Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Afton, WY
No earthquake was likely felt in Afton in the 24 hours to 6:34 am MST (13:34 UTC). The last one was M 2.3, 14 km (9 mi) W, at 3:44 pm MDT on 19 May 2026, estimated intensity II (weak) in town. Every earthquake near Afton
This page: a magnitude 1.9 earthquake was recorded 33 km (21 mi) east of Afton, WY, at 2:14 pm MDT on 30 May 2019 (20:14 UTC), 12 km deep.
USGS: 33 km E of Afton, Wyoming
- When
- 2:14 pm MDT on 30 May 2019 ()
- Where
- 33 km (21 mi) east of Afton, WY · earthquakes near Afton
- Magnitude
- M 1.9 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Sublette County, 50 km E
- Nearest mapped fault
- Greys River fault, 11 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 2717 days ago
Earthquake alerts for Afton, WY
Get a notification in this browser when USGS records an earthquake near Afton, WY. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 10 km (6 mi) from the epicentre. In Afton, 33 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.
How big was it?
This earthquake released about 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
- Magna, Utah 2020 M 5.7 450,000× the energy of this one
- Around the size people start to feel M 3.0 40× the energy of this one
- This earthquake M 1.9 about 24 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.8 4 km SSE of Auburn, Wyoming · 37 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 42.7362, -110.5257. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sublette County, WY | 50 km (31 mi) | E | earthquakes near Sublette County |
| Lincoln County, WY | 58 km (36 mi) | SSW | earthquakes near Lincoln County |
| Bear Lake County, ID | 83 km (51 mi) | SW | earthquakes near Bear Lake County |
| Caribou County, ID | 83 km (52 mi) | W | earthquakes near Caribou County |
| Bonneville County, ID | 115 km (72 mi) | NW | earthquakes near Bonneville County |
| Franklin County, ID | 123 km (77 mi) | WSW | earthquakes near Franklin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
37 earthquakes have been recorded within 50 km since this one.
- 2.6 5 km NNE of Star Valley Ranch, Wyoming
- 2.3 3 km NNE of Star Valley Ranch, Wyoming
- 2.8 5 km NE of Star Valley Ranch, Wyoming
- 2.0 16 km ENE of Etna, Wyoming
- 2.3 4 km WSW of Thayne, Wyoming
- 2.3 17 km NE of Star Valley Ranch, Wyoming
- 2.8 15 km NE of Star Valley Ranch, Wyoming
- 2.7 6 km E of Etna, Wyoming
- 2.5 8 km E of Star Valley Ranch, Wyoming
- 2.6 10 km S of Bondurant, Wyoming
- 1.6 18 km NE of Star Valley Ranch, Wyoming
- 1.5 18 km ENE of Star Valley Ranch, Wyoming
- 1.8 14 km SSE of Bondurant, Wyoming
- 2.0 19 km ENE of Star Valley Ranch, Wyoming
- 2.8 18 km NE of Star Valley Ranch, 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
- 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.