Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Kalispell, MT
USGS: 13 km E of Martin City, Montana
- When
- 6:25 pm MST on 10 February 2018 ()
- Where
- 41 km (25 mi) ENE of Kalispell, MT · earthquakes near Kalispell
- Magnitude
- M 1.8 (ml)
- Depth
- 8.5 km below the surface
- Felt
- no reports yet
- Nearest
- Flathead County, 18 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3155 days ago
A magnitude 1.8 earthquake was recorded 41 km (25 mi) ENE of Kalispell, MT, at 6:25 pm MST on 10 February 2018 (01:25 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Columbia Falls.
How big was it?
This earthquake released about 14 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 5.7 760,000× the energy of this one
- Around the size people start to feel M 3.0 68× the energy of this one
- This earthquake M 1.8 about 14 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.5 Western Montana · 44 km S 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 48.3975, -113.8555. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Flathead County, MT | 18 km (11 mi) | SW | earthquakes near Flathead County |
| Glacier County, MT | 72 km (45 mi) | ENE | earthquakes near Glacier County |
| Lake County, MT | 86 km (53 mi) | SSW | earthquakes near Lake County |
| Lincoln County, MT | 120 km (74 mi) | W | earthquakes near Lincoln County |
| Sanders County, MT | 122 km (76 mi) | SW | earthquakes near Sanders County |
| Teton County, MT | 133 km (83 mi) | ESE | earthquakes near Teton County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
27 earthquakes have been recorded within 50 km since this one.
- 2.0 5 km SSW of West Glacier, Montana
- 1.8 12 km NE of Forest Hill Village, Montana
- 1.9 12 km ESE of Evergreen, Montana
- 1.7 1 km S of Woods Bay, Montana
- 1.7 30 km ESE of Martin City, Montana
- 2.3 10 km NNW of Swan Lake, Montana
- 1.7 15 km NNE of Bigfork, Montana
- 1.7 5 km ESE of Lakeside, Montana
- 1.5 8 km ESE of Woods Bay, Montana
- 1.6 3 km NNE of Somers, Montana
- 2.0 1 km ENE of Columbia Falls, Montana
- 1.6 Western Montana
- 2.1 8 km NNW of Bigfork, Montana
- 2.1 16 km NNE of Swan Lake, Montana
- 1.7 3 km E of Forest Hill Village, 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.