QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Grantsville, UT

USGS: 20 km NW of Grantsville, Utah

57 km (35 mi) W of Salt Lake City, UT · 50 km (31 mi) W of West Valley City, UT

12:08 am MDT, Oct 30, 2018 · · 5.1 km deep · released about 16 lb of TNT

Every earthquake near Grantsville Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Davis County 46 kmTooele County 54 kmSalt Lake County 58 kmWeber County 84 kmMorgan County 94 kmBox Elder County 104 kmUtah County 106 kmJuab County 116 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
12:08 am MDT on 30 October 2018 ()
Where
21 km (13 mi) NW of Grantsville, UT · earthquakes near Grantsville
Magnitude
M 1.8 (ml)
Depth
5.1 km below the surface
Felt
no reports yet
Nearest
Davis County, 46 km NE
Nearest mapped fault
Skull Valley (mid-valley) faults, 4 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 2894 days ago

A magnitude 1.8 earthquake was recorded 21 km (13 mi) NW of Grantsville, UT, at 12:08 am MDT on 30 October 2018 (06:08 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Stansbury park, Erda.

How big was it?

This earthquake released about 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 1 km NE of Magna, Utah · 44 km E 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 40.7522, -112.6047. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Davis County, UT 46 km (29 mi) NE earthquakes near Davis County
Tooele County, UT 54 km (34 mi) SW earthquakes near Tooele County
Salt Lake County, UT 58 km (36 mi) E earthquakes near Salt Lake County
Weber County, UT 84 km (52 mi) NE earthquakes near Weber County
Morgan County, UT 94 km (58 mi) ENE earthquakes near Morgan County
Box Elder County, UT 104 km (65 mi) NNW earthquakes near Box Elder County

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

Aftershocks so far

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

  1. 3.0 5 km NNE of Magna, Utah
  2. 3.4 2 km NE of Magna, Utah
  3. 3.4 5 km NNE of Magna, Utah
  4. 2.3 6 km NNE of Magna, Utah
  5. 4.6 6 km NNE of Magna, Utah
  6. 1.8 7 km NNE of Magna, Utah
  7. 2.5 1 km NNE of Magna, Utah
  8. 1.7 8 km N of Magna, Utah
  9. 1.6 0 km SE of Magna, Utah
  10. 2.0 5 km NE of Magna, Utah
  11. 1.9 7 km NNE of Magna, Utah
  12. 2.3 1 km ESE of Magna, Utah
  13. 2.2 4 km NE of Magna, Utah
  14. 1.7 Utah
  15. 2.1 5 km NNE of Magna, 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.