Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near West Yellowstone, MT
No earthquake was likely felt in West Yellowstone in the 24 hours to 7:46 am MST (14:46 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 2.5 earthquake was recorded 27 km (17 mi) east-northeast of West Yellowstone, MT, at 4:01 am MDT on 21 September 2022 (10:01 UTC), 7.1 km deep.
USGS: 23 km SSW of Mammoth, Wyoming
- When
- 4:01 am MDT on 21 September 2022 ()
- Where
- 27 km (17 mi) east-northeast of West Yellowstone, MT · earthquakes near West Yellowstone
- Magnitude
- M 2.5 (ml)
- Depth
- 7.1 km below the surface
- Felt
- no reports yet
- Nearest
- Park County, 79 km NNE
- Nearest mapped fault
- Red Canyon fault, 16 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 1446 days ago
Earthquake alerts for West Yellowstone, MT
Get a notification in this browser when USGS records an earthquake near West Yellowstone, MT. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 21 km (13 mi) from the epicentre. In West Yellowstone, 27 km away, the estimate is intensity II (weak). 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 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 78,000× the energy of this one
- Magna, Utah 2020 M 5.7 55,000× the energy of this one
- Around the size people start to feel M 3.0 4.9× the energy of this one
- This earthquake M 2.5 about 190 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 540 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 7.2 The 1959 Hebgen Lake, Montana Earthquake · 32 km W of this epicentre
- 6.5 14 km N of Madison Junction, Wyoming · 7 km W of this epicentre
- 6.3 22 km SW of Mammoth, Wyoming · 7 km NW of this epicentre
- 6.0 21 km E of West Yellowstone, Montana · 14 km SSW of this epicentre
- 5.9 26 km SSE of Mammoth, Wyoming · 16 km ESE 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 44.7738, -110.7978. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Park County, MT | 79 km (49 mi) | NNE | earthquakes near Park County |
| Fremont County, ID | 82 km (51 mi) | SW | earthquakes near Fremont County |
| Teton County, WY | 86 km (53 mi) | SSE | earthquakes near Teton County |
| Gallatin County, MT | 88 km (54 mi) | NNW | earthquakes near Gallatin County |
| Park County, WY | 100 km (62 mi) | ESE | earthquakes near Park County |
| Madison County, MT | 107 km (66 mi) | NW | earthquakes near Madison County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.0 23 km SSW of Mammoth, Wyoming
- 2.0 Wyoming
- 2.2 Wyoming
- 2.1 23 km SSW of Mammoth, Wyoming
- 2.0 46 km SSE of Mammoth, Wyoming
- 1.8 46 km SSE of Mammoth, Wyoming
- 2.5 Wyoming
- 2.0 23 km SSW of Mammoth, Wyoming
- 1.6 Wyoming
- 1.7 21 km SSW of Mammoth, Wyoming
- 2.6 Wyoming
- 1.6 34 km E of West Yellowstone, Montana
- 2.5 23 km SSW of Mammoth, Wyoming
- 2.0 23 km SSW of Mammoth, Wyoming
- 1.8 23 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.