County, ID 126 km (78 mi) NNE of here earthquakes near Fremont County

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

Aftershocks so far

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

  1. 1.2 21 km ESE of Pray, Montana
  2. 1.7 13 km S of Bozeman, Montana
  3. 1.5 14 km NNW of Emigrant, Montana
  4. 1.9 26 km NNW of Hebgen Lake Estates, Montana
  5. 2.0 14 km SSW of Mammoth, Wyoming
  6. 1.6 7 km NNW of Emigrant, Montana
  7. 1.5 23 km WNW of Corwin Springs, Montana
  8. 2.3 23 km WNW of Corwin Springs, Montana
  9. 1.9 23 km WNW of Corwin Springs, Montana
  10. 2.0 23 km WNW of Corwin Springs, 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.