QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

23 km WNW of Corwin Springs, Montana

· 13 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 37 kmPark County 51 kmMadison County 68 kmSweet Grass County 111 kmFremont County 113 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 1.5 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Gallatin County, 37 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 798 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 45.1925, -111.0603. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 37 km (23 mi) SSE of here earthquakes near Gallatin County
Park County, MT 51 km (32 mi) SW of here earthquakes near Park County
Madison County, MT 68 km (43 mi) ESE of here earthquakes near Madison County
Sweet Grass County, MT 111 km (69 mi) SW of here earthquakes near Sweet Grass County
Fremont County, ID 113 km (70 mi) NNE of here earthquakes near Fremont County
Jefferson County, MT 129 km (80 mi) SE of here earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 1.9 22 km SSW of Mammoth, Wyoming
  2. 1.5 23 km SSW of Mammoth, Wyoming
  3. 1.7 23 km SSW of Mammoth, Wyoming
  4. 2.8 16 km NE of West Yellowstone, Montana
  5. 1.7 13 km S of Bozeman, Montana
  6. 2.1 16 km E of Hebgen Lake Estates, Montana
  7. 1.5 14 km NNW of Emigrant, Montana
  8. 1.9 26 km NNW of Hebgen Lake Estates, Montana
  9. 1.7 22 km WNW of Hebgen Lake Estates, Montana
  10. 1.6 6 km E of Hebgen Lake Estates, Montana
  11. 2.1 6 km E of Hebgen Lake Estates, Montana
  12. 1.6 3 km ESE of Hebgen Lake Estates, Montana
  13. 2.7 3 km ENE of Hebgen Lake Estates, Montana
  14. 2.2 10 km ENE of Hebgen Lake Estates, Montana
  15. 1.7 29 km WNW 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 17,000 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.