mining explosion · reviewed by a seismologist
M 2.5ml
Earthquake near Herriman, UT
No earthquake was likely felt in Herriman in the 24 hours to 10:43 am MST (17:43 UTC). The last one was M 1.6, 10 km (6 mi) W, at 3:23 pm MDT on 16 September 2026, estimated intensity II (weak) in town. Every earthquake near Herriman
No: USGS classifies this as a mining explosion, not an earthquake. A magnitude 2.5 mining explosion was recorded 9 km (6 mi) west-northwest of Herriman, UT, at 1:59 pm MDT on 3 May 2016 (19:59 UTC), less than 1 km deep.
USGS: 1 km S of Bingham Canyon, Utah
13 km (8 mi) WSW of West Jordan, UT · 11 km (7 mi) WNW of Herriman, UT
- When
- 1:59 pm MDT on 3 May 2016 ()
- Where
- 9 km (6 mi) west-northwest of Herriman, UT · earthquakes near Herriman
- Magnitude
- M 2.5 (ml)
- Depth
- 0.0 km below the surface
- Felt
- no reports yet
- Nearest
- Salt Lake County, 23 km NE
- Nearest mapped fault
- Oquirrh fault, 6 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 3769 days ago
Earthquake alerts for Herriman, UT
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 22 km (14 mi) from the epicentre. In Herriman, 9 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: Herriman 9 km, intensity III · Tooele 14 km, intensity II · Riverton 17 km, intensity II · South Jordan 17 km, intensity II · Kearns 18 km, intensity II · West Jordan 18 km, intensity II · Magna 19 km, intensity II · West Valley City 20 km, intensity II. Estimated for each town centre; each link is that town's own record.
USGS catalogues this as mining explosion, not an earthquake.
How big was it?
This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
- Magna, Utah 2020 M 5.7 63,000× the energy of this one
- Around the size people start to feel M 3.0 5.6× the energy of this one
- This earthquake M 2.5 about 170 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:
- 5.3 Near Salt Lake City, Utah · 33 km ENE of this epicentre
- 5.0 1 km NE of Magna, Utah · 20 km N 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 40.5420, -112.1343. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Salt Lake County, UT | 23 km (14 mi) | NE | earthquakes near Salt Lake County |
| Davis County, UT | 55 km (34 mi) | N | earthquakes near Davis County |
| Utah County, UT | 61 km (38 mi) | SE | earthquakes near Utah County |
| Morgan County, UT | 77 km (48 mi) | NE | earthquakes near Morgan County |
| Weber County, UT | 84 km (52 mi) | NNE | earthquakes near Weber County |
| Tooele County, UT | 84 km (52 mi) | W | earthquakes near Tooele County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 2.5 2 km S of Bluffdale, Utah
- 2.2 1 km S of Bluffdale, Utah
- 1.7 0 km S of Bluffdale, Utah
- 1.9 1 km SSW of Bluffdale, Utah
- 1.6 11 km WSW of Vineyard, Utah
- 1.8 2 km S of Bluffdale, Utah
- 1.6 2 km S of Bluffdale, Utah
- 1.6 1 km S of Bluffdale, Utah
- 1.9 1 km S of Bluffdale, Utah
- 1.6 2 km S of Bluffdale, Utah
- 1.8 1 km SSE of Bluffdale, Utah
- 2.4 2 km S of Bluffdale, Utah
- 1.6 2 km SSE of Bluffdale, Utah
- 1.6 2 km SSE of Bluffdale, Utah
- 1.5 2 km SSE 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
- 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.