Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Bigfork, MT
No earthquake was likely felt in Bigfork in the 24 hours to 8:31 am MST (15:31 UTC). The last one was M 1.7, 8 km (5 mi) SSE, at 5:52 pm MST on 5 December 2024, estimated intensity II (weak) in town. Every earthquake near Bigfork
This page: a magnitude 2.5 earthquake was recorded 44 km (27 mi) east-southeast of Bigfork, MT, at 10:54 am MDT on 23 June 2024 (16:54 UTC), 10 km deep.
USGS: 24 km E of Swan Lake, Montana
- When
- 10:54 am MDT on 23 June 2024 ()
- Where
- 44 km (27 mi) east-southeast of Bigfork, MT · earthquakes near Bigfork
- Montana today
- every earthquake in Montana in the last 24 hours
- Magnitude
- M 2.5 (ml)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 53 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 803 days ago
Earthquake alerts for Bigfork, MT
Get a notification in this browser when USGS records an earthquake near Bigfork, MT. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Bigfork, 44 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
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 · 23 km WNW 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 47.9219, -113.5167. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, MT | 53 km (33 mi) | SW | earthquakes near Lake County |
| Flathead County, MT | 57 km (36 mi) | NW | earthquakes near Flathead County |
| Teton County, MT | 93 km (58 mi) | E | earthquakes near Teton County |
| Glacier County, MT | 95 km (59 mi) | NNE | earthquakes near Glacier County |
| Pondera County, MT | 102 km (63 mi) | ENE | earthquakes near Pondera County |
| Missoula County, MT | 103 km (64 mi) | SSW | earthquakes near Missoula County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
19 earthquakes have been recorded within 50 km since this one.
- 1.4 4 km NE of Bear Dance, Montana
- 1.8 3 km NE of Bear Dance, Montana
- 1.1 2 km E of Bear Dance, Montana
- -0.0 19 km E of Finley Point, Montana
- 2.4 9 km SSW of Bear Dance, Montana
- 1.8 17 km SSE of Swan Lake, Montana
- 1.6 40 km ENE of Condon, Montana
- 2.0 15 km ENE of Ronan, Montana
- 1.7 20 km E of Finley Point, Montana
- 1.6 20 km E of Finley Point, Montana
- 1.6 20 km E of Finley Point, Montana
- 2.1 20 km E of Finley Point, Montana
- 1.8 17 km E of Condon, Montana
- 1.7 19 km E of Finley Point, Montana
- 1.6 16 km NNE of Condon, 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.