Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Bald Knob, AR
USGS: 11 km NNW of Bald Knob, Arkansas
100 km (62 mi) NE of Little Rock, AR
- When
- 10:17 pm CDT on 27 July 2022 ()
- Where
- 12 km (7 mi) NNW of Bald Knob, AR · earthquakes near Bald Knob
- Magnitude
- M 2.1 (md)
- Depth
- 4.5 km below the surface
- Felt
- no reports yet
- Nearest
- White County, 19 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1528 days ago
A magnitude 2.1 earthquake was recorded 12 km (7 mi) NNW of Bald Knob, AR, at 10:17 pm CDT on 27 July 2022 (03:17 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Judsonia, Kensett, Searcy, Augusta.
How big was it?
This earthquake released about 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
- Magna, Utah 2020 M 5.7 210,000× the energy of this one
- Around the size people start to feel M 3.0 19× the energy of this one
- This earthquake M 2.1 about 51 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 35.3982, -91.6348. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| White County, AR | 19 km (12 mi) | SW | earthquakes near White County |
| Independence County, AR | 38 km (24 mi) | N | earthquakes near Independence County |
| Cleburne County, AR | 40 km (25 mi) | WNW | earthquakes near Cleburne County |
| Woodruff County, AR | 42 km (26 mi) | ESE | earthquakes near Woodruff County |
| Jackson County, AR | 43 km (27 mi) | ENE | earthquakes near Jackson County |
| Prairie County, AR | 63 km (39 mi) | S | earthquakes near Prairie County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
39 earthquakes have been recorded within 50 km since this one.
- 2.3 13 km SSW of Pleasant Plains, Arkansas
- 2.4 5 km WSW of Southside, Arkansas
- 1.8 3 km NNE of Tumbling Shoals, Arkansas
- 2.0 11 km S of Pleasant Plains, Arkansas
- 2.3 3 km NW of Mount Vernon, Arkansas
- 2.2 11 km SSW of Pleasant Plains, Arkansas
- 1.9 11 km SSW of Pleasant Plains, Arkansas
- 2.2 12 km SSW of Pleasant Plains, Arkansas
- 1.9 11 km SSW of Pleasant Plains, Arkansas
- 1.9 13 km SSW of Pleasant Plains, Arkansas
- 2.1 11 km SW of Pleasant Plains, Arkansas
- 1.7 11 km SSW of Pleasant Plains, Arkansas
- 2.1 12 km SSW of Pleasant Plains, Arkansas
- 2.3 12 km ENE of Pangburn, Arkansas
- 1.7 8 km SW of Heber Springs, Arkansas
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.