QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

18 km WNW of Hebgen Lake Estates, Montana

· 7.8 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 67 kmFremont County 70 kmGallatin County 77 kmPark County 96 kmClark County 98 kmTeton County 117 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 1.7 (ml)
Depth
7.8 km below the surface
Felt
no reports yet
Nearest
Madison County, 67 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 678 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 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 900,000× the energy of this one
  3. Around the size people start to feel M 3.0 80× the energy of this one
  4. This earthquake M 1.7 about 12 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 44.8428, -111.3937. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 67 km (42 mi) SE of here earthquakes near Madison County
Fremont County, ID 70 km (43 mi) N of here earthquakes near Fremont County
Gallatin County, MT 77 km (48 mi) SSW of here earthquakes near Gallatin County
Park County, MT 96 km (60 mi) SW of here earthquakes near Park County
Clark County, ID 98 km (61 mi) NE of here earthquakes near Clark County
Teton County, WY 117 km (73 mi) NW of here earthquakes near Teton County

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

Aftershocks so far

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

  1. 1.7 23 km SSW of Mammoth, Wyoming
  2. 2.0 37 km W of Hebgen Lake Estates, Montana
  3. 1.5 16 km NE of West Yellowstone, Montana
  4. 1.9 21 km S of Ennis, Montana
  5. 1.5 16 km NE of West Yellowstone, Montana
  6. 2.8 16 km NE of West Yellowstone, Montana
  7. 1.5 16 km NE of West Yellowstone, Montana
  8. 1.6 28 km SE of Virginia City, Montana
  9. 2.3 47 km NW of Island Park, Idaho
  10. 1.6 31 km SSE of Virginia City, Montana
  11. 2.1 16 km E of Hebgen Lake Estates, Montana
  12. 1.8 40 km NNE of Spencer, Idaho
  13. 1.6 3 km SSE of West Yellowstone, Montana
  14. 1.9 26 km NNW of Hebgen Lake Estates, Montana
  15. 1.7 22 km WNW of Hebgen Lake Estates, 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 8,800 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.