QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

15 km S of Mammoth, Wyoming

· 5.8 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 70 kmGallatin County 84 kmTeton County 91 kmFremont County 94 kmPark County 95 kmMadison County 110 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 2.8 (ml)
Depth
5.8 km below the surface
Felt
no reports yet
Nearest
Park County, 70 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2291 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 44.8417, -110.6868. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 70 km (44 mi) S of here earthquakes near Park County
Gallatin County, MT 84 km (52 mi) SSE of here earthquakes near Gallatin County
Teton County, WY 91 km (56 mi) NNW of here earthquakes near Teton County
Fremont County, ID 94 km (58 mi) NE of here earthquakes near Fremont County
Park County, WY 95 km (59 mi) WNW of here earthquakes near Park County
Madison County, MT 110 km (69 mi) ESE of here earthquakes near Madison 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. 1.5 32 km SE of West Yellowstone, Montana
  2. 1.5 10 km ENE of West Yellowstone, Montana
  3. 1.7 20 km S of Mammoth, Wyoming
  4. 1.6 39 km SSE of Mammoth, Wyoming
  5. 1.6 25 km S of Mammoth, Wyoming
  6. 1.9 6 km E of Hebgen Lake Estates, Montana
  7. 1.5 12 km NE of West Yellowstone, Montana
  8. 1.6 34 km SW of Silver Gate, Montana
  9. 3.1 5 km ESE of Hebgen Lake Estates, Montana
  10. 2.9 Wyoming
  11. 1.8 Wyoming
  12. 1.9 10 km ENE of West Yellowstone, Montana
  13. 2.1 10 km ENE of West Yellowstone, Montana
  14. 2.1 10 km ENE of West Yellowstone, Montana
  15. 1.5 10 km ENE 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 220 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.