Earthquake · reviewed by a seismologist
M 1.8md
48 km S of Silver Gate, Montana
Yes. A magnitude 1.8 earthquake was recorded 48 km S of Silver Gate, Montana, at 12:23 pm MST on 6 March 2025 (19:23 UTC), 13 km deep.
- When
- Montana today
- every earthquake in Montana in the last 24 hours
- Magnitude
- M 1.8 (md)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Park County, 38 km ESE
- Nearest mapped fault
- Mirror Plateau faults, 15 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 615 days ago
Earthquake alerts for Cody, WY
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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 3 km (2 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 13 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 1,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 840,000× the energy of this one
- Around the size people start to feel M 3.0 75× the energy of this one
- This earthquake M 1.8 about 13 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 5,100 times the energy of this one.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 5.9 26 km SSE of Mammoth, Wyoming · 48 km WNW of this epicentre
- 5.1 51 km ESE of West Yellowstone, Montana · 35 km W of this epicentre
- 5.0 62 km ESE of West Yellowstone, Montana · 31 km WSW 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 44.5753, -110.0525. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Park County, WY | 38 km (23 mi) | ESE | earthquakes near Park County |
| Teton County, WY | 66 km (41 mi) | SSW | earthquakes near Teton County |
| Park County, MT | 106 km (66 mi) | NNW | earthquakes near Park County |
| Carbon County, MT | 108 km (67 mi) | NE | earthquakes near Carbon County |
| Fremont County, ID | 121 km (75 mi) | WSW | earthquakes near Fremont County |
| Teton County, ID | 129 km (80 mi) | SW | earthquakes near Teton County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.9 24 km S of Silver Gate, Montana
- 2.0 24 km SSW of Silver Gate, Montana
- 2.0 37 km S of Silver Gate, Montana
- 3.3 39 km SSE of Mammoth, Wyoming
- 1.7 25 km SE of Mammoth, Wyoming
- 1.9 27 km SE of Mammoth, Wyoming
- 1.8 27 km SE of Mammoth, Wyoming
- 1.7 25 km SE of Mammoth, Wyoming
- 1.9 66 km ESE of West Yellowstone, Montana
- 1.6 68 km ESE of West Yellowstone, Montana
- 1.8 68 km ESE of West Yellowstone, Montana
- 2.4 69 km ESE of West Yellowstone, Montana
- 1.9 68 km ESE of West Yellowstone, Montana
- 2.0 36 km S of Silver Gate, Montana
- 1.9 37 km S of Silver Gate, 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.