Earthquake · reviewed by a seismologist
M 2.2md
13 km SW of Alpena, Arkansas
- When
- Magnitude
- M 2.2 (md)
- Depth
- 4.2 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Carroll County, 22 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1434 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 62 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 240,000× the energy of this one
- Magna, Utah 2020 M 5.7 170,000× the energy of this one
- Around the size people start to feel M 3.0 15× the energy of this one
- This earthquake M 2.2 about 62 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.
Where
Epicentre 36.1833, -93.3832. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Carroll County, AR | 22 km (14 mi) | SE of here | earthquakes near Carroll County |
| Boone County, AR | 30 km (19 mi) | WSW of here | earthquakes near Boone County |
| Newton County, AR | 34 km (21 mi) | NNW of here | earthquakes near Newton County |
| Madison County, AR | 36 km (22 mi) | ENE of here | earthquakes near Madison County |
| Taney County, MO | 60 km (37 mi) | SSW of here | earthquakes near Taney County |
| Stone County, MO | 63 km (39 mi) | S of here | earthquakes near Stone County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
2 earthquakes have been recorded within 50 km since this one.
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.