Earthquake · reviewed by a seismologist
M 2.3ml
Earthquake near Magna, UT
No earthquake was likely felt in Magna in the 24 hours to 10:07 am MST (17:07 UTC). The last one was M 2.2, 6 km (3 mi) ENE, at 8:46 am MDT on 17 June 2026, estimated intensity II (weak) in town; 28 felt reports to USGS. Every earthquake near Magna
This page: a magnitude 2.3 earthquake was recorded 4 km (3 mi) east of Magna, UT, at 11:18 pm MDT on 9 October 2020 (05:18 UTC), 9.4 km deep. 423 people have reported feeling it to USGS.
USGS: 4 km E of Magna, Utah
in West Valley City, UT
- When
- 11:18 pm MDT on 9 October 2020 ()
- Where
- 4 km (3 mi) east of Magna, UT · earthquakes near Magna
- Magnitude
- M 2.3 (ml)
- Depth
- 9.4 km below the surface
- Felt
- 423 reports · strongest reported intensity III
- Nearest
- Salt Lake County, 12 km ESE
- Nearest mapped fault
- West Valley fault, 5 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 2155 days ago
Earthquake alerts for Magna, UT
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This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. In Magna, 4 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: Magna 4 km, intensity II · West Valley City 5 km, intensity II · Kearns 8 km, intensity II · Taylorsville 11 km, intensity II · Salt Lake City 15 km, intensity II · Murray 15 km, intensity II · West Jordan 15 km, intensity II · Millcreek 15 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
- Magna, Utah 2020 M 5.7 140,000× the energy of this one
- Around the size people start to feel M 3.0 12× the energy of this one
- This earthquake M 2.3 about 77 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
The largest earthquake within 50 km since 2016 was M 5.7 on 2020-03-18 — about 140,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.3 Near Salt Lake City, Utah · 21 km E of this epicentre
- 5.0 1 km NE of Magna, Utah · 3 km WNW 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 40.7120, -112.0540. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Salt Lake County, UT | 12 km (7 mi) | ESE | earthquakes near Salt Lake County |
| Davis County, UT | 38 km (24 mi) | NNW | earthquakes near Davis County |
| Morgan County, UT | 58 km (36 mi) | NE | earthquakes near Morgan County |
| Weber County, UT | 64 km (40 mi) | NNE | earthquakes near Weber County |
| Utah County, UT | 73 km (46 mi) | SSE | earthquakes near Utah County |
| Wasatch County, UT | 86 km (54 mi) | ESE | earthquakes near Wasatch County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.5 4 km NW of Silver Summit, Utah
- 1.7 11 km ESE of Bountiful, Utah
- 1.7 3 km ENE of Magna, Utah
- 2.5 3 km ENE of Magna, Utah
- 1.6 2 km S of North Salt Lake, Utah
- 2.3 Utah
- 1.5 5 km SW of American Fork, Utah
- 1.7 Utah
- 2.9 13 km SSE of Morgan, Utah
- 2.5 14 km N of Summit Park, Utah
- 1.5 8 km SSW of Bingham Canyon, Utah
- 1.6 4 km SW of Bingham Canyon, Utah
- 2.1 3 km ENE of Magna, Utah
- 2.1 5 km NE of Magna, Utah
- 1.7 5 km WSW of Bingham Canyon, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.