QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

28 km W of Hebgen Lake Estates, Montana

· 10 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 65 kmMadison County 65 kmClark County 85 kmGallatin County 86 kmPark County 109 kmBeaverhead County 112 kmMadison County 113 kmTeton County 119 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
10 km below the surface
Felt
no reports yet
Nearest
Fremont County, 65 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2381 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 44.7988, -111.5518. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 65 km (40 mi) N of here earthquakes near Fremont County
Madison County, MT 65 km (40 mi) SSE of here earthquakes near Madison County
Clark County, ID 85 km (53 mi) NE of here earthquakes near Clark County
Gallatin County, MT 86 km (53 mi) SSW of here earthquakes near Gallatin County
Park County, MT 109 km (68 mi) SW of here earthquakes near Park County
Beaverhead County, MT 112 km (70 mi) ESE of here earthquakes near Beaverhead 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. 1.9 5 km ESE of Hebgen Lake Estates, Montana
  2. 1.6 9 km E of Hebgen Lake Estates, Montana
  3. 1.5 38 km WNW of Hebgen Lake Estates, Montana
  4. 2.3 41 km NW of Island Park, Idaho
  5. 2.0 36 km NNE of Spencer, Idaho
  6. 1.8 27 km SE of Virginia City, Montana
  7. 2.0 29 km SSE of Virginia City, Montana
  8. 2.4 27 km WNW of Hebgen Lake Estates, Montana
  9. 1.6 28 km WNW of Hebgen Lake Estates, Montana
  10. 1.6 27 km WNW of Hebgen Lake Estates, Montana
  11. 1.6 32 km S of Ennis, Montana
  12. 1.6 23 km WNW of Hebgen Lake Estates, Montana
  13. 2.0 22 km WNW of Hebgen Lake Estates, Montana
  14. 1.8 46 km NNE of Spencer, Idaho
  15. 2.2 1 km SSW 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 2,500 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.