QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

25 km WNW of Hebgen Lake Estates, Montana

· 10 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 64 kmFremont County 69 kmGallatin County 80 kmClark County 91 kmPark County 103 kmBeaverhead County 115 kmMadison County 117 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
10 km below the surface
Felt
no reports yet
Nearest
Madison County, 64 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 543 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 14 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 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 44.8355, -111.4942. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 64 km (40 mi) SSE of here earthquakes near Madison County
Fremont County, ID 69 km (43 mi) N of here earthquakes near Fremont County
Gallatin County, MT 80 km (50 mi) SSW of here earthquakes near Gallatin County
Clark County, ID 91 km (57 mi) NE of here earthquakes near Clark County
Park County, MT 103 km (64 mi) SW of here earthquakes near Park County
Beaverhead County, MT 115 km (71 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

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

  1. 2.0 7 km ESE of Hebgen Lake Estates, Montana
  2. 2.0 7 km ESE of Hebgen Lake Estates, Montana
  3. 1.8 47 km NE of Spencer, Idaho
  4. 1.6 6 km SE of Hebgen Lake Estates, Montana
  5. 1.7 27 km W of Hebgen Lake Estates, Montana
  6. 1.5 46 km NE of Spencer, Idaho
  7. 1.7 14 km WNW of Hebgen Lake Estates, Montana
  8. 1.7 27 km W of Hebgen Lake Estates, Montana
  9. 1.6 27 km W of Hebgen Lake Estates, Montana
  10. 1.6 32 km W of Hebgen Lake Estates, Montana
  11. 1.7 26 km W of Hebgen Lake Estates, Montana
  12. 1.8 26 km W of Hebgen Lake Estates, Montana
  13. 1.5 26 km W of Hebgen Lake Estates, Montana
  14. 2.3 26 km W of Hebgen Lake Estates, Montana
  15. 3.1 27 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 7,700 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.