QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

23 km SSW of Mammoth, Wyoming

· 5.2 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 79 kmFremont County 82 kmGallatin County 86 kmTeton County 87 kmPark County 102 kmMadison County 105 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 1.5 (ml)
Depth
5.2 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 983 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 44.7818, -110.8153. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 79 km (49 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 86 km (54 mi) SSE of here earthquakes near Gallatin County
Teton County, WY 87 km (54 mi) NNW of here earthquakes near Teton County
Park County, WY 102 km (63 mi) WNW of here earthquakes near Park County
Madison County, MT 105 km (65 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

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

  1. 1.6 Idaho-Montana border region
  2. 1.9 17 km E of Hebgen Lake Estates, Montana
  3. 1.8 18 km S of Mammoth, Wyoming
  4. 1.6 23 km SSW of Mammoth, Wyoming
  5. 1.9 23 km SSW of Mammoth, Wyoming
  6. 2.4 23 km SSW of Mammoth, Wyoming
  7. 1.7 21 km S of Mammoth, Wyoming
  8. 2.8 17 km E of Hebgen Lake Estates, Montana
  9. 1.6 17 km NE of West Yellowstone, Montana
  10. 1.8 Wyoming
  11. 1.6 23 km SSW of Mammoth, Wyoming
  12. 1.5 52 km ESE of West Yellowstone, Montana
  13. 1.9 17 km E of Hebgen Lake Estates, Montana
  14. 1.8 18 km E of Hebgen Lake Estates, Montana
  15. 2.1 17 km E of Hebgen Lake Estates, 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 18,000 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.