QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km S of West Yellowstone, Montana

· 7.8 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 55 kmTeton County 84 kmTeton County 97 kmGallatin County 99 kmMadison County 100 kmPark County 103 kmMadison County 104 kmClark County 106 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 1.8 (ml)
Depth
7.8 km below the surface
Felt
no reports yet
Nearest
Fremont County, 55 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 724 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 44.6318, -111.1035. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 55 km (34 mi) NNE of here earthquakes near Fremont County
Teton County, WY 84 km (52 mi) NW of here earthquakes near Teton County
Teton County, ID 97 km (60 mi) N of here earthquakes near Teton County
Gallatin County, MT 99 km (61 mi) S of here earthquakes near Gallatin County
Madison County, MT 100 km (62 mi) SE of here earthquakes near Madison County
Park County, MT 103 km (64 mi) SSW of here earthquakes near Park County

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

Aftershocks so far

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

  1. 1.6 30 km ESE of West Yellowstone, Montana
  2. 1.7 29 km WNW of Hebgen Lake Estates, Montana
  3. 2.0 14 km SSW of Mammoth, Wyoming
  4. 1.6 6 km NNE of West Yellowstone, Montana
  5. 1.5 6 km NNE of West Yellowstone, Montana
  6. 1.9 4 km E of Hebgen Lake Estates, Montana
  7. 2.1 8 km NE of West Yellowstone, Montana
  8. 1.7 8 km NE of West Yellowstone, Montana
  9. 2.0 18 km ENE of West Yellowstone, Montana
  10. 2.3 16 km ENE of Hebgen Lake Estates, Montana
  11. 1.9 6 km ESE of West Yellowstone, Montana
  12. 1.9 6 km ESE of West Yellowstone, Montana
  13. 2.1 6 km ESE of West Yellowstone, Montana
  14. 1.6 6 km SE of Hebgen Lake Estates, Montana
  15. 1.5 21 km W of Hebgen Lake Estates, 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 8,200 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.