Earthquake near Star Valley Ranch, WY

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 27 km (17 mi) from the epicentre. In Star Valley Ranch, 16 km away, the estimate is intensity II (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 16 km, intensity II · Hoback 24 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
3. Around the size people start to feel M 3.0 2× the energy of this one
4. This earthquake M 2.8 about 480 lb of TNT

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 4.8 on 2016-08-27 — 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 · 36 km SSW of this epicentre Feb 3, 1994
2. 5.3 Southeastern Idaho · 40 km W of this epicentre Dec 12, 1917
3. 5.3 29 km WSW of Freedom, Idaho · 50 km WSW of this epicentre Apr 21, 2001

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 43.0639, -110.8105. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.2 1 km E of Alpine Northeast, Wyoming 06:08 UTC
2. 2.9 23 km WNW of Auburn, Wyoming 09:17 UTC
3. 2.2 23 km ESE of Jackson, Wyoming 06:08 UTC
4. 2.3 22 km ESE of Jackson, Wyoming 17:34 UTC
5. 2.1 23 km ESE of Jackson, Wyoming 08:54 UTC
6. 2.0 23 km ESE of Jackson, Wyoming 08:46 UTC
7. 2.4 17 km WSW of Auburn, Wyoming 12:09 UTC
8. 2.3 10 km SW of Auburn, Wyoming 21:44 UTC
9. 2.0 3 km NE of Hoback, Wyoming 05:11 UTC
10. 1.8 19 km SW of Freedom, Idaho 22:02 UTC
11. 1.8 17 km WSW of Auburn, Wyoming 07:46 UTC
12. 1.7 18 km WSW of Auburn, Wyoming 00:51 UTC
13. 2.6 5 km NNE of Star Valley Ranch, Wyoming 18:15 UTC
14. 2.9 15 km WSW of Freedom, Idaho 06:48 UTC
15. 2.0 13 km E of Irwin, Idaho 22:22 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:15 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

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