QuakeIndex

Earthquake · reviewed by a seismologist

M 0.8ml

Earthquake near West Yellowstone, MT

No earthquake was likely felt in West Yellowstone in the 24 hours to 9:05 am MST (16:05 UTC). The last one was M 2.8, 11 km (7 mi) NNW, at 1:21 am MDT on 8 September 2026, estimated intensity II (weak) in town. Every earthquake near West Yellowstone

This page: a magnitude 0.8 earthquake was recorded 25 km (15 mi) south-southeast of West Yellowstone, MT, at 10:21 am MDT on 31 October 2026 (16:21 UTC), 4.6 km deep.

USGS: 24 km SSE of West Yellowstone, Montana

10:21 am MDT, Oct 31, 2026 · · 4.6 km deep · released about 0.55 lb of TNT

Every earthquake near West Yellowstone Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 49 kmTeton County 63 kmTeton County 80 kmMadison County 92 kmPark County 109 kmClark County 111 kmPark County 117 kmGallatin County 119 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
10:21 am MDT on 31 October 2026 ()
Where
25 km (15 mi) south-southeast of West Yellowstone, MT · earthquakes near West Yellowstone
Montana today
every earthquake in Montana in the last 24 hours
Magnitude
M 0.8 (ml)
Depth
4.6 km below the surface
Felt
no reports yet
Nearest
Fremont County, 49 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 9 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 0.55 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 28,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 1,700× the energy of this one
  4. This earthquake M 0.8 about 0.55 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.4 on 2017-06-16 — about 190,000 times the energy of this one.

Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.2 The 1959 Hebgen Lake, Montana Earthquake · 41 km NNW of this epicentre
  2. 6.5 14 km N of Madison Junction, Wyoming · 35 km N of this epicentre
  3. 6.3 22 km SW of Mammoth, Wyoming · 40 km NNE of this epicentre
  4. 6.0 21 km E of West Yellowstone, Montana · 23 km NNE of this epicentre
  5. 5.9 26 km SSE of Mammoth, Wyoming · 43 km NE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 44.4590, -110.9725. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fremont County, ID 49 km (30 mi) WSW earthquakes near Fremont County
Teton County, WY 63 km (39 mi) SE earthquakes near Teton County
Teton County, ID 80 km (50 mi) SSW earthquakes near Teton County
Madison County, ID 92 km (57 mi) SW earthquakes near Madison County
Park County, WY 109 km (68 mi) E earthquakes near Park County
Clark County, ID 111 km (69 mi) W earthquakes near Clark County

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

Aftershocks so far

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

  1. 0.8 39 km SSE of Mammoth, Wyoming
  2. 0.8 37 km SE of West Yellowstone, Montana
  3. 0.5 18 km NE of West Yellowstone, Montana
  4. 0.8 18 km NE of West Yellowstone, Montana
  5. -0.4 1 km W of Hebgen Lake Estates, Montana
  6. 0.3 16 km ENE of Island Park, Idaho
  7. 1.7 17 km NE of Island Park, Idaho
  8. 0.6 17 km ENE of Island Park, Idaho
  9. 1.5 16 km W of Hebgen Lake Estates, Montana
  10. 0.7 22 km SSW of Mammoth, Wyoming
  11. 0.1 6 km SE of Hebgen Lake Estates, Montana
  12. 0.3 5 km SE of Hebgen Lake Estates, Montana
  13. 0.2 14 km W of Hebgen Lake Estates, Montana
  14. -0.0 1 km WSW of Hebgen Lake Estates, Montana
  15. -0.6 4 km SE 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.