mine collapse · reviewed by a seismologist
M 2.8mb_lg
8 km W of North Johns, Alabama
- When
- Magnitude
- M 2.8 (mb_lg)
- Depth
- 1.0 km below the surface
- Felt
- no reports yet
- Nearest
- Tuscaloosa County, 32 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3719 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
USGS catalogues this as mine collapse, not an earthquake.
How big was it?
This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 2× the energy of this one
- This earthquake M 2.8 about 480 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 33.3642, -87.1920. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Tuscaloosa County, AL | 32 km (20 mi) | ENE of here | earthquakes near Tuscaloosa County |
| Jefferson County, AL | 35 km (21 mi) | SW of here | earthquakes near Jefferson County |
| Bibb County, AL | 39 km (24 mi) | N of here | earthquakes near Bibb County |
| Walker County, AL | 49 km (30 mi) | SSE of here | earthquakes near Walker County |
| Shelby County, AL | 51 km (31 mi) | WNW of here | earthquakes near Shelby County |
| Fayette County, AL | 66 km (41 mi) | SE of here | earthquakes near Fayette County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
7 earthquakes have been recorded within 50 km since this one.
- 2.2 15 km W of Rock Creek, Alabama
- 2.1 11 km SSW of Tuscaloosa, Alabama
- 2.5 21 km W of Rock Creek, Alabama
- 2.3 21 km S of Berry, Alabama
- 2.7 22 km S of Oakman, Alabama
- 2.6 16 km S of Oakman, Alabama
- 2.5 20 km S of Oakman, Alabama
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.