QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

21 km NE of West Yellowstone, Montana

· 8.1 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 78 kmPark County 81 kmGallatin County 85 kmTeton County 89 kmMadison County 101 kmPark County 108 kmTeton County 116 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
8.1 km below the surface
Felt
no reports yet
Nearest
Fremont County, 78 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 807 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 5.4 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 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 44.7797, -110.8937. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 78 km (49 mi) NE of here earthquakes near Fremont County
Park County, MT 81 km (50 mi) SSW of here earthquakes near Park County
Gallatin County, MT 85 km (53 mi) SSE of here earthquakes near Gallatin County
Teton County, WY 89 km (56 mi) NNW of here earthquakes near Teton County
Madison County, MT 101 km (62 mi) SE of here earthquakes near Madison County
Park County, WY 108 km (67 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

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

  1. 1.6 4 km SSE of Hebgen Lake Estates, Montana
  2. 1.6 20 km SSW of Mammoth, Wyoming
  3. 1.5 23 km SSW of Mammoth, Wyoming
  4. 1.6 24 km SSW of Mammoth, Wyoming
  5. 2.5 24 km SSW of Mammoth, Wyoming
  6. 1.5 24 km SSW of Mammoth, Wyoming
  7. 1.8 24 km SSW of Mammoth, Wyoming
  8. 2.0 24 km SSW of Mammoth, Wyoming
  9. 3.7 24 km SSW of Mammoth, Wyoming
  10. 2.0 2 km ESE of Hebgen Lake Estates, Montana
  11. 1.6 25 km SSW of Mammoth, Wyoming
  12. 2.4 25 km SSW of Mammoth, Wyoming
  13. 1.9 46 km SSE of Mammoth, Wyoming
  14. 1.8 33 km ESE of West Yellowstone, Montana
  15. 2.7 43 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 4.4 on 2017-06-16 — it released about 19,000 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.