QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

Earthquake near Summit Park, UT

No earthquake was likely felt in Summit Park in the 24 hours to 5:14 am MST (12:14 UTC). The last one was M 2.4, in Summit Park, at 1:30 pm MDT on 17 October 2026, estimated intensity II (weak) in town; 6 felt reports to USGS. Every earthquake near Summit Park

This page: a magnitude 2.8 earthquake was recorded 14 km (9 mi) north-northwest of Summit Park, UT, at 10:30 pm MDT on 23 October 2018 (04:30 UTC), 10 km deep. 282 people have reported feeling it to USGS.

USGS: 14 km NNW of Summit Park, Utah

25 km (15 mi) ENE of Salt Lake City, UT · 24 km (15 mi) NE of Millcreek, UT

10:30 pm MDT, Oct 23, 2018 · · 10 km deep · released about 420 lb of TNT

Every earthquake near Summit Park Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Morgan County 26 kmSalt Lake County 31 kmWeber County 48 kmDavis County 49 kmSummit County 58 kmWasatch County 73 kmUtah County 83 kmRich County 92 kmCache County 97 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
10:30 pm MDT on 23 October 2018 ()
Where
14 km (9 mi) north-northwest of Summit Park, UT · earthquakes near Summit Park
Magnitude
M 2.8 (ml)
Depth
10 km below the surface
Felt
282 reports · strongest reported intensity III
Nearest
Morgan County, 26 km NNE
Nearest mapped fault
Main Canyon fault, 9 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 2864 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 24 km (15 mi) from the epicentre. In Summit Park, 14 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Summit Park 14 km, intensity II · Bountiful 18 km, intensity II · Salt Lake City 23 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 420 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 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 2 earthquakes of M5 or more within 50 km:

  1. 5.3 Near Salt Lake City, Utah · 22 km SSW of this epicentre
  2. 5.0 1 km NE of Magna, Utah · 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 40.8672, -111.6633. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Morgan County, UT 26 km (16 mi) NNE earthquakes near Morgan County
Salt Lake County, UT 31 km (19 mi) SW earthquakes near Salt Lake County
Weber County, UT 48 km (30 mi) NNW earthquakes near Weber County
Davis County, UT 49 km (30 mi) WNW earthquakes near Davis County
Summit County, UT 58 km (36 mi) E earthquakes near Summit County
Wasatch County, UT 73 km (45 mi) SE earthquakes near Wasatch County

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

Aftershocks so far

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

  1. 4.0 4 km NNE of Magna, Utah
  2. 3.9 4 km NNE of Magna, Utah
  3. 5.7 5 km NNE of Magna, Utah
  4. 2.4 21 km ENE of Echo, Utah
  5. 2.1 8 km SSW of Henefer, Utah
  6. 2.0 9 km SSW of Henefer, Utah
  7. 1.9 13 km SW of Echo, Utah
  8. 1.8 2 km WNW of Snyderville, Utah
  9. 2.2 3 km E of Enterprise, Utah
  10. 1.8 5 km ESE of Morgan, Utah
  11. 1.6 5 km ESE of Morgan, Utah
  12. 1.6 5 km ESE of Morgan, Utah
  13. 1.6 21 km N of Henefer, Utah
  14. 1.7 5 km W of Salt Lake City, Utah
  15. 1.8 2 km S of Bluffdale, 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.