QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

27 km W of Hebgen Lake Estates, Montana

· 14 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 64 kmMadison County 66 kmClark County 85 kmGallatin County 86 kmPark County 108 kmMadison County 112 kmBeaverhead County 113 kmTeton County 118 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
14 km below the surface
Felt
no reports yet
Nearest
Fremont County, 64 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2782 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 44.7945, -111.5405. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 64 km (40 mi) N of here earthquakes near Fremont County
Madison County, MT 66 km (41 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 108 km (67 mi) SW of here earthquakes near Park County
Madison County, ID 112 km (70 mi) N of here earthquakes near Madison County

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

Aftershocks so far

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

  1. 2.4 27 km WNW of Hebgen Lake Estates, Montana
  2. 1.7 43 km NE of Spencer, Idaho
  3. 1.9 29 km SSE of Virginia City, Montana
  4. 2.0 30 km SSE of Virginia City, Montana
  5. 1.5 30 km SSE of Virginia City, Montana
  6. 1.5 27 km W of Hebgen Lake Estates, Montana
  7. 2.4 34 km W of Hebgen Lake Estates, Montana
  8. 1.6 42 km NNE of Spencer, Idaho
  9. 3.0 17 km WNW of Hebgen Lake Estates, Montana
  10. 2.2 42 km NE of Spencer, Idaho
  11. 1.8 42 km NE of Spencer, Idaho
  12. 2.0 43 km NE of Spencer, Idaho
  13. 2.2 42 km NE of Spencer, Idaho
  14. 1.6 43 km NE of Spencer, Idaho
  15. 2.7 40 km NNE of Spencer, Idaho

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 5,100 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.