QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

56 km S of Ten Sleep, Wyoming

Yes. A magnitude 3.2 earthquake was recorded 56 km S of Ten Sleep, Wyoming, at 12:24 pm MDT on 31 October 2017 (18:24 UTC), 15 km deep.

· 15 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washakie County 43 kmHot Springs County 82 kmNatrona County 82 kmJohnson County 91 kmFremont County 107 kmBig Horn County 120 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 3.2 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Washakie County, 43 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3214 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 44 km (27 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 43.5212, -107.4570. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Washakie County, WY 43 km (27 mi) NNW earthquakes near Washakie County
Hot Springs County, WY 82 km (51 mi) WNW earthquakes near Hot Springs County
Natrona County, WY 82 km (51 mi) SE earthquakes near Natrona County
Johnson County, WY 91 km (56 mi) NE earthquakes near Johnson County
Fremont County, WY 107 km (66 mi) WSW earthquakes near Fremont County
Big Horn County, WY 120 km (74 mi) NNW earthquakes near Big Horn County

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

Aftershocks so far

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

  1. 2.6 17 km ESE of Lucerne, Wyoming
  2. 2.6 10 km SSE of Ten Sleep, Wyoming
  3. 3.7 Wyoming
  4. 2.3 56 km ESE of East Thermopolis, Wyoming
  5. 2.6 28 km SSE of Ten Sleep, Wyoming
  6. 3.6 43 km S of Ten Sleep, Wyoming
  7. 3.9 51 km S of Ten Sleep, Wyoming
  8. 2.8 30 km SSW of Ten Sleep, Wyoming
  9. 2.3 28 km NE of Shoshoni, Wyoming
  10. 2.4 24 km E of Shoshoni, Wyoming
  11. 2.4 33 km ENE of Shoshoni, Wyoming
  12. 2.9 57 km S of Ten Sleep, Wyoming
  13. 2.5 52 km S of Ten Sleep, Wyoming
  14. 4.0 57 km S of Ten Sleep, 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.