Earthquake · reviewed by a seismologist
M 1.7ml
Wyoming
Yes. A magnitude 1.7 earthquake was recorded in Wyoming, at 11:09 pm MDT on 29 August 2020 (05:09 UTC), 4.4 km deep.
- When
- Magnitude
- M 1.7 (ml)
- Depth
- 4.4 km below the surface
- Felt
- no reports yet
- Nearest
- Teton County, 53 km S
- Nearest mapped fault
- Eagle Bay 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 2263 days ago
Earthquake alerts for West Yellowstone, MT
Get a notification in this browser when USGS records an earthquake near West Yellowstone, MT. 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 11 km (7 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 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 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 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 14 km N of Madison Junction, Wyoming · 41 km NW of this epicentre
- 6.3 22 km SW of Mammoth, Wyoming · 43 km NW of this epicentre
- 6.0 21 km E of West Yellowstone, Montana · 30 km WNW of this epicentre
- 5.9 26 km SSE of Mammoth, Wyoming · 26 km NNW of this epicentre
- 5.7 13 km SSW of Mammoth, Wyoming · 43 km NNW 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 44.5267, -110.4972. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Teton County, WY | 53 km (33 mi) | S | earthquakes near Teton County |
| Park County, WY | 72 km (45 mi) | E | earthquakes near Park County |
| Fremont County, ID | 86 km (53 mi) | WSW | earthquakes near Fremont County |
| Teton County, ID | 102 km (64 mi) | SW | earthquakes near Teton County |
| Park County, MT | 104 km (65 mi) | N | earthquakes near Park County |
| Gallatin County, MT | 122 km (76 mi) | NNW | earthquakes near Gallatin 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 28 km S of Mammoth, Wyoming
- 1.7 40 km SSE of West Yellowstone, Montana
- 1.7 41 km SSE of West Yellowstone, Montana
- 1.9 60 km SE of West Yellowstone, Montana
- 2.3 59 km SE of West Yellowstone, Montana
- 1.5 41 km SSE of Mammoth, Wyoming
- 1.5 46 km SE of West Yellowstone, Montana
- 2.5 61 km SE of West Yellowstone, Montana
- 1.7 61 km SE of West Yellowstone, Montana
- 1.9 60 km SE of West Yellowstone, Montana
- 1.5 60 km SE of West Yellowstone, Montana
- 2.0 61 km SE of West Yellowstone, Montana
- 2.3 62 km SE of West Yellowstone, Montana
- 1.5 59 km SE of West Yellowstone, Montana
- 1.9 60 km SE of West Yellowstone, Montana
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.