Earthquake · reviewed by a seismologist
M 1.9ml
26 km ESE of Shelby, Montana
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 5.7 km below the surface
- Felt
- no reports yet
- Nearest
- Toole County, 31 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3187 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
- Magna, Utah 2020 M 5.7 520,000× the energy of this one
- Around the size people start to feel M 3.0 46× the energy of this one
- This earthquake M 1.9 about 21 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 48.4012, -111.5293. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Toole County, MT | 31 km (19 mi) | SSE of here | earthquakes near Toole County |
| Liberty County, MT | 40 km (25 mi) | WSW of here | earthquakes near Liberty County |
| Pondera County, MT | 55 km (34 mi) | ENE of here | earthquakes near Pondera County |
| Teton County, MT | 86 km (53 mi) | NE of here | earthquakes near Teton County |
| Chouteau County, MT | 99 km (62 mi) | NW of here | earthquakes near Chouteau County |
| Hill County, MT | 108 km (67 mi) | WSW of here | earthquakes near Hill County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 1.7 27 km ESE of Shelby, Montana
- 1.7 24 km WSW of Chester, Montana
- 1.8 Eastern Montana
- 1.9 24 km ESE of Shelby, 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.