Earthquake · reviewed by a seismologist
M 1.8ml
27 km SE of Mammoth, Wyoming
Yes. A magnitude 1.8 earthquake was recorded 27 km SE of Mammoth, Wyoming, at 8:59 am MDT on 24 June 2026 (14:59 UTC), 10 km deep.
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Park County, 72 km N
- Nearest mapped fault
- Mirror Plateau faults, 11 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 140 days ago
Earthquake alerts for West Yellowstone, MT
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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 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 8 km (5 mi) from the epicentre. 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 760,000× the energy of this one
- Around the size people start to feel M 3.0 68× the energy of this one
- This earthquake M 1.8 about 14 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 4.2 on 2022-05-11 — about 4,600 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 14 km N of Madison Junction, Wyoming · 36 km W of this epicentre
- 6.3 22 km SW of Mammoth, Wyoming · 34 km W of this epicentre
- 6.0 21 km E of West Yellowstone, Montana · 37 km WSW of this epicentre
- 5.9 26 km SSE of Mammoth, Wyoming · 16 km WSW of this epicentre
- 5.7 13 km SSW of Mammoth, Wyoming · 26 km WNW 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 44.8178, -110.4367. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Park County, MT | 72 km (45 mi) | N | earthquakes near Park County |
| Park County, WY | 76 km (47 mi) | ESE | earthquakes near Park County |
| Teton County, WY | 86 km (53 mi) | S | earthquakes near Teton County |
| Gallatin County, MT | 97 km (60 mi) | NW | earthquakes near Gallatin County |
| Fremont County, ID | 107 km (66 mi) | SW | earthquakes near Fremont County |
| Sweet Grass County, MT | 117 km (73 mi) | NNE | earthquakes near Sweet Grass 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.
- 0.4 49 km SSE of Mammoth, Wyoming
- 1.5 61 km ESE of West Yellowstone, Montana
- 0.6 48 km SSE of Mammoth, Wyoming
- 0.6 19 km ENE of West Yellowstone, Montana
- 0.9 34 km S of Silver Gate, Montana
- 1.2 24 km SSE of Mammoth, Wyoming
- 0.7 24 km SSW of Mammoth, Wyoming
- 1.5 35 km S of Silver Gate, Montana
- 0.7 51 km SE of Mammoth, Wyoming
- 1.1 35 km ESE of West Yellowstone, Montana
- 0.8 33 km ESE of West Yellowstone, Montana
- 1.0 30 km ESE of West Yellowstone, Montana
- 0.8 29 km ESE of West Yellowstone, Montana
- 0.6 29 km ESE of West Yellowstone, Montana
- 0.6 29 km ESE 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
- 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.