QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

27 km SE of Mammoth, Wyoming

· 10 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 72 kmPark County 76 kmTeton County 86 kmGallatin County 97 kmFremont County 107 kmSweet Grass County 117 kmCarbon County 120 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
10 km below the surface
Felt
no reports yet
Nearest
Park County, 72 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 95 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 44.8178, -110.4367. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 72 km (45 mi) S of here earthquakes near Park County
Park County, WY 76 km (47 mi) WNW of here earthquakes near Park County
Teton County, WY 86 km (53 mi) N of here earthquakes near Teton County
Gallatin County, MT 97 km (60 mi) SE of here earthquakes near Gallatin County
Fremont County, ID 107 km (66 mi) NE of here earthquakes near Fremont County
Sweet Grass County, MT 117 km (73 mi) SSW of here earthquakes near Sweet Grass County

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

Aftershocks so far

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

  1. 1.5 37 km S of Silver Gate, Montana
  2. 0.5 21 km ENE of West Yellowstone, Montana
  3. 0.9 41 km SSE of Mammoth, Wyoming
  4. 0.4 17 km SSW of Mammoth, Wyoming
  5. 1.6 22 km SSW of Mammoth, Wyoming
  6. 1.8 25 km SSW of Mammoth, Wyoming
  7. 1.6 19 km SSW of Mammoth, Wyoming
  8. 1.5 62 km ESE of West Yellowstone, Montana
  9. 1.6 49 km ESE of West Yellowstone, Montana
  10. 1.8 34 km S of Silver Gate, Montana
  11. 1.9 24 km S of Silver Gate, Montana
  12. 2.0 24 km SSW of Silver Gate, Montana
  13. 1.5 29 km ESE of West Yellowstone, Montana
  14. 2.0 37 km S of Silver Gate, Montana
  15. 1.9 24 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 4.2 on 2022-05-11 — it released about 4,600 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.