Earthquake · reviewed by a seismologist
M 1.9ml
36 km NE of Bondurant, Wyoming
Yes. A magnitude 1.9 earthquake was recorded 36 km NE of Bondurant, Wyoming, at 9:40 am MDT on 25 September 2021 (15:40 UTC), 6.0 km deep.
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 6.0 km below the surface
- Felt
- no reports yet
- Nearest
- Sublette County, 72 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1874 days ago
Earthquake alerts for Jackson, WY
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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 13 km (8 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 20 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 5.8 760,000× the energy of this one
- Magna, Utah 2020 M 5.7 540,000× the energy of this one
- Around the size people start to feel M 3.0 48× the energy of this one
- This earthquake M 1.9 about 20 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 24,000 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 20 km ESE of Kelly, Wyoming · 32 km NW 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 43.4050, -110.0608. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sublette County, WY | 72 km (45 mi) | S | earthquakes near Sublette County |
| Teton County, WY | 77 km (48 mi) | NNW | earthquakes near Teton County |
| Teton County, ID | 101 km (63 mi) | WNW | earthquakes near Teton County |
| Fremont County, WY | 124 km (77 mi) | ESE | earthquakes near Fremont County |
| Caribou County, ID | 139 km (86 mi) | WSW | earthquakes near Caribou County |
| Fremont County, ID | 146 km (91 mi) | NW | earthquakes near Fremont County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 2.0 14 km ESE of Kelly, Wyoming
- 1.7 15 km ESE of Kelly, Wyoming
- 1.8 21 km ESE of Kelly, Wyoming
- 1.6 18 km ESE of Kelly, Wyoming
- 1.9 24 km NNW of Cora, Wyoming
- 1.6 20 km SE of Kelly, Wyoming
- 2.5 26 km NNE of Bondurant, Wyoming
- 2.9 13 km ESE of Kelly, Wyoming
- 2.6 10 km S of Bondurant, Wyoming
- 2.5 23 km ESE of Kelly, Wyoming
- 1.9 9 km E of Kelly, Wyoming
- 1.8 22 km E of Kelly, Wyoming
- 1.8 14 km SSE of Bondurant, Wyoming
- 1.7 Wyoming
- 1.7 6 km NW of Bondurant, 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.