QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

6 km NNW of West Yellowstone, Montana

· 13 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 62 kmGallatin County 89 kmMadison County 92 kmTeton County 93 kmPark County 95 kmTeton County 106 kmClark County 108 kmMadison County 111 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
13 km below the surface
Felt
no reports yet
Nearest
Fremont County, 62 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 748 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 44.7165, -111.1273. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 62 km (39 mi) NNE of here earthquakes near Fremont County
Gallatin County, MT 89 km (55 mi) S of here earthquakes near Gallatin County
Madison County, MT 92 km (57 mi) SE of here earthquakes near Madison County
Teton County, WY 93 km (58 mi) NW of here earthquakes near Teton County
Park County, MT 95 km (59 mi) SSW of here earthquakes near Park County
Teton County, ID 106 km (66 mi) N of here earthquakes near Teton County

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

Aftershocks so far

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

  1. 1.6 3 km ESE of Hebgen Lake Estates, Montana
  2. 2.7 3 km ENE of Hebgen Lake Estates, Montana
  3. 2.2 10 km ENE of Hebgen Lake Estates, Montana
  4. 1.6 30 km ESE of West Yellowstone, Montana
  5. 1.7 29 km WNW of Hebgen Lake Estates, Montana
  6. 2.0 14 km SSW of Mammoth, Wyoming
  7. 1.6 6 km NNE of West Yellowstone, Montana
  8. 1.5 6 km NNE of West Yellowstone, Montana
  9. 1.9 4 km E of Hebgen Lake Estates, Montana
  10. 2.1 8 km NE of West Yellowstone, Montana
  11. 1.7 8 km NE of West Yellowstone, Montana
  12. 2.0 18 km ENE of West Yellowstone, Montana
  13. 2.3 16 km ENE of Hebgen Lake Estates, Montana
  14. 1.9 6 km ESE of West Yellowstone, Montana
  15. 1.9 6 km ESE 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 2,600 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.