Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Conway, AR
USGS: 2 km WNW of Enola, Arkansas
55 km (34 mi) NNE of Little Rock, AR · 27 km (17 mi) ENE of Conway, AR
- When
- 1:44 am CDT on 28 September 2021 ()
- Where
- 24 km (15 mi) ENE of Conway, AR · earthquakes near Conway
- Magnitude
- M 1.9 (md)
- Depth
- 6.4 km below the surface
- Felt
- no reports yet
- Nearest
- Faulkner County, 12 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1831 days ago
A magnitude 1.9 earthquake was recorded 24 km (15 mi) ENE of Conway, AR, at 1:44 am CDT on 28 September 2021 (06:44 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Vilonia, Greenbrier.
How big was it?
This earthquake released about 24 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 5.8 640,000× the energy of this one
- Magna, Utah 2020 M 5.7 450,000× the energy of this one
- Around the size people start to feel M 3.0 40× the energy of this one
- This earthquake M 1.9 about 24 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 35.2067, -92.2238. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Faulkner County, AR | 12 km (8 mi) | WSW | earthquakes near Faulkner County |
| Conway County, AR | 43 km (27 mi) | W | earthquakes near Conway County |
| White County, AR | 43 km (27 mi) | E | earthquakes near White County |
| Cleburne County, AR | 47 km (29 mi) | NNE | earthquakes near Cleburne County |
| Pulaski County, AR | 49 km (31 mi) | S | earthquakes near Pulaski County |
| Van Buren County, AR | 50 km (31 mi) | NNW | earthquakes near Van Buren County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
22 earthquakes have been recorded within 50 km since this one.
- 2.1 3 km E of Enola, Arkansas
- 1.8 3 km NNE of Tumbling Shoals, Arkansas
- 2.3 3 km NW of Mount Vernon, Arkansas
- 1.7 8 km SW of Heber Springs, Arkansas
- 2.3 3 km NE of Greenbrier, Arkansas
- 2.0 3 km SSE of Guy, Arkansas
- 2.3 9 km NW of Judsonia, Arkansas
- 1.8 2 km WNW of Enola, Arkansas
- 2.2 10 km WSW of Center Ridge, Arkansas
- 1.9 5 km W of Damascus, Arkansas
- 2.1 5 km NNE of Greenbrier, Arkansas
- 2.0 Arkansas
- 2.3 6 km ESE of Center Ridge, Arkansas
- 1.7 1 km ENE of Enola, Arkansas
- 1.6 3 km WNW of Greenbrier, 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.