QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9ml

22 km SSW of Mammoth, Wyoming

· 11 km deep · released about 12 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 78 kmFremont County 83 kmGallatin County 86 kmTeton County 88 kmPark County 102 kmMadison County 105 kmTeton County 119 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 3.9 (ml)
Depth
11 km below the surface
Felt
29 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Park County, 78 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1401 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 29 people have reported feeling it to USGS.

How big was it?

This earthquake released about 12 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 14,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 640× the energy of this one
  3. Magna, Utah 2020 M 5.7 450× the energy of this one
  4. This earthquake M 3.9 about 12 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 25× more

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 44.7892, -110.8097. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, MT 78 km (48 mi) SSW of here earthquakes near Park County
Fremont County, ID 83 km (52 mi) NE of here earthquakes near Fremont County
Gallatin County, MT 86 km (53 mi) SSE of here earthquakes near Gallatin County
Teton County, WY 88 km (55 mi) NNW of here earthquakes near Teton County
Park County, WY 102 km (63 mi) WNW of here earthquakes near Park County
Madison County, MT 105 km (65 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

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

  1. 1.5 22 km SSW of Mammoth, Wyoming
  2. 2.2 22 km SSW of Mammoth, Wyoming
  3. 2.4 22 km SSW of Mammoth, Wyoming
  4. 1.6 42 km SSE of Mammoth, Wyoming
  5. 2.3 34 km ESE of West Yellowstone, Montana
  6. 2.5 34 km ESE of West Yellowstone, Montana
  7. 1.8 34 km ESE of West Yellowstone, Montana
  8. 1.6 33 km ESE of West Yellowstone, Montana
  9. 2.2 34 km ESE of West Yellowstone, Montana
  10. 2.1 7 km ESE of Hebgen Lake Estates, Montana
  11. 1.6 6 km ESE of Hebgen Lake Estates, Montana
  12. 2.8 6 km ESE of Hebgen Lake Estates, Montana
  13. 1.5 23 km SSW of Mammoth, Wyoming
  14. 2.0 22 km SSW of Mammoth, Wyoming
  15. 2.6 23 km SSW of Mammoth, Wyoming

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 4.4 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.