QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

23 km SSW of Mammoth, Wyoming

· 5.1 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 79 kmFremont County 82 kmTeton County 86 kmGallatin County 87 kmPark County 101 kmMadison County 107 kmTeton County 117 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.8 (ml)
Depth
5.1 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Park County, 79 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1436 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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.

Where

Epicentre 44.7743, -110.8037. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 79 km (49 mi) SSW of here earthquakes near Park County
Fremont County, ID 82 km (51 mi) NE of here earthquakes near Fremont County
Teton County, WY 86 km (53 mi) NNW of here earthquakes near Teton County
Gallatin County, MT 87 km (54 mi) SSE of here earthquakes near Gallatin County
Park County, WY 101 km (63 mi) WNW of here earthquakes near Park County
Madison County, MT 107 km (66 mi) SE of here earthquakes near Madison County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

60 earthquakes have been recorded within 50 km since this one.

  1. 2.0 24 km SE of Mammoth, Wyoming
  2. 2.5 21 km SSW of Mammoth, Wyoming
  3. 2.9 21 km SSW of Mammoth, Wyoming
  4. 1.5 47 km SE of Mammoth, Wyoming
  5. 2.0 50 km SSE of Mammoth, Wyoming
  6. 1.8 49 km SSE of Mammoth, Wyoming
  7. 1.7 49 km SSE of Mammoth, Wyoming
  8. 1.8 50 km SSE of Mammoth, Wyoming
  9. 1.6 49 km SSE of Mammoth, Wyoming
  10. 1.9 49 km SSE of Mammoth, Wyoming
  11. 1.5 50 km SSE of Mammoth, Wyoming
  12. 2.0 23 km SSW of Mammoth, Wyoming
  13. 1.8 41 km SSE of West Yellowstone, Montana
  14. 1.6 34 km ESE of West Yellowstone, Montana
  15. 1.9 35 km ESE of West Yellowstone, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2017-06-16 — it released about 220 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.