M1.6 earthquake 5 km SSW of Alpine, Wyoming
A magnitude 1.6 earthquake struck 5 km SSW of Alpine, Wyoming on Wed, Jul 28, 2021, 9:41 PM MDT (03:41 UTC), 1 km (1 mi) below the surface.
A larger quake followed: M2.4 17 km WSW of Georgetown, Idaho. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (ML, local (Richter)), micro
- Magnitude from
- Montana Bureau of Mines and Geology
- Local time
- UTC
- 2021-07-29 03:41:14 UTC
- Depth
- 1.4 km (0.9 mi), shallow
- Epicenter
- 43.118° N, 111.031° W
- Region
- Wyoming
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
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 0.9 km horizontally, 6.4 km in depth
- Magnitude uncertainty
- ±0.20
- Depth from
- From location
- Station coverage gap
- 82°
- Stations used
- 15
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 6 in the 30 days before it.
After
- 1.7southern Idaho · 1885 days ago · 10 km deep · 44 km away
- 1.91 km E of Alpine Northeast, Wyoming · 1881 days ago · 6 km deep · 9 km away
- 1.514 km NE of Kelly, Wyoming · 1881 days ago · 6 km deep · 80 km away
- 2.417 km WSW of Georgetown, Idaho · 1866 days ago · 5 km deep · 88 km away
- 1.816 km WSW of Georgetown, Idaho · 1866 days ago · 4 km deep · 86 km away
- 2.019 km NE of Georgetown, Idaho · 1853 days ago · -3 km deep · 60 km away
- 2.17 km SSE of Hoback, Wyoming · 1844 days ago · 6 km deep · 25 km away
- 2.316 km WSW of Auburn, Wyoming · 1840 days ago · 7 km deep · 44 km away
- 1.936 km NE of Bondurant, Wyoming · 1835 days ago · 6 km deep · 85 km away
Before
- 1.932 km ESE of Kelly, Wyoming · 1899 days ago · 4 km deep · 77 km away
- 1.78 km W of Bennington, Idaho · 1909 days ago · 6 km deep · 87 km away
- 1.923 km NE of Kelly, Wyoming · 1911 days ago · 6 km deep · 88 km away
- 1.75 km NW of Georgetown, Idaho · 1912 days ago · 1 km deep · 74 km away
- 1.87 km WNW of Georgetown, Idaho · 1915 days ago · 5 km deep · 76 km away
- 2.76 km S of Alpine, Wyoming · 1922 days ago · 5 km deep · 2 km away · felt by 15
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event mb80517399. Read Sun, Oct 4, 2026, 9:01 AM UTC.