Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Bozeman, MT
No earthquake was likely felt in Bozeman in the 24 hours to 7:09 am MST (14:09 UTC). The last one was M 3.0, 17 km (10 mi) NW, at 7:42 am MDT on 1 June 2024, estimated intensity II (weak) in town; 20 felt reports to USGS. Every earthquake near Bozeman
This page: a magnitude 1.9 earthquake was recorded 10 km (6 mi) east-southeast of Bozeman, MT, at 1:20 pm MDT on 27 September 2018 (19:20 UTC), 4.3 km deep.
USGS: 10 km ESE of Bozeman, Montana
11 km (7 mi) ESE of Bozeman, MT
- When
- 1:20 pm MDT on 27 September 2018 ()
- Where
- 10 km (6 mi) east-southeast of Bozeman, MT · earthquakes near Bozeman
- Montana today
- every earthquake in Montana in the last 24 hours
- Magnitude
- M 1.9 (ml)
- Depth
- 4.3 km below the surface
- Felt
- no reports yet
- Nearest
- Gallatin County, 24 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2967 days ago
Earthquake alerts for Bozeman, MT
Get a notification in this browser when USGS records an earthquake near Bozeman, 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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. In Bozeman, 10 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.
Likely felt in: Bozeman 10 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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 since 1900 lists no earthquake of M5 or more within 50 km.
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 45.6478, -110.9185. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Gallatin County, MT | 24 km (15 mi) | SW | earthquakes near Gallatin County |
| Park County, MT | 36 km (23 mi) | SE | earthquakes near Park County |
| Sweet Grass County, MT | 78 km (48 mi) | ENE | earthquakes near Sweet Grass County |
| Madison County, MT | 85 km (53 mi) | WSW | earthquakes near Madison County |
| Broadwater County, MT | 88 km (55 mi) | NNW | earthquakes near Broadwater County |
| Jefferson County, MT | 103 km (64 mi) | WNW | earthquakes near Jefferson County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.1 1 km WNW of Manhattan, Montana
- 2.2 1 km WNW of Manhattan, Montana
- 2.3 1 km WNW of Manhattan, Montana
- 1.6 0 km W of Manhattan, Montana
- 1.7 1 km W of Manhattan, Montana
- 2.3 5 km SSE of Logan, Montana
- 1.5 1 km W of Manhattan, Montana
- 1.6 1 km W of Manhattan, Montana
- 2.1 2 km W of Manhattan, Montana
- 1.7 1 km WSW of Manhattan, Montana
- 2.1 2 km W of Manhattan, Montana
- 2.2 1 km W of Manhattan, Montana
- 1.6 2 km WNW of Manhattan, Montana
- 1.7 3 km NW of Manhattan, Montana
- 1.6 1 km WNW of Manhattan, 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.