Earthquake · reviewed by a seismologist
M 2.2ml
45 km ENE of Roy, Montana
- When
- Magnitude
- M 2.2 (ml)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Petroleum County, 43 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3516 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 58 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 260,000× the energy of this one
- Magna, Utah 2020 M 5.7 180,000× the energy of this one
- Around the size people start to feel M 3.0 16× the energy of this one
- This earthquake M 2.2 about 58 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.
Where
Epicentre 47.5070, -108.4172. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Petroleum County, MT | 43 km (27 mi) | NNW of here | earthquakes near Petroleum County |
| Fergus County, MT | 69 km (43 mi) | ENE of here | earthquakes near Fergus County |
| Phillips County, MT | 90 km (56 mi) | SSW of here | earthquakes near Phillips County |
| Garfield County, MT | 110 km (69 mi) | WNW of here | earthquakes near Garfield County |
| Blaine County, MT | 110 km (69 mi) | SSE of here | earthquakes near Blaine County |
| Musselshell County, MT | 111 km (69 mi) | N of here | earthquakes near Musselshell County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have been recorded within 50 km since this one.
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.