QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mwr

13 km NNE of Tetonia, Idaho

· 10.0 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Teton County 21 kmFremont County 47 kmMadison County 49 kmTeton County 54 kmBonneville County 73 kmJefferson County 101 kmClark County 110 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 (mwr)
Depth
10.0 km below the surface
Felt
117 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Nearest
Teton County, 21 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 959 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 117 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 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 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 43.9200, -111.0723. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Teton County, ID 21 km (13 mi) NNE of here earthquakes near Teton County
Fremont County, ID 47 km (29 mi) SE of here earthquakes near Fremont County
Madison County, ID 49 km (31 mi) ENE of here earthquakes near Madison County
Teton County, WY 54 km (33 mi) WSW of here earthquakes near Teton County
Bonneville County, ID 73 km (45 mi) NE of here earthquakes near Bonneville County
Jefferson County, ID 101 km (63 mi) E of here earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 1.6 34 km N of Kelly, Wyoming
  2. 1.8 46 km ENE of Warm River, Idaho
  3. 2.2 46 km ENE of Warm River, Idaho
  4. 2.4 45 km ENE of Warm River, Idaho
  5. 1.7 46 km ENE of Warm River, Idaho
  6. 2.7 46 km ENE of Warm River, Idaho
  7. 2.3 46 km ENE of Warm River, Idaho
  8. 1.5 11 km ENE of Alta, Wyoming
  9. 1.7 56 km ENE of Warm River, Idaho
  10. 2.4 6 km ENE of Moose Wilson Road, Wyoming
  11. 1.5 11 km NNE of Alta, Wyoming
  12. 1.9 46 km ENE of Warm River, Idaho
  13. 2.0 45 km ENE of Warm River, Idaho
  14. 2.3 46 km ENE of Warm River, Idaho
  15. 2.4 46 km ENE of Warm River, Idaho

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

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