Earthquake · reviewed by a seismologist
M 2.0ml
32 km ENE of Helena Valley Northeast, Montana
- When
- Magnitude
- M 2.0 (ml)
- Depth
- 16 km below the surface
- Felt
- no reports yet
- Nearest
- Broadwater County, 56 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 66 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 36 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 420,000× the energy of this one
- Magna, Utah 2020 M 5.7 300,000× the energy of this one
- Around the size people start to feel M 3.0 27× the energy of this one
- This earthquake M 2.0 about 36 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 46.8278, -111.5727. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Broadwater County, MT | 56 km (35 mi) | N of here | earthquakes near Broadwater County |
| Meagher County, MT | 56 km (35 mi) | WNW of here | earthquakes near Meagher County |
| Cascade County, MT | 57 km (35 mi) | SSW of here | earthquakes near Cascade County |
| Lewis and Clark County, MT | 70 km (43 mi) | ESE of here | earthquakes near Lewis and Clark County |
| Jefferson County, MT | 87 km (54 mi) | NNE of here | earthquakes near Jefferson County |
| Judith Basin County, MT | 99 km (61 mi) | WSW of here | earthquakes near Judith Basin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
5 earthquakes have been recorded within 50 km since this one.
- 1.5 16 km NE of Helena Valley Northwest, Montana
- 1.6 14 km SSE of Craig, Montana
- 2.4 21 km SSE of Craig, Montana
- 1.5 1 km SSE of South Hills, Montana
- 1.7 0 km NNW of South Hills, 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.