QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Lyman, WY

USGS: 23 km SSW of Robertson, Wyoming

7:17 pm MDT, May 25, 2018 · · 9.9 km deep · released about 12 lb of TNT

Every earthquake near Lyman Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Uinta County 35 kmSummit County 42 kmDuchesne County 77 kmDaggett County 83 kmWasatch County 91 kmMorgan County 92 kmRich County 96 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
7:17 pm MDT on 25 May 2018 ()
Where
42 km (26 mi) SSW of Lyman, WY · earthquakes near Lyman
Magnitude
M 1.7 (ml)
Depth
9.9 km below the surface
Felt
no reports yet
Nearest
Uinta County, 35 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3048 days ago

A magnitude 1.7 earthquake was recorded 42 km (26 mi) SSW of Lyman, WY, at 7:17 pm MDT on 25 May 2018 (01:17 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 12 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.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 40.9772, -110.4895. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Uinta County, WY 35 km (22 mi) N earthquakes near Uinta County
Summit County, UT 42 km (26 mi) WSW earthquakes near Summit County
Duchesne County, UT 77 km (48 mi) S earthquakes near Duchesne County
Daggett County, UT 83 km (52 mi) E earthquakes near Daggett County
Wasatch County, UT 91 km (57 mi) SW earthquakes near Wasatch County
Morgan County, UT 92 km (57 mi) W earthquakes near Morgan County

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

Aftershocks so far

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

  1. 1.6 24 km SE of Evanston, Wyoming
  2. 1.9 42 km SSE of Evanston, Wyoming
  3. 2.0 42 km SSE of Evanston, Wyoming
  4. 2.2 42 km SSE of Evanston, Wyoming
  5. 2.2 42 km SSE of Evanston, Wyoming
  6. 1.6 43 km NE of Samak, Utah
  7. 2.5 28 km NNW of Tabiona, Utah
  8. 2.1 42 km ENE of Oakley, Utah
  9. 2.7 41 km ENE of Oakley, Utah
  10. 2.2 42 km ENE of Oakley, Utah
  11. 1.9 41 km SSE of Evanston, Wyoming
  12. 3.0 41 km SSE of Evanston, Wyoming
  13. 2.0 43 km NE of Samak, Utah
  14. 1.6 42 km NE of Samak, Utah
  15. 2.0 42 km ENE of Oakley, Utah

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.