28 Sept 2025, 07:38 UTC · Sep 28, 3:38 AM ET

M3.1 earthquake 22 km SSW of Mammoth, Wyoming

A magnitude 3.1 earthquake struck 22 km SSW of Mammoth, Wyoming at Sep 28, 3:38 AM ET, 8 km deep, minor – felt by people near the epicenter. 1 people reported feeling it.

M2.7 57 km NE of Kelly, WyomingM2.7 48 km NE of Spencer, IdahoM2.7 33 km E of West Yellowstone, MontanaM2.7 23 km SSW of Mammoth, WyomingM2.8 3 km ESE of Hebgen Lake Estates, MontanaM2.9 30 km W of Hebgen Lake Estates, MontanaM3.1 23 km SSW of Mammoth, WyomingM3.1 22 km SSW of Mammoth, WyomingM3.2 22 km SSW of Mammoth, WyomingM3.3 22 km SSW of Mammoth, WyomingM3.3 39 km SSE of Mammoth, WyomingM3.4 57 km NE of Kelly, WyomingM3.7 22 km SSW of Mammoth, Wyoming
under 33–44–55–66+
Magnitude3.1 ml
Time28 Sept 2025, 07:38 UTC
Location44.802°, -110.855° – 22 km SSW of Mammoth, Wyoming
Depth7.8 km
Felt reports1
USGS eventuu80118201
Within 100 km

Other earthquakes nearby this year

Mag.WhereWhen (ET)DepthFelt
3.722 km SSW of Mammoth, WyomingOct 28, 9:22 AM
353 d ago
7 km11 reports
3.457 km NE of Kelly, WyomingSep 7, 12:25 AM
40 d ago
7 km–
3.339 km SSE of Mammoth, WyomingJul 16, 9:20 AM
92 d ago
7 km28 reports
3.322 km SSW of Mammoth, WyomingSep 28, 3:29 AM
384 d ago
8 km1 report
3.222 km SSW of Mammoth, WyomingNov 9, 7:00 PM
341 d ago
8 km–
3.123 km SSW of Mammoth, WyomingNov 8, 10:04 AM
342 d ago
7 km3 reports
2.930 km W of Hebgen Lake Estates, MontanaApr 4, 10:26 PM
195 d ago
10 km2 reports
2.83 km ESE of Hebgen Lake Estates, MontanaSep 8, 3:21 AM
39 d ago
11 km–
2.723 km SSW of Mammoth, WyomingOct 9, 12:06 AM
373 d ago
8 km1 report
2.733 km E of West Yellowstone, MontanaDec 31, 3:44 PM
289 d ago
7 km–
2.748 km NE of Spencer, IdahoJul 1, 7:44 PM
107 d ago
10 km–
2.757 km NE of Kelly, WyomingSep 7, 3:43 AM
40 d ago
7 km–
FAQ

About this earthquake

How strong was the 22 km SSW of Mammoth, Wyoming earthquake?

Magnitude 3.1 (ml), minor – felt by people near the epicenter. Depth 8 km.

Was it felt?

1 people reported feeling it to the USGS "Did You Feel It?" survey; the highest reported intensity was 2.7.

Were there aftershocks?

1 earthquakes within 100 km in the following two weeks are in our records, the strongest M2.7.

Earthquakes

More

Source: U.S. Geological Survey (USGS) earthquake catalog, real-time feeds and FDSN event service; magnitudes and locations are revised by seismologists for hours after an event. Times are Eastern (ET) unless marked UTC. Not an alert service: for warnings follow local authorities and tsunami centers.

Cookies

We measure traffic so we know which stories you care about. You can change your choice at any time.

M3.1 earthquake 22 km SSW of Mammoth, Wyoming — 77.today