Earthquake · reviewed by a seismologist
M 2.3mb_lg
Earthquake near Broken Bow, NE
USGS: 1 km WNW of Arnold, Nebraska
- When
- 12:39 am CDT on 21 June 2018 ()
- Where
- 48 km (30 mi) W of Broken Bow, NE · earthquakes near Broken Bow
- Magnitude
- M 2.3 (mb_lg)
- Depth
- 5.0 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Logan County, 23 km WNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2935 days ago
A magnitude 2.3 earthquake was recorded 48 km (30 mi) W of Broken Bow, NE, at 12:39 am CDT on 21 June 2018 (05:39 UTC). 1 person has reported feeling it to USGS. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 85 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 5.8 180,000× the energy of this one
- Magna, Utah 2020 M 5.7 130,000× the energy of this one
- Around the size people start to feel M 3.0 11× the energy of this one
- This earthquake M 2.3 about 85 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 since 1900 lists no earthquake of M5 or more within 50 km.
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 41.4314, -100.2117. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Logan County, NE | 23 km (14 mi) | WNW | earthquakes near Logan County |
| Custer County, NE | 41 km (25 mi) | E | earthquakes near Custer County |
| Thomas County, NE | 54 km (33 mi) | NNW | earthquakes near Thomas County |
| Blaine County, NE | 58 km (36 mi) | NNE | earthquakes near Blaine County |
| Lincoln County, NE | 61 km (38 mi) | SW | earthquakes near Lincoln County |
| Dawson County, NE | 71 km (44 mi) | SSE | earthquakes near Dawson County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
19 earthquakes have been recorded within 50 km since this one.
- 3.0 10 km S of Arnold, Nebraska
- 2.1 5 km S of Arnold, Nebraska
- 2.6 8 km SE of Arnold, Nebraska
- 2.5 13 km WNW of Callaway, Nebraska
- 2.6 7 km WSW of Arnold, Nebraska
- 2.6 6 km SE of Arnold, Nebraska
- 2.7 4 km E of Arnold, Nebraska
- 3.6 7 km SE of Arnold, Nebraska
- 2.0 4 km SE of Arnold, Nebraska
- 2.8 11 km SE of Arnold, Nebraska
- 2.4 7 km S of Arnold, Nebraska
- 2.4 8 km SSE of Arnold, Nebraska
- 3.6 5 km ESE of Arnold, Nebraska
- 2.7 8 km SE of Arnold, Nebraska
- 3.8 2 km SE of Arnold, Nebraska
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.