QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2ml

36 km S of Silver Gate, Montana

· 14 km deep · released about 32 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 38 kmTeton County 78 kmPark County 97 kmCarbon County 97 kmStillwater 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 4.2 (ml)
Depth
14 km below the surface
Felt
57 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Park County, 38 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1528 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 57 people have reported feeling it to USGS.

How big was it?

This earthquake released about 32 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 5,200× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 230× the energy of this one
  3. Magna, Utah 2020 M 5.7 170× the energy of this one
  4. This earthquake M 4.2 about 32 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 68× 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 44.6810, -109.9963. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, WY 38 km (24 mi) WNW of here earthquakes near Park County
Teton County, WY 78 km (49 mi) NNE of here earthquakes near Teton County
Park County, MT 97 km (60 mi) SSE of here earthquakes near Park County
Carbon County, MT 97 km (60 mi) SW of here earthquakes near Carbon County
Stillwater County, MT 119 km (74 mi) SSW of here earthquakes near Stillwater County
Fremont County, ID 129 km (80 mi) ENE of here earthquakes near Fremont 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. 2.8 58 km SSE of Mammoth, Wyoming
  2. 2.2 Wyoming
  3. 1.5 58 km SSE of Mammoth, Wyoming
  4. 2.1 58 km SSE of Mammoth, Wyoming
  5. 2.7 57 km SSE of Mammoth, Wyoming
  6. 2.7 57 km SSE of Mammoth, Wyoming
  7. 2.8 57 km SSE of Mammoth, Wyoming
  8. 2.7 56 km SSE of Mammoth, Wyoming
  9. 2.6 Wyoming
  10. 2.5 57 km SSE of Mammoth, Wyoming
  11. 2.3 57 km SSE of Mammoth, Wyoming
  12. 3.1 Wyoming
  13. 2.5 57 km SSE of Mammoth, Wyoming
  14. 1.6 Wyoming
  15. 2.2 57 km SSE 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.

On USGS

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