QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

57 km SSE of Mammoth, Wyoming

· 2.6 km deep · released about 490 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Teton County 52 kmPark County 60 kmFremont County 96 kmPark County 106 kmTeton County 108 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 (md)
Depth
2.6 km below the surface
Felt
no reports yet
Nearest
Teton County, 52 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 490 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 31,000× 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 1.9× the energy of this one
  4. This earthquake M 2.8 about 490 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 44.5178, -110.3538. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Teton County, WY 52 km (33 mi) N of here earthquakes near Teton County
Park County, WY 60 km (38 mi) W of here earthquakes near Park County
Fremont County, ID 96 km (60 mi) ENE of here earthquakes near Fremont County
Park County, MT 106 km (66 mi) S of here earthquakes near Park County
Teton County, ID 108 km (67 mi) NE of here earthquakes near Teton County
Gallatin County, MT 128 km (80 mi) SSE of here earthquakes near Gallatin County

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

Aftershocks so far

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

  1. 1.7 45 km ESE of West Yellowstone, Montana
  2. 1.5 49 km ESE of West Yellowstone, Montana
  3. 2.0 45 km ESE of West Yellowstone, Montana
  4. 1.6 49 km ESE of West Yellowstone, Montana
  5. 1.9 46 km ESE of West Yellowstone, Montana
  6. 1.8 47 km ESE of West Yellowstone, Montana
  7. 1.7 46 km ESE of West Yellowstone, Montana
  8. 2.0 Wyoming
  9. 1.9 49 km ESE of West Yellowstone, Montana
  10. 1.5 47 km ESE of West Yellowstone, Montana
  11. 2.1 34 km S of Silver Gate, Montana
  12. 2.1 48 km SE of West Yellowstone, Montana
  13. 1.9 46 km SE of West Yellowstone, Montana
  14. 2.0 46 km SE of West Yellowstone, Montana
  15. 1.8 46 km SE 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 4.2 on 2022-05-11 — it released about 130 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.