QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

10 km WSW of Hebgen Lake Estates, Montana

· 6.1 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 58 kmMadison County 83 kmGallatin County 89 kmClark County 96 kmTeton County 102 kmPark County 102 kmTeton County 107 kmMadison 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 2.1 (ml)
Depth
6.1 km below the surface
Felt
no reports yet
Nearest
Fremont County, 58 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3289 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 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 44.7207, -111.3040. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 58 km (36 mi) NNE of here earthquakes near Fremont County
Madison County, MT 83 km (51 mi) SE of here earthquakes near Madison County
Gallatin County, MT 89 km (56 mi) S of here earthquakes near Gallatin County
Clark County, ID 96 km (60 mi) ENE of here earthquakes near Clark County
Teton County, WY 102 km (64 mi) NW of here earthquakes near Teton County
Park County, MT 102 km (64 mi) SW of here earthquakes near Park County

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

Aftershocks so far

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

  1. 1.9 12 km NE of West Yellowstone, Montana
  2. 1.5 12 km NE of West Yellowstone, Montana
  3. 1.7 12 km NE of West Yellowstone, Montana
  4. 1.6 12 km NE of West Yellowstone, Montana
  5. 2.0 11 km NE of West Yellowstone, Montana
  6. 1.6 11 km NE of West Yellowstone, Montana
  7. 1.6 10 km E of Hebgen Lake Estates, Montana
  8. 1.6 12 km NE of West Yellowstone, Montana
  9. 1.8 12 km NE of West Yellowstone, Montana
  10. 1.9 12 km NE of West Yellowstone, Montana
  11. 2.7 12 km NE of West Yellowstone, Montana
  12. 2.2 11 km NE of West Yellowstone, Montana
  13. 2.0 12 km NE of West Yellowstone, Montana
  14. 1.5 12 km NE of West Yellowstone, Montana
  15. 2.4 12 km WSW of West Yellowstone, 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 4.4 on 2017-06-16 — it released about 2,300 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.