QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

45 km NW of Island Park, Idaho

· 10 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 59 kmClark County 63 kmMadison County 71 kmBeaverhead County 99 kmMadison County 102 kmGallatin County 104 kmJefferson County 108 kmTeton 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 2.1 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Fremont County, 59 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1133 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 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 44.6960, -111.8042. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 59 km (37 mi) NNW of here earthquakes near Fremont County
Clark County, ID 63 km (39 mi) NE of here earthquakes near Clark County
Madison County, MT 71 km (44 mi) S of here earthquakes near Madison County
Beaverhead County, MT 99 km (61 mi) ESE of here earthquakes near Beaverhead County
Madison County, ID 102 km (63 mi) N of here earthquakes near Madison County
Gallatin County, MT 104 km (65 mi) SSW of here earthquakes near Gallatin County

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

Aftershocks so far

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

  1. 1.8 40 km NNE of Spencer, Idaho
  2. 1.9 26 km NNW of Hebgen Lake Estates, Montana
  3. 1.7 22 km WNW of Hebgen Lake Estates, Montana
  4. 1.6 43 km W of Hebgen Lake Estates, Montana
  5. 1.5 28 km S of Ennis, Montana
  6. 1.6 31 km NNE of Spencer, Idaho
  7. 1.7 29 km WNW of Hebgen Lake Estates, Montana
  8. 1.5 21 km W of Hebgen Lake Estates, Montana
  9. 1.6 40 km NE of Spencer, Idaho
  10. 1.9 31 km SSE of Virginia City, Montana
  11. 1.6 29 km SSE of Virginia City, Montana
  12. 2.2 41 km NE of Spencer, Idaho
  13. 1.8 25 km WNW of Hebgen Lake Estates, Montana
  14. 2.1 29 km WNW of Hebgen Lake Estates, Montana
  15. 1.9 33 km S of Virginia City, 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 4.3 on 2016-06-13 — it released about 2,100 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.