Earthquake · reviewed by a seismologist
M 3.9ml
Earthquake near Logan, UT
No earthquake was likely felt in Logan in the 24 hours to 5:23 pm MST (00:23 UTC). The last one was M 2.6, 16 km (10 mi) ESE, at 6:52 am MDT on 25 June 2026, estimated intensity II (weak) in town; 19 felt reports to USGS. Every earthquake near Logan
This page: a magnitude 3.9 earthquake was recorded 47 km (29 mi) west of Logan, UT, at 10:15 am MDT on 24 September 2019 (16:15 UTC), 6.6 km deep. 183 people have reported feeling it to USGS.
USGS: 5 km ENE of Howell, Utah
46 km (29 mi) W of Logan, UT · 122 km (76 mi) NNW of Salt Lake City, UT
- When
- 10:15 am MDT on 24 September 2019 ()
- Where
- 47 km (29 mi) west of Logan, UT · earthquakes near Logan
- Magnitude
- M 3.9 (ml)
- Depth
- 6.6 km below the surface
- Felt
- 183 reports · strongest reported intensity III
- Measured shaking
- intensity V (ShakeMap)
- Nearest
- Oneida County, 42 km NNW
- Nearest mapped fault
- North Promontory fault, 14 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 2016 days ago
Earthquake alerts for Logan, UT
Get a notification in this browser when USGS records an earthquake near Logan, UT. No account or email needed.
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 88 km (55 mi) from the epicentre. In Logan, 47 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: Tremonton 22 km, intensity III · Brigham City 46 km, intensity II · Logan 47 km, intensity II · North Logan 49 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 10 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 16,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 730× the energy of this one
- Magna, Utah 2020 M 5.7 520× the energy of this one
- This earthquake M 3.9 about 10 tons of TNT
- Around the size people start to feel M 3.0 this one released 22× 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 8 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 The 1934 Hansel Valley, Utah Earthquake · 38 km WSW of this epicentre
- 6.1 17 km NE of Snowville, Utah · 30 km NNW of this epicentre
- 5.9 35 km SSW of Howell, Utah · 40 km SW of this epicentre
- 5.6 Hansel Valley, Utah · 26 km W of this epicentre
- 5.2 27 km SW of Thatcher, Utah · 36 km SSW 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 41.8157, -112.3897. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Oneida County, ID | 42 km (26 mi) | NNW | earthquakes near Oneida County |
| Cache County, UT | 54 km (34 mi) | E | earthquakes near Cache County |
| Box Elder County, UT | 60 km (37 mi) | WSW | earthquakes near Box Elder County |
| Franklin County, ID | 61 km (38 mi) | NE | earthquakes near Franklin County |
| Weber County, UT | 74 km (46 mi) | SE | earthquakes near Weber County |
| Davis County, UT | 88 km (55 mi) | S | earthquakes near Davis County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 1.8 12 km S of Snowville, Utah
- 2.5 7 km SE of Howell, Utah
- 1.6 20 km WSW of Corinne, Utah
- 1.9 19 km SSW of Thatcher, Utah
- 1.6 12 km ESE of Snowville, Utah
- 2.0 12 km ESE of Snowville, Utah
- 1.5 13 km ESE of Snowville, Utah
- 1.8 11 km ENE of Snowville, Utah
- 2.1 13 km S of Snowville, Utah
- 2.8 13 km S of Snowville, Utah
- 1.5 33 km SSW of Snowville, Utah
- 1.7 12 km SE of Snowville, Utah
- 1.5 20 km WSW of Corinne, Utah
- 1.6 20 km WSW of Corinne, Utah
- 1.8 11 km SSE of Snowville, 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.