QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

30 km W of Hebgen Lake Estates, Montana

· 10 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 63 kmFremont County 66 kmGallatin County 85 kmClark County 85 kmPark County 109 kmBeaverhead County 110 kmMadison County 114 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 2.9 (ml)
Depth
10 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Madison County, 63 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 99 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 44.8129, -111.5684. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 63 km (39 mi) SSE of here earthquakes near Madison County
Fremont County, ID 66 km (41 mi) N of here earthquakes near Fremont County
Gallatin County, MT 85 km (53 mi) SSW of here earthquakes near Gallatin County
Clark County, ID 85 km (53 mi) NE of here earthquakes near Clark County
Park County, MT 109 km (67 mi) SW of here earthquakes near Park County
Beaverhead County, MT 110 km (68 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

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

  1. 0.0 2 km ENE of Hebgen Lake Estates, Montana
  2. 0.3 7 km NE of West Yellowstone, Montana
  3. 0.2 8 km NE of West Yellowstone, Montana
  4. 0.1 6 km NNE of West Yellowstone, Montana
  5. -0.1 1 km SSE of Hebgen Lake Estates, Montana
  6. 1.2 5 km E of Hebgen Lake Estates, Montana
  7. 0.4 29 km WNW of Hebgen Lake Estates, Montana
  8. 0.4 5 km E of Hebgen Lake Estates, Montana
  9. 0.1 31 km WNW of Hebgen Lake Estates, Montana
  10. 0.3 24 km WNW of Hebgen Lake Estates, Montana
  11. -0.2 4 km N of West Yellowstone, Montana
  12. 0.0 25 km WNW of Hebgen Lake Estates, Montana
  13. -0.2 5 km E of Hebgen Lake Estates, Montana
  14. -0.0 3 km SSE of Hebgen Lake Estates, Montana
  15. 2.8 3 km ESE 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 150 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.