Earthquake · reviewed by a seismologist
M 3.0ml
Earthquake near Guernsey, WY
No earthquake was likely felt in Guernsey in the 24 hours to 1:19 am MST (08:19 UTC). The last one was M 2.6, 33 km (21 mi) NNW, at 3:31 am MDT on 28 May 2025, estimated intensity II (weak) in town. Every earthquake near Guernsey
This page: a magnitude 3.0 earthquake was recorded 8 km (5 mi) southwest of Guernsey, WY, at 7:19 am MST on 6 January 2018 (14:19 UTC), 5.0 km deep. 19 people have reported feeling it to USGS.
USGS: 7 km SW of Guernsey, Wyoming
- When
- 7:19 am MST on 6 January 2018 ()
- Where
- 8 km (5 mi) southwest of Guernsey, WY · earthquakes near Guernsey
- Magnitude
- M 3.0 (ml)
- Depth
- 5.0 km below the surface
- Felt
- 19 reports · strongest reported intensity III
- Nearest
- Platte County, 15 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3156 days ago
Earthquake alerts for Guernsey, WY
Get a notification in this browser when USGS records an earthquake near Guernsey, 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 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 73 km (45 mi) from the epicentre. In Guernsey, 8 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.
Earthquakes near other towns within 30 km: Wheatland.
How big was it?
This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 350,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
- Magna, Utah 2020 M 5.7 11,000× the energy of this one
- This earthquake M 3.0 about 950 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 since 1900 lists no earthquake of M5 or more within 50 km.
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 42.2206, -104.8104. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Platte County, WY | 15 km (10 mi) | SW | earthquakes near Platte County |
| Goshen County, WY | 40 km (25 mi) | ESE | earthquakes near Goshen County |
| Sioux County, NE | 93 km (58 mi) | ENE | earthquakes near Sioux County |
| Albany County, WY | 97 km (61 mi) | SW | earthquakes near Albany County |
| Niobrara County, WY | 98 km (61 mi) | NNE | earthquakes near Niobrara County |
| Scotts Bluff County, NE | 100 km (62 mi) | ESE | earthquakes near Scotts Bluff County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
2 earthquakes have been recorded within 50 km since this one.
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.