QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

20 km ENE of West Yellowstone, Montana

· 6.2 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 77 kmPark County 82 kmGallatin County 86 kmTeton County 88 kmMadison County 102 kmPark County 107 kmTeton County 115 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
6.2 km below the surface
Felt
no reports yet
Nearest
Fremont County, 77 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 817 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 38 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 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 44.7670, -110.8840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 77 km (48 mi) NE of here earthquakes near Fremont County
Park County, MT 82 km (51 mi) SSW of here earthquakes near Park County
Gallatin County, MT 86 km (54 mi) SSE of here earthquakes near Gallatin County
Teton County, WY 88 km (55 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 107 km (66 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

55 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. 1.9 51 km SE of West Yellowstone, Montana
  12. 1.6 25 km SSW of Mammoth, Wyoming
  13. 2.4 25 km SSW of Mammoth, Wyoming
  14. 1.9 46 km SSE of Mammoth, Wyoming
  15. 1.8 33 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 2,700 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.