M2.4 earthquake 16 km S of Whitehall, Montana
A magnitude 2.4 earthquake struck 16 km S of Whitehall, Montana on Sat, Aug 12, 2017, 3:31 PM MDT (21:31 UTC), 2 km (1 mi) below the surface.
A larger quake followed: M2.6 7 km SSW of Toston, Montana. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.4 (ML, local (Richter)), micro
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-08-12 21:31:00 UTC
- Depth
- 2.2 km (1.4 mi), shallow
- Epicenter
- 45.727° N, 112.109° W
- Region
- Montana
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 2.4 | ML, local (Richter) | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.064 · 32 stations |
| 2.56 | ML, local (Richter) | Montana Bureau of Mines and Geology | Final · ±0.236 · 18 stations |
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 2.0 km horizontally, 9.9 km in depth
- Magnitude uncertainty
- ±0.06
- Depth from
- From location
- Station coverage gap
- 72°
- Stations used
- 25
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 1 in the 30 days before it.
After
- 2.67 km SSW of Toston, Montana · 3336 days ago · 6 km deep · 64 km away · felt by 1
- 1.6Western Montana · 3332 days ago · 6 km deep · 55 km away
- 1.82 km N of Ponderosa Pines, Montana · 3330 days ago · -2 km deep · 68 km away
- 1.56 km W of Ponderosa Pines, Montana · 3313 days ago · 1 km deep · 61 km away
- 1.72 km NE of The Silos, Montana · 3300 days ago · 3 km deep · 86 km away
- 1.77 km W of Helena West Side, Montana · 3293 days ago · 0 km deep · 96 km away
- 1.728 km SSE of Virginia City, Montana · 3284 days ago · 10 km deep · 79 km away
Before
Earthquakes todayMontana earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000a7ss (also filed as mb80244439). Read Mon, Oct 5, 2026, 10:41 AM UTC.