Earthquake · reviewed by a seismologist
M 1.8ml
33 km NW of Lima, Montana
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 7.9 km below the surface
- Felt
- no reports yet
- Nearest
- Beaverhead County, 34 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 403 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 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 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 810,000× the energy of this one
- Around the size people start to feel M 3.0 72× 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.
Where
Epicentre 44.8273, -112.9237. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Beaverhead County, MT | 34 km (21 mi) | S of here | earthquakes near Beaverhead County |
| Clark County, ID | 75 km (46 mi) | NW of here | earthquakes near Clark County |
| Lemhi County, ID | 77 km (48 mi) | E of here | earthquakes near Lemhi County |
| Madison County, MT | 97 km (60 mi) | SW of here | earthquakes near Madison County |
| Silver Bow County, MT | 121 km (75 mi) | S of here | earthquakes near Silver Bow County |
| Custer County, ID | 122 km (76 mi) | ENE of here | earthquakes near Custer County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
12 earthquakes have been recorded within 50 km since this one.
- 3.3 18 km S of Lima, Montana
- 2.1 26 km SE of Dillon, Montana
- 1.7 2 km SW of Lima, Montana
- 3.2 18 km N of Leadore, Idaho
- 2.8 19 km NE of Lima, Montana
- 2.1 2 km SSE of Lima, Montana
- 1.8 27 km SW of Dillon, Montana
- 1.6 19 km NW of Lima, Montana
- 1.9 11 km ESE of Lima, Montana
- 1.6 16 km SSW of Dillon, Montana
- 1.7 33 km NW of Lima, Montana
- 1.8 34 km NW of Lima, 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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.6 on 2019-04-09 — it released about 18,000 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.