Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Rock Springs, WY
USGS: 20 km SW of Eden, Wyoming
- When
- 8:35 am MST on 30 November 2018 ()
- Where
- 49 km (31 mi) NW of Rock Springs, WY · earthquakes near Rock Springs
- Magnitude
- M 1.9 (md)
- Depth
- 15 km below the surface
- Felt
- no reports yet
- Nearest
- Sweetwater County, 67 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2858 days ago
A magnitude 1.9 earthquake was recorded 49 km (31 mi) NW of Rock Springs, WY, at 8:35 am MST on 30 November 2018 (15:35 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 600,000× the energy of this one
- Magna, Utah 2020 M 5.7 420,000× the energy of this one
- Around the size people start to feel M 3.0 38× the energy of this one
- This earthquake M 1.9 about 25 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:
- 5.2 8 km SE of Little America, Wyoming · 49 km SSW 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 41.9138, -109.6025. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sweetwater County, WY | 67 km (41 mi) | ESE | earthquakes near Sweetwater County |
| Lincoln County, WY | 96 km (60 mi) | WNW | earthquakes near Lincoln County |
| Sublette County, WY | 98 km (61 mi) | NNW | earthquakes near Sublette County |
| Uinta County, WY | 106 km (66 mi) | SW | earthquakes near Uinta County |
| Daggett County, UT | 114 km (71 mi) | S | earthquakes near Daggett County |
| Summit County, UT | 162 km (101 mi) | SW | earthquakes near Summit County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 3.3 2 km NW of Little America, Wyoming
- 3.2 2 km NW of Little America, Wyoming
- 3.5 1 km NW of Little America, Wyoming
- 3.2 2 km WNW of Little America, Wyoming
- 3.2 2 km WNW of Little America, Wyoming
- 3.3 1 km NW of Little America, Wyoming
- 2.9 3 km WNW of Little America, Wyoming
- 3.1 1 km NNW of Little America, Wyoming
- 3.1 2 km WNW of Little America, Wyoming
- 2.9 15 km NNE of Granger, Wyoming
- 2.7 17 km NNE of Granger, Wyoming
- 3.0 4 km NNW of Little America, Wyoming
- 3.7 4 km NW of Little America, Wyoming
- 2.2 3 km N of Little America, Wyoming
- 3.5 3 km NNW of Little America, 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.