QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

Earthquake near Star Valley Ranch, WY

No earthquake was likely felt in Star Valley Ranch in the 24 hours to 11:46 pm MST (06:46 UTC). The last one was M 3.8, 75 km (47 mi) SSW, at 5:05 am MDT on 15 May 2026, estimated intensity II (weak) in town; 29 felt reports to USGS. Every earthquake near Star Valley Ranch

This page: a magnitude 3.3 earthquake was recorded 7 km (5 mi) west of Star Valley Ranch, WY, at 7:13 pm MDT on 2 September 2017 (01:13 UTC), 10 km deep.

USGS: 2 km S of Freedom, Idaho

7:13 pm MDT, Sep 2, 2017 · · 10 km deep · released about 1.3 tons of TNT

Every earthquake near Star Valley Ranch Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Caribou County 45 kmBonneville County 67 kmBear Lake County 79 kmLincoln County 87 kmTeton County 90 kmSublette County 95 kmBannock County 101 kmMadison County 104 kmFranklin County 108 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
7:13 pm MDT on 2 September 2017 ()
Where
7 km (5 mi) west of Star Valley Ranch, WY · earthquakes near Star Valley Ranch
Idaho today
every earthquake in Idaho in the last 24 hours
Magnitude
M 3.3 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Caribou County, 45 km WSW
Nearest mapped fault
Grand Valley fault, 8 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3262 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 51 km (32 mi) from the epicentre. In Star Valley Ranch, 7 km away, the estimate is intensity III (weak). 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.

Likely felt in: Star Valley Ranch 7 km, intensity III · Hoback 41 km, intensity II · Conda 47 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× 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

The largest earthquake within 50 km since 2016 was M 5.3 on 2017-09-02 — about 1,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 4 km SSE of Auburn, Wyoming · 23 km SSE of this epicentre
  2. 5.3 Southeastern Idaho · 21 km W of this epicentre
  3. 5.3 29 km WSW of Freedom, Idaho · 29 km W of this epicentre

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 42.9634, -111.0462. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Caribou County, ID 45 km (28 mi) WSW earthquakes near Caribou County
Bonneville County, ID 67 km (42 mi) NW earthquakes near Bonneville County
Bear Lake County, ID 79 km (49 mi) SSW earthquakes near Bear Lake County
Lincoln County, WY 87 km (54 mi) SSE earthquakes near Lincoln County
Teton County, ID 90 km (56 mi) N earthquakes near Teton County
Sublette County, WY 95 km (59 mi) ESE earthquakes near Sublette 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. 2.4 13 km E of Soda Springs, Idaho
  2. 2.6 10 km ENE of Soda Springs, Idaho
  3. 3.2 8 km ENE of Soda Springs, Idaho
  4. 3.0 11 km E of Soda Springs, Idaho
  5. 2.2 11 km E of Soda Springs, Idaho
  6. 4.0 10 km E of Soda Springs, Idaho
  7. 2.7 12 km E of Soda Springs, Idaho
  8. 1.9 12 km E of Soda Springs, Idaho
  9. 2.4 10 km NE of Soda Springs, Idaho
  10. 3.7 12 km E of Soda Springs, Idaho
  11. 2.8 12 km E of Soda Springs, Idaho
  12. 2.4 11 km E of Soda Springs, Idaho
  13. 3.3 9 km E of Soda Springs, Idaho
  14. 3.0 9 km E of Soda Springs, Idaho
  15. 2.9 12 km E of Soda Springs, 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

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