QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Evanston, WY

USGS: 31 km SSE of Evanston, Wyoming

95 km (59 mi) ENE of Salt Lake City, UT

7:23 pm MDT, Aug 28, 2017 · · 21 km deep · released about 15 lb of TNT

Every earthquake near Evanston Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Summit County 18 kmUinta County 39 kmMorgan County 63 kmRich County 77 kmWasatch County 79 kmDuchesne County 87 kmWeber County 92 kmSalt Lake County 98 kmCache County 111 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
7:23 pm MDT on 28 August 2017 ()
Where
31 km (19 mi) SSE of Evanston, WY · earthquakes near Evanston
Magnitude
M 1.8 (ml)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Summit County, 18 km SW
Nearest mapped fault
Bear River fault, 1 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3321 days ago

A magnitude 1.8 earthquake was recorded 31 km (19 mi) SSE of Evanston, WY, at 7:23 pm MDT on 28 August 2017 (01:23 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 41.0042, -110.8412. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Summit County, UT 18 km (11 mi) SW earthquakes near Summit County
Uinta County, WY 39 km (24 mi) NE earthquakes near Uinta County
Morgan County, UT 63 km (39 mi) W earthquakes near Morgan County
Rich County, UT 77 km (48 mi) NNW earthquakes near Rich County
Wasatch County, UT 79 km (49 mi) SSW earthquakes near Wasatch County
Duchesne County, UT 87 km (54 mi) SSE earthquakes near Duchesne County

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

Aftershocks so far

46 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.