QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

49 km NNE of Spencer, Idaho

· 12 km deep · released about 79 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 63 kmMadison County 63 kmFremont County 69 kmBeaverhead County 87 kmGallatin County 103 kmMadison County 110 kmJefferson County 112 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 2.3 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Clark County, 63 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 112 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 79 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 190,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 79 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 44.7597, -111.9148. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 63 km (39 mi) NNE of here earthquakes near Clark County
Madison County, MT 63 km (39 mi) S of here earthquakes near Madison County
Fremont County, ID 69 km (43 mi) NNW of here earthquakes near Fremont County
Beaverhead County, MT 87 km (54 mi) ESE of here earthquakes near Beaverhead County
Gallatin County, MT 103 km (64 mi) SW of here earthquakes near Gallatin County
Madison County, ID 110 km (68 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

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

  1. 0.4 29 km WNW of Hebgen Lake Estates, Montana
  2. 0.1 31 km WNW of Hebgen Lake Estates, Montana
  3. 0.3 24 km WNW of Hebgen Lake Estates, Montana
  4. 0.0 25 km WNW of Hebgen Lake Estates, Montana
  5. 1.6 44 km NNE of Spencer, Idaho
  6. 2.2 45 km NNE of Spencer, Idaho
  7. 1.9 45 km NNE of Spencer, Idaho
  8. 2.4 45 km NNE of Spencer, Idaho
  9. 1.8 46 km NNE of Spencer, Idaho
  10. 1.9 25 km S of Ennis, Montana
  11. 1.6 34 km SSE of Virginia City, Montana
  12. 1.8 30 km WNW of Hebgen Lake Estates, Montana
  13. 2.7 48 km NE of Spencer, Idaho
  14. 1.7 47 km NW of Island Park, Idaho
  15. 2.4 47 km NW of Island Park, 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 4.3 on 2016-06-13 — it released about 1,200 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.