QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near West Yellowstone, MT

No earthquake was likely felt in West Yellowstone in the 24 hours to 4:56 pm MST (23:56 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 1.7 earthquake was recorded 48 km (30 mi) southeast of West Yellowstone, MT, at 4:13 am MDT on 15 October 2025 (10:13 UTC), 4.1 km deep.

USGS: 48 km SE of West Yellowstone, Montana

4:13 am MDT, Oct 15, 2025 · · 4.1 km deep · released about 11 lb of TNT

Every earthquake near West Yellowstone Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Teton County 41 kmFremont County 69 kmTeton County 82 kmPark County 84 kmMadison County 104 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
4:13 am MDT on 15 October 2025 ()
Where
48 km (30 mi) southeast of West Yellowstone, MT · earthquakes near West Yellowstone
Montana today
every earthquake in Montana in the last 24 hours
Magnitude
M 1.7 (ml)
Depth
4.1 km below the surface
Felt
no reports yet
Nearest
Teton County, 41 km SSE
Nearest mapped fault
East Mount Sheridan faults, 10 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 392 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In West Yellowstone, 48 km away, the estimate is intensity I (not felt). 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.5 14 km N of Madison Junction, Wyoming · 47 km NNW of this epicentre
  2. 6.0 21 km E of West Yellowstone, Montana · 34 km NNW of this epicentre
  3. 5.9 26 km SSE of Mammoth, Wyoming · 41 km N of this epicentre
  4. 5.5 25 km SSW of Mammoth, Wyoming · 44 km NNW of this epicentre
  5. 5.3 24 km ENE of West Yellowstone, Montana · 42 km NNW 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 44.3798, -110.6445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Teton County, WY 41 km (25 mi) SSE earthquakes near Teton County
Fremont County, ID 69 km (43 mi) WSW earthquakes near Fremont County
Teton County, ID 82 km (51 mi) SSW earthquakes near Teton County
Park County, WY 84 km (52 mi) E earthquakes near Park County
Madison County, ID 104 km (65 mi) SW earthquakes near Madison County
Bonneville County, ID 135 km (84 mi) SW earthquakes near Bonneville County

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

Aftershocks so far

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

  1. 1.8 34 km S of Mammoth, Wyoming
  2. 1.6 52 km NE of Alta, Wyoming
  3. 2.3 64 km NNE of Kelly, Wyoming
  4. 1.8 23 km SSW of Mammoth, Wyoming
  5. 1.8 23 km SSW of Mammoth, Wyoming
  6. 2.0 24 km SSW of Mammoth, Wyoming
  7. 1.6 23 km SSW of Mammoth, Wyoming
  8. 2.1 61 km NNE of Kelly, Wyoming
  9. 1.5 22 km SSW of Mammoth, Wyoming
  10. 1.6 22 km SSW of Mammoth, Wyoming
  11. 1.7 21 km SSW of Mammoth, Wyoming
  12. 1.7 29 km E of West Yellowstone, Montana
  13. 1.6 29 km E of West Yellowstone, Montana
  14. 1.5 12 km SE of West Yellowstone, Montana
  15. 1.6 20 km NE of West Yellowstone, 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.