Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Logan, UT
No earthquake was likely felt in Logan in the 24 hours to 3:55 pm MST (22:55 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 1.9 earthquake was recorded 48 km (30 mi) west-northwest of Logan, UT, at 4:29 pm MDT on 30 August 2023 (22:29 UTC), 8.4 km deep.
USGS: 7 km NE of Howell, Utah
47 km (29 mi) WNW of Logan, UT · 125 km (78 mi) NNW of Salt Lake City, UT
- When
- 4:29 pm MDT on 30 August 2023 ()
- Where
- 48 km (30 mi) west-northwest of Logan, UT · earthquakes near Logan
- Magnitude
- M 1.9 (ml)
- Depth
- 8.4 km below the surface
- Felt
- no reports yet
- Nearest
- Oneida County, 39 km NNW
- Nearest mapped fault
- North Promontory 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 1168 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 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 12 km (7 mi) from the epicentre. In Logan, 48 km away, the estimate is intensity I (not felt). 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.
Earthquakes near other towns within 30 km: Garland, Tremonton, Elwood.
How big was it?
This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
- Magna, Utah 2020 M 5.7 560,000× the energy of this one
- Around the size people start to feel M 3.0 50× the energy of this one
- This earthquake M 1.9 about 19 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 8 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 The 1934 Hansel Valley, Utah Earthquake · 39 km WSW of this epicentre
- 6.1 17 km NE of Snowville, Utah · 27 km NNW of this epicentre
- 5.9 35 km SSW of Howell, Utah · 43 km SW of this epicentre
- 5.6 Hansel Valley, Utah · 26 km WSW of this epicentre
- 5.2 27 km SW of Thatcher, Utah · 40 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 41.8478, -112.3943. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Oneida County, ID | 39 km (24 mi) | NNW | earthquakes near Oneida County |
| Cache County, UT | 55 km (34 mi) | ESE | earthquakes near Cache County |
| Franklin County, ID | 60 km (37 mi) | NE | earthquakes near Franklin County |
| Box Elder County, UT | 61 km (38 mi) | WSW | earthquakes near Box Elder County |
| Weber County, UT | 77 km (48 mi) | SE | earthquakes near Weber County |
| Davis County, UT | 92 km (57 mi) | S | earthquakes near Davis County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.6 15 km SW of Thatcher, Utah
- 2.8 16 km SW of Thatcher, Utah
- 2.0 15 km SW of Thatcher, Utah
- 2.0 16 km SW of Thatcher, Utah
- 1.6 15 km SW of Thatcher, Utah
- 1.8 14 km SW of Thatcher, Utah
- 2.2 15 km SW of Thatcher, Utah
- 3.1 15 km SW of Thatcher, Utah
- 1.8 15 km SW of Thatcher, Utah
- 1.7 15 km SW of Thatcher, Utah
- 1.9 16 km SW of Thatcher, Utah
- 2.0 15 km SW of Thatcher, Utah
- 2.0 16 km SW of Thatcher, Utah
- 1.8 15 km SW of Thatcher, Utah
- 2.0 15 km SW of Thatcher, 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.