QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

Earthquake near Lyman, WY

USGS: 9 km NNE of Lonetree, Wyoming

6:43 pm MDT, May 4, 2020 · · 6.0 km deep · released about 19 lb of TNT

Every earthquake near Lyman Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Uinta County 43 kmDaggett County 56 kmSummit County 79 kmDuchesne County 98 kmRich County 111 kmSweetwater County 117 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
6:43 pm MDT on 4 May 2020 ()
Where
28 km (17 mi) SE of Lyman, WY · earthquakes near Lyman
Magnitude
M 1.9 (ml)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Uinta County, 43 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2342 days ago

A magnitude 1.9 earthquake was recorded 28 km (17 mi) SE of Lyman, WY, at 6:43 pm MDT on 4 May 2020 (00:43 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Mountain View.

How big was it?

This earthquake released about 19 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.

  1. Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
  3. Around the size people start to feel M 3.0 51× the energy of this one
  4. This earthquake M 1.9 about 19 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. 5.2 8 km SE of Little America, Wyoming · 48 km NNE 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 41.1298, -110.0938. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Uinta County, WY 43 km (26 mi) WNW earthquakes near Uinta County
Daggett County, UT 56 km (35 mi) ESE earthquakes near Daggett County
Summit County, UT 79 km (49 mi) WSW earthquakes near Summit County
Duchesne County, UT 98 km (61 mi) SSW earthquakes near Duchesne County
Rich County, UT 111 km (69 mi) WNW earthquakes near Rich County
Sweetwater County, WY 117 km (73 mi) ENE earthquakes near Sweetwater County

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

Aftershocks so far

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

  1. 3.1 2 km WNW of Little America, Wyoming
  2. 2.4 11 km NE of Lyman, Wyoming
  3. 1.6 13 km SSW of Granger, Wyoming
  4. 1.6 14 km SSW of Granger, Wyoming
  5. 2.1 7 km NNW of Robertson, Wyoming
  6. 2.3 9 km WNW of Fort Bridger, Wyoming
  7. 1.9 6 km ESE of Mountain View, Wyoming
  8. 2.1 3 km WSW of Fort Bridger, Wyoming
  9. 1.6 4 km ESE of Little America, Wyoming
  10. 2.0 16 km ESE of Little America, Wyoming
  11. 2.8 16 km SSW of McKinnon, Wyoming
  12. 1.5 21 km SE of Little America, Wyoming
  13. 2.0 20 km S of Lonetree, Wyoming
  14. 1.9 19 km SW of Lonetree, Wyoming
  15. 2.0 14 km NE of Lonetree, 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.