M3.7 earthquake 22 km SSW of Mammoth, Wyoming
A magnitude 3.7 earthquake struck 22 km SSW of Mammoth, Wyoming at Oct 28, 9:22 AM ET, 7 km deep, minor – felt by people near the epicenter. 11 people reported feeling it.
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| Magnitude | 3.7 ml |
| Time | 28 Oct 2025, 13:22 UTC |
| Location | 44.802°, -110.845° – 22 km SSW of Mammoth, Wyoming |
| Depth | 7.2 km |
| Felt reports | 11 |
| Max. estimated intensity (MMI) | 4.3 |
| USGS event | uu80120481 |
Other earthquakes nearby this year
| Mag. | Where | When (ET) | Depth | Felt |
|---|---|---|---|---|
| 3.4 | 57 km NE of Kelly, Wyoming | Sep 7, 12:25 AM 40 d ago | 7 km | – |
| 3.3 | 39 km SSE of Mammoth, Wyoming | Jul 16, 9:20 AM 92 d ago | 7 km | 28 reports |
| 3.3 | 22 km SSW of Mammoth, Wyoming | Sep 28, 3:29 AM 384 d ago | 8 km | 1 report |
| 3.2 | 22 km SSW of Mammoth, Wyoming | Nov 9, 7:00 PM 341 d ago | 8 km | – |
| 3.1 | 22 km SSW of Mammoth, Wyoming | Sep 28, 3:38 AM 384 d ago | 8 km | 1 report |
| 3.1 | 23 km SSW of Mammoth, Wyoming | Nov 8, 10:04 AM 342 d ago | 7 km | 3 reports |
| 2.9 | 30 km W of Hebgen Lake Estates, Montana | Apr 4, 10:26 PM 195 d ago | 10 km | 2 reports |
| 2.8 | 3 km ESE of Hebgen Lake Estates, Montana | Sep 8, 3:21 AM 39 d ago | 11 km | – |
| 2.7 | 23 km SSW of Mammoth, Wyoming | Oct 9, 12:06 AM 373 d ago | 8 km | 1 report |
| 2.7 | 33 km E of West Yellowstone, Montana | Dec 31, 3:44 PM 289 d ago | 7 km | – |
| 2.7 | 48 km NE of Spencer, Idaho | Jul 1, 7:44 PM 107 d ago | 10 km | – |
| 2.7 | 57 km NE of Kelly, Wyoming | Sep 7, 3:43 AM 40 d ago | 7 km | – |
About this earthquake
How strong was the 22 km SSW of Mammoth, Wyoming earthquake?
Magnitude 3.7 (ml), minor – felt by people near the epicenter. Depth 7 km. Strongest estimated shaking: intensity 4.3 on the Modified Mercalli scale.
Was it felt?
11 people reported feeling it to the USGS "Did You Feel It?" survey; the highest reported intensity was 3.1.
Were there aftershocks?
2 earthquakes within 100 km in the following two weeks are in our records, the strongest M3.2.
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.