QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

38 km WNW of Hebgen Lake Estates, Montana

· 10.0 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 55 kmFremont County 73 kmGallatin County 83 kmClark County 84 kmBeaverhead County 102 kmPark County 110 kmMadison 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 1.9 (ml)
Depth
10.0 km below the surface
Felt
no reports yet
Nearest
Madison County, 55 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1803 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 44.8622, -111.6572. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 55 km (34 mi) SSE of here earthquakes near Madison County
Fremont County, ID 73 km (45 mi) N of here earthquakes near Fremont County
Gallatin County, MT 83 km (51 mi) SSW of here earthquakes near Gallatin County
Clark County, ID 84 km (52 mi) NE of here earthquakes near Clark County
Beaverhead County, MT 102 km (63 mi) ESE of here earthquakes near Beaverhead County
Park County, MT 110 km (69 mi) SW of here earthquakes near Park County

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

Aftershocks so far

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

  1. 1.6 42 km S of Alder, Montana
  2. 2.0 16 km WSW of West Yellowstone, Montana
  3. 2.2 32 km S of Virginia City, Montana
  4. 1.5 29 km S of Ennis, Montana
  5. 1.6 23 km WNW of Hebgen Lake Estates, Montana
  6. 1.5 Idaho-Montana border region
  7. 1.9 4 km WNW of Hebgen Lake Estates, Montana
  8. 1.8 53 km NNE of Spencer, Idaho
  9. 1.7 36 km NE of Spencer, Idaho
  10. 1.9 37 km SW of Big Sky, Montana
  11. 1.8 7 km SW of West Yellowstone, Montana
  12. 2.5 46 km NW of Island Park, Idaho
  13. 1.6 28 km SE of Virginia City, Montana
  14. 1.8 41 km W of Hebgen Lake Estates, Montana
  15. 1.7 28 km S of Ennis, 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 4.3 on 2016-06-13 — it released about 4,700 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.