QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

21 km N of Hebgen Lake Estates, Montana

· 3.3 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 62 kmMadison County 70 kmPark County 76 kmFremont County 86 kmTeton County 118 kmClark 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 1.8 (ml)
Depth
3.3 km below the surface
Felt
no reports yet
Nearest
Gallatin County, 62 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1895 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 44.9588, -111.1882. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 62 km (39 mi) S of here earthquakes near Gallatin County
Madison County, MT 70 km (43 mi) SE of here earthquakes near Madison County
Park County, MT 76 km (47 mi) SW of here earthquakes near Park County
Fremont County, ID 86 km (53 mi) NNE of here earthquakes near Fremont County
Teton County, WY 118 km (73 mi) NNW of here earthquakes near Teton County
Clark County, ID 119 km (74 mi) NE of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 2.1 22 km SSW of Mammoth, Wyoming
  2. 1.6 23 km SSW of Mammoth, Wyoming
  3. 2.5 22 km SSW of Mammoth, Wyoming
  4. 1.6 17 km SSE of Big Sky, Montana
  5. 1.6 20 km ENE of Hebgen Lake Estates, Montana
  6. 1.5 23 km W of Hebgen Lake Estates, Montana
  7. 1.8 28 km S of Mammoth, Wyoming
  8. 1.6 19 km ENE of West Yellowstone, Montana
  9. 1.9 22 km SSW of Mammoth, Wyoming
  10. 2.4 19 km NE of West Yellowstone, Montana
  11. 1.8 29 km S of Mammoth, Wyoming
  12. 1.9 28 km S of Mammoth, Wyoming
  13. 1.7 27 km S of Mammoth, Wyoming
  14. 1.6 21 km ENE of Hebgen Lake Estates, Montana
  15. 1.5 26 km W 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 7,900 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.