QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

Earthquake near Summit Park, UT

No earthquake was likely felt in Summit Park in the 24 hours to 10:10 am MST (17:10 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 3.3 earthquake was recorded 5 km (3 mi) south of Summit Park, UT, at 11:21 am MDT on 18 September 2017 (17:21 UTC), 11 km deep. 665 people have reported feeling it to USGS.

USGS: 4 km S of Summit Park, Utah

28 km (18 mi) ESE of Salt Lake City, UT · 19 km (12 mi) E of Millcreek, UT

11:21 am MDT, Sep 18, 2017 · · 11 km deep · released about 1.3 tons of TNT

Every earthquake near Summit Park Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salt Lake County 27 kmMorgan County 43 kmWasatch County 56 kmSummit County 57 kmDavis County 62 kmUtah County 65 kmWeber County 67 kmRich County 108 kmUinta County 109 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
11:21 am MDT on 18 September 2017 ()
Where
5 km (3 mi) south of Summit Park, UT · earthquakes near Summit Park
Magnitude
M 3.3 (ml)
Depth
11 km below the surface
Felt
665 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Salt Lake County, 27 km W
Nearest mapped fault
Main Canyon fault, 13 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 2427 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 50 km (31 mi) from the epicentre. In Summit Park, 5 km away, the estimate is intensity III (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 5 km, intensity III · Holladay 19 km, intensity III · Cottonwood Heights 19 km, intensity III · Millcreek 23 km, intensity II · Murray 24 km, intensity II · Salt Lake City 25 km, intensity II · Sandy 26 km, intensity II · Midvale 26 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,300× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.6× more

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 · 16 km W of this epicentre
  2. 5.0 1 km NE of Magna, Utah · 41 km W 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 40.7008, -111.6092. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salt Lake County, UT 27 km (17 mi) W earthquakes near Salt Lake County
Morgan County, UT 43 km (27 mi) N earthquakes near Morgan County
Wasatch County, UT 56 km (35 mi) SE earthquakes near Wasatch County
Summit County, UT 57 km (36 mi) ENE earthquakes near Summit County
Davis County, UT 62 km (39 mi) NW earthquakes near Davis County
Utah County, UT 65 km (40 mi) S earthquakes near Utah County

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

Aftershocks so far

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

  1. 1.6 3 km S of Bingham Canyon, Utah
  2. 1.7 5 km W of Salt Lake City, Utah
  3. 1.9 3 km SSW of Bluffdale, Utah
  4. 2.2 2 km SSW of Bluffdale, Utah
  5. 2.2 3 km SSW of Bluffdale, Utah
  6. 2.3 3 km SSW of Bluffdale, Utah
  7. 1.6 2 km SSE of Bluffdale, Utah
  8. 2.3 2 km S of Bluffdale, Utah
  9. 2.5 2 km S of Bluffdale, Utah
  10. 1.8 2 km S of Bluffdale, Utah
  11. 1.5 2 km S of Bluffdale, Utah
  12. 1.6 1 km SSE of Bluffdale, Utah
  13. 1.6 1 km SSE of Bluffdale, Utah
  14. 1.6 1 km SSE of Bluffdale, Utah
  15. 1.7 1 km SE 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.