Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Evergreen, MT
USGS: 9 km NE of Evergreen, Montana
- When
- 4:10 am MST on 9 February 2018 ()
- Where
- 10 km (6 mi) NE of Evergreen, MT · earthquakes near Evergreen
- Magnitude
- M 2.5 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Flathead County, 9 km E
- Nearest mapped fault
- Mission fault, 15 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3157 days ago
A magnitude 2.5 earthquake was recorded 10 km (6 mi) NE of Evergreen, MT, at 4:10 am MST on 9 February 2018 (11:10 UTC). This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
Earthquakes near other towns within 30 km: Columbia Falls, Kalispell, Whitefish, Somers, Bigfork, Lakeside.
How big was it?
This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
- Magna, Utah 2020 M 5.7 63,000× the energy of this one
- Around the size people start to feel M 3.0 5.6× the energy of this one
- This earthquake M 2.5 about 170 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 · 42 km SE 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 48.2828, -114.1785. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Flathead County, MT | 9 km (6 mi) | E | earthquakes near Flathead County |
| Lake County, MT | 72 km (44 mi) | S | earthquakes near Lake County |
| Sanders County, MT | 95 km (59 mi) | SW | earthquakes near Sanders County |
| Glacier County, MT | 99 km (62 mi) | ENE | earthquakes near Glacier County |
| Lincoln County, MT | 99 km (62 mi) | WNW | earthquakes near Lincoln County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.8 12 km NE of Forest Hill Village, Montana
- 1.9 12 km ESE of Evergreen, Montana
- 1.6 6 km SW of Woods Bay, Montana
- 1.7 1 km S of Woods Bay, Montana
- 2.1 6 km SW of Woods Bay, Montana
- 1.6 6 km SW of Woods Bay, Montana
- 2.2 7 km WNW of Lake Mary Ronan, Montana
- 1.7 7 km WNW of Lake Mary Ronan, Montana
- 1.8 6 km WNW of Lake Mary Ronan, Montana
- 1.7 30 km ESE of Martin City, Montana
- 2.3 6 km NNE of Olney, 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
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.