QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

23 km SSW of Mammoth, Wyoming

· 7.7 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 79 kmFremont County 83 kmTeton County 86 kmGallatin County 88 kmPark County 100 kmMadison County 107 kmTeton County 118 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
7.7 km below the surface
Felt
no reports yet
Nearest
Park County, 79 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2986 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 44.7760, -110.7912. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 79 km (49 mi) SSW of here earthquakes near Park County
Fremont County, ID 83 km (52 mi) NE of here earthquakes near Fremont County
Teton County, WY 86 km (53 mi) NNW of here earthquakes near Teton County
Gallatin County, MT 88 km (54 mi) SSE of here earthquakes near Gallatin County
Park County, WY 100 km (62 mi) WNW of here earthquakes near Park County
Madison County, MT 107 km (67 mi) SE of here earthquakes near Madison 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. 1.8 3 km SSE of Hebgen Lake Estates, Montana
  2. 1.6 11 km NNE of West Yellowstone, Montana
  3. 1.8 47 km SE of Mammoth, Wyoming
  4. 1.6 3 km ENE of Hebgen Lake Estates, Montana
  5. 2.4 7 km ENE of Hebgen Lake Estates, Montana
  6. 1.8 7 km ENE of Hebgen Lake Estates, Montana
  7. 2.0 8 km ENE of Hebgen Lake Estates, Montana
  8. 1.7 8 km ENE of Hebgen Lake Estates, Montana
  9. 1.6 7 km ENE of Hebgen Lake Estates, Montana
  10. 1.8 8 km ENE of Hebgen Lake Estates, Montana
  11. 1.5 8 km ENE of Hebgen Lake Estates, Montana
  12. 1.9 7 km ENE of Hebgen Lake Estates, Montana
  13. 2.0 26 km ESE of West Yellowstone, Montana
  14. 1.6 46 km SE of West Yellowstone, Montana
  15. 2.1 23 km SW of Mammoth, Wyoming

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 2,100 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.