QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near West Yellowstone, MT

No earthquake was likely felt in West Yellowstone in the 24 hours to 8:28 am MST (15:28 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 1.5 earthquake was recorded 46 km (28 mi) east-southeast of West Yellowstone, MT, at 11:36 am MDT on 27 May 2025 (17:36 UTC), 2.3 km deep.

USGS: 45 km ESE of West Yellowstone, Montana

11:36 am MDT, May 27, 2025 · · 2.3 km deep · released about 5.9 lb of TNT

Every earthquake near West Yellowstone Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Teton County 57 kmPark County 76 kmFremont County 83 kmPark County 101 kmTeton County 103 kmGallatin County 118 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
11:36 am MDT on 27 May 2025 ()
Where
46 km (28 mi) east-southeast of West Yellowstone, MT · earthquakes near West Yellowstone
Montana today
every earthquake in Montana in the last 24 hours
Magnitude
M 1.5 (ml)
Depth
2.3 km below the surface
Felt
no reports yet
Nearest
Teton County, 57 km S
Nearest mapped fault
Eagle Bay fault, 12 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 533 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 10 km (6 mi) from the epicentre. In West Yellowstone, 46 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 5.9 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 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 18,000 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.5 14 km N of Madison Junction, Wyoming · 36 km NW of this epicentre
  2. 6.3 22 km SW of Mammoth, Wyoming · 38 km NW of this epicentre
  3. 6.0 21 km E of West Yellowstone, Montana · 25 km WNW of this epicentre
  4. 5.9 26 km SSE of Mammoth, Wyoming · 22 km NNW of this epicentre
  5. 5.7 13 km SSW of Mammoth, Wyoming · 38 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 44.5517, -110.5483. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Teton County, WY 57 km (35 mi) S earthquakes near Teton County
Park County, WY 76 km (47 mi) E earthquakes near Park County
Fremont County, ID 83 km (52 mi) WSW earthquakes near Fremont County
Park County, MT 101 km (63 mi) N earthquakes near Park County
Teton County, ID 103 km (64 mi) SSW earthquakes near Teton County
Gallatin County, MT 118 km (73 mi) NNW 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. 1.5 23 km SSW of Mammoth, Wyoming
  2. 3.1 22 km SSW of Mammoth, Wyoming
  3. 1.5 23 km SSW of Mammoth, Wyoming
  4. 3.3 22 km SSW of Mammoth, Wyoming
  5. 1.7 23 km NE of West Yellowstone, Montana
  6. 1.5 21 km SSW of Mammoth, Wyoming
  7. 1.8 55 km SE of West Yellowstone, Montana
  8. 1.9 48 km SSE of Mammoth, Wyoming
  9. 1.8 24 km SSW of Mammoth, Wyoming
  10. 2.1 22 km SSW of Mammoth, Wyoming
  11. 2.0 34 km S of Silver Gate, Montana
  12. 1.6 36 km SE of West Yellowstone, Montana
  13. 1.8 36 km S of Silver Gate, Montana
  14. 1.5 23 km SW of Mammoth, Wyoming
  15. 1.7 22 km SSW of Mammoth, Wyoming

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.