QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

22 km SSW of Mammoth, Wyoming

· 11 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 77 kmFremont County 82 kmGallatin County 83 kmTeton County 91 kmMadison County 102 kmPark County 105 kmTeton County 119 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
11 km below the surface
Felt
no reports yet
Nearest
Park County, 77 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 404 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 44.8043, -110.8518. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 77 km (48 mi) SSW of here earthquakes near Park County
Fremont County, ID 82 km (51 mi) NE of here earthquakes near Fremont County
Gallatin County, MT 83 km (52 mi) SSE of here earthquakes near Gallatin County
Teton County, WY 91 km (56 mi) NNW of here earthquakes near Teton County
Madison County, MT 102 km (63 mi) SE of here earthquakes near Madison County
Park County, WY 105 km (65 mi) WNW of here earthquakes near Park County

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

Aftershocks so far

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

  1. 1.6 22 km SSW of Mammoth, Wyoming
  2. 2.3 23 km SSW of Mammoth, Wyoming
  3. 1.9 7 km ESE of Hebgen Lake Estates, Montana
  4. 2.0 7 km ESE of Hebgen Lake Estates, Montana
  5. 1.6 23 km SSW of Mammoth, Wyoming
  6. 2.5 23 km SSW of Mammoth, Wyoming
  7. 2.2 23 km SSW of Mammoth, Wyoming
  8. 3.7 22 km SSW of Mammoth, Wyoming
  9. 2.7 22 km SSW of Mammoth, Wyoming
  10. 1.8 22 km SSW of Mammoth, Wyoming
  11. 2.3 24 km ENE of West Yellowstone, Montana
  12. 1.6 50 km ESE of West Yellowstone, Montana
  13. 1.5 50 km ESE of West Yellowstone, Montana
  14. 1.6 50 km ESE of West Yellowstone, Montana
  15. 2.0 50 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 2,500 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.