QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

3 km ENE of Hebgen Lake Estates, Montana

· 7.3 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 68 kmGallatin County 82 kmMadison County 85 kmPark County 90 kmTeton County 100 kmClark County 110 kmTeton County 113 kmMadison County 117 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
7.3 km below the surface
Felt
no reports yet
Nearest
Fremont County, 68 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2795 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 44.7802, -111.1500. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 68 km (42 mi) NNE of here earthquakes near Fremont County
Gallatin County, MT 82 km (51 mi) S of here earthquakes near Gallatin County
Madison County, MT 85 km (53 mi) SE of here earthquakes near Madison County
Park County, MT 90 km (56 mi) SSW of here earthquakes near Park County
Teton County, WY 100 km (62 mi) NW of here earthquakes near Teton County
Clark County, ID 110 km (68 mi) ENE of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.7 Wyoming
  2. 2.4 28 km ESE of West Yellowstone, Montana
  3. 2.1 29 km ESE of West Yellowstone, Montana
  4. 2.9 29 km ESE of West Yellowstone, Montana
  5. 1.7 17 km NE of West Yellowstone, Montana
  6. 1.9 28 km ESE of West Yellowstone, Montana
  7. 2.1 Wyoming
  8. 1.5 29 km ESE of West Yellowstone, Montana
  9. 1.6 23 km SSW of Mammoth, Wyoming
  10. 2.4 22 km NE of West Yellowstone, Montana
  11. 1.9 23 km NE of West Yellowstone, Montana
  12. 1.6 23 km SSW of Mammoth, Wyoming
  13. 2.1 33 km E of West Yellowstone, Montana
  14. 1.8 36 km E of West Yellowstone, Montana
  15. 2.3 33 km E 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 2,400 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.