QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

Earthquake near Lander, WY

USGS: 29 km ENE of Atlantic City, Wyoming

9:15 pm MST, Dec 2, 2018 · · 5.0 km deep · released about 340 lb of TNT

Every earthquake near Lander Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 51 kmSweetwater County 114 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
9:15 pm MST on 2 December 2018 ()
Where
35 km (22 mi) SE of Lander, WY · earthquakes near Lander
Magnitude
M 2.7 (ml)
Depth
5.0 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Fremont County, 51 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2785 days ago

A magnitude 2.7 earthquake was recorded 35 km (22 mi) SE of Lander, WY, at 9:15 pm MST on 2 December 2018 (04:15 UTC). 1 person has reported feeling it to USGS. This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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:

  1. 5.0 10 km W of Atlantic City, Wyoming · 39 km WSW 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 42.6237, -108.4092. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fremont County, WY 51 km (31 mi) NNW earthquakes near Fremont County
Sweetwater County, WY 114 km (71 mi) SSW earthquakes near Sweetwater County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

7 earthquakes have been recorded within 50 km since this one.

  1. 3.8 29 km E of Atlantic City, Wyoming
  2. 2.5 29 km ENE of Atlantic City, Wyoming
  3. 2.6 37 km SE of Riverton, Wyoming
  4. 2.7 32 km E of Atlantic City, Wyoming
  5. 2.5 14 km W of Atlantic City, Wyoming
  6. 2.7 35 km ENE of Atlantic City, Wyoming
  7. 2.6 27 km NW of Jeffrey City, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.